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Unit 1: Life Around Us • Class 5 EVS (New NEP 2020)
Chapter 1: Water — The Essence of Life
Exploring water states, the global water cycle, groundwater aquifers, traditional stepwells, and conservation
Chapter Highlights, Environmental Insights & Scientific Ideas
- States of Water: Exists naturally in three interconnected physical states—solid (ice/snow), liquid (water), and gas (water vapour).
- The Water Cycle: Solar heat powers continuous evaporation from water bodies and transpiration from plants, followed by atmospheric condensation into clouds and precipitation as rain or snow.
- Groundwater & Surface Water: Surface water fills lakes, ponds, and rivers; rainwater seeps through permeable soil layers into underground aquifers (water table) accessed via wells and borewells.
- Traditional Indian Water Architecture: Ancient engineering structures like Bawris (stepwells in Rajasthan/Gujarat), Johads (earthen check dams), Kunds, and Tankas preserved precious desert rainwater for centuries.
- Water Scarcity & Pollution: Untreated sewage, industrial discharge, and unchecked chemical runoff severely deplete freshwater sources, causing seasonal droughts.
- Rainwater Harvesting (RWH): Capturing rooftop rainwater and filtering it directly into recharging pits or underground cisterns ensures sustainable water security.
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
What are the three physical states of water found on Earth, and how does water transition between them in nature?
Conceptual Understanding
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Water exists in three distinct states:
- Liquid State: Common water found in rivers, oceans, lakes, and rain.
- Solid State: Ice, snow, and glaciers formed when water cools below 0°C.
- Gaseous State: Invisible water vapour produced when water evaporates due to heat.
CBSE Step-by-Step Marking Scheme
Correct identification of 3 states (solid, liquid, gas)
1.5 Marks
Explanation of heating (evaporation) and cooling (condensation)
1.5 Marks
Q2
How does groundwater differ from surface water? Explain how rainwater seeps down to form underground aquifers.
Scientific Explanation
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Difference:
- Surface Water: Water visible on Earth's surface in ponds, streams, rivers, and reservoirs, readily exposed to sunlight and direct atmospheric pollution.
- Groundwater: Water located beneath Earth's surface inside pores of soil, gravel, and rock formations known as aquifers.
CBSE Step-by-Step Marking Scheme
Clear distinction between surface and groundwater
1.5 Marks
Accurate description of infiltration through porous soil
1.5 Marks
Q3
What are 'Bawris' (stepwells)? Explain their historical, social, and architectural importance in arid regions like Rajasthan and Gujarat.
Cultural & Environmental Heritage
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
A Bawri is a traditional Indian stepwell—a multi-storeyed, intricately carved underground reservoir with flight of stone steps descending deep into the water level.
Key Importance:
Key Importance:
- Rainwater Harvesting in Arid Climates: In desert regions receiving sparse, erratic rainfall, Bawris collected monsoon runoff, ensuring year-round drinking and cooking water.
- Cool Community Gathering Spaces: Deep subterranean stone pavilions provided a naturally cool refuge from searing desert heat where travelers, merchants, and villagers rested and socialized.
- Architectural Masterpieces: Examples like Rani ki Vav in Gujarat and Chand Baori in Abhaneri (Rajasthan) feature stunning geometry, stone pillars, and cooling subterranean galleries.
CBSE Step-by-Step Marking Scheme
Definition of Bawri as stepwell with stone stairways
1 Mark
Role in water harvesting during drought seasons
1.5 Marks
Social and cooling architectural functions
1.5 Marks
Q4
Hands-on Activity: Describe an experiment using a glass tumbler, warm water, and ice cubes to demonstrate condensation.
Hands-on Experiment & Observation
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Experiment: Simulating Cloud Formation and Condensation
- Materials Needed: A transparent glass tumbler, warm water (about half-full), a small metal lid or saucer, and 3–4 ice cubes.
- Procedure:
- Pour warm water into the transparent glass tumbler until it is half full.
- Cover the mouth of the tumbler immediately with the metal saucer.
- Place several ice cubes on top of the metal saucer.
- Observe the underside of the saucer and the upper walls of the glass tumbler for 2–3 minutes.
- Observation: Warm water evaporates, producing invisible water vapour that rises inside the tumbler. When this warm vapour touches the cold metal plate chilled by ice cubes, it loses thermal energy, and tiny drops of liquid water condense on the underside of the saucer, eventually dripping down like raindrops.
- Scientific Conclusion: Condensation occurs whenever warm water vapour cools down and transforms back into liquid droplets.
CBSE Step-by-Step Marking Scheme
List of materials and clear 4-step procedure
1.5 Marks
Accurate observation of droplets on cold underside
1.5 Marks
Scientific principle of condensation articulated
1 Mark
Q5
Household Water Audit Task: How much water does an average family of four consume daily? Prepare a conservation checklist.
Field Investigation & Conservation
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Daily Water Consumption Audit (Family of 4):
5-Point Water Conservation Checklist:
| Activity | Estimated Litres/Day |
|---|---|
| Drinking & Cooking | 25 L |
| Bathing (bucket vs shower) | 120 L |
| Toilet Flushing | 100 L |
| Washing Clothes & Utensils | 95 L |
| Floor Cleaning & Plants | 30 L |
| Total Estimated Usage | 370 Litres / day |
- Turn off taps while brushing teeth and soaping hands (saves ~12 litres daily).
- Use a bucket and mug for bathing instead of continuous high-flow showers.
- Fix leaking faucets and pipe joints promptly—a single dripping tap can waste up to 15 litres daily.
- Reuse rinse water from washing vegetables and pulses to water potted plants.
- Wash vehicles using a wet cloth and bucket rather than running a garden hose.
CBSE Step-by-Step Marking Scheme
Realistic itemized audit table for family of 4
2 Marks
Five practical, age-appropriate conservation habits
2 Marks
Q6
Why is water referred to as the 'Universal Solvent'? Name three common kitchen substances that dissolve in water and two that do not.
Properties of Matter
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Water is known as the Universal Solvent because it can dissolve more chemical substances and compounds than any other liquid on Earth due to its unique molecular polarity.
Substances that dissolve in water (Soluble):
Substances that dissolve in water (Soluble):
- Table Salt (Sodium Chloride)
- Sugar (Sucrose)
- Lemon juice / Honey
- Cooking oil / Mustard oil (floats on surface because it is non-polar and less dense)
- Sand / Chalk powder (settles at the bottom as sediment)
CBSE Step-by-Step Marking Scheme
Reason for universal solvent designation
1 Mark
Three accurate soluble examples
1 Mark
Two accurate insoluble examples with observation
1 Mark
Q7
[Textbook Activity & Question 1] In 'Water — The Essence of Life', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Water — The Essence of Life
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 2] In 'Water — The Essence of Life', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Water — The Essence of Life
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 3] In 'Water — The Essence of Life', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Water — The Essence of Life
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 4] In 'Water — The Essence of Life', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Water — The Essence of Life
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 5] In 'Water — The Essence of Life', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Water — The Essence of Life
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 6] In 'Water — The Essence of Life', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Water — The Essence of Life
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 7] In 'Water — The Essence of Life', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Water — The Essence of Life
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 8] In 'Water — The Essence of Life', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Water — The Essence of Life
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 9] In 'Water — The Essence of Life', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Water — The Essence of Life
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 10] In 'Water — The Essence of Life', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Water — The Essence of Life
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 11] In 'Water — The Essence of Life', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Water — The Essence of Life
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 12] In 'Water — The Essence of Life', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Water — The Essence of Life
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 13] In 'Water — The Essence of Life', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Water — The Essence of Life
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 14] In 'Water — The Essence of Life', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Water — The Essence of Life
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 15] In 'Water — The Essence of Life', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Water — The Essence of Life
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 16] In 'Water — The Essence of Life', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Water — The Essence of Life
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Water — The Essence of Life, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
Rooftop Rainwater Harvesting for Climate-Resilient Schools
Case Scenario: A government primary school in a rural district experiences severe groundwater depletion by March each year, leaving the school handpump dry and forcing students to carry water from distant wells.
Analytical Task: Design a simple, cost-effective Rooftop Rainwater Harvesting (RRWH) model that the school Eco-Club can implement. Outline the primary components and explain how this will secure drinking water and recharge local aquifers.
Proposed School Rooftop Rainwater Harvesting Framework:
- Catchment Area (Rooftop): The clean sloping roof of the school building serves as the catchment surface where fresh monsoon rain falls. Regular cleaning of the roof before monsoons prevents leaf and dust contamination.
- Conveyance Pipes (Gutters & Downspouts): PVC gutters fitted along the roof edges channel collected rainwater into downpipes.
- First-Flush Device: A simple valve drains away the first 15–20 minutes of monsoon rain, washing away atmospheric dust and bird droppings.
- Multi-layered Filtration Pit: Water then passes through a natural filter chamber containing layers of coarse gravel, fine sand, and charcoal, which remove suspended particles and impurities.
- Storage Tank & Percolation Well: The filtered water is stored in an underground masonry tank for washing and toilets, while the overflow is directed into a soak-pit to recharge the school's dried groundwater aquifer.
CBSE Assessment Rubric: 2 Marks for identifying the 5 key structural components (catchment, gutters, first-flush, filter, storage) + 3 Marks for operational explanation and ecological aquifer recharge impact = 5 Marks
2
Unit 1: Life Around Us • Class 5 EVS (New NEP 2020)
Chapter 2: Journey of a River
Following river courses from snowy glacial sources down fertile plains to ocean deltas, studying ecosystems and river conservation
Chapter Highlights, Environmental Insights & Scientific Ideas
- River Course Stages: A river journeys across three distinct stages—Upper Course (steep mountain origin, rapid flow, V-shaped valleys, waterfalls), Middle Course (gentle gradient, meanders, wide valleys, human settlements), and Lower Course (slow flow, sediment deposition, delta formation, meeting the sea).
- Perennial vs Seasonal Rivers: Perennial rivers (Ganga, Yamuna, Brahmaputra) are fed year-round by melting Himalayan glaciers and monsoons; seasonal rivers (Godavari, Krishna, Narmada) rely primarily on monsoon rainfall.
- River Ecosystems: Rivers provide freshwater habitats for fish, freshwater turtles, aquatic plants, and endangered species like the Gangetic Dolphin (*Platanista gangetica*).
- Historical & Agricultural Importance: River floodplains deposit nutrient-rich alluvial silt, creating India's most fertile agricultural belts that supported ancient civilizations.
- River Pollution Drivers: Municipal untreated sewage, industrial chemical effluents, washing clothes with synthetic detergents, and plastic trash threaten river health.
- Conservation Programs: Initiatives like the Namami Gange Project, constructing Sewage Treatment Plants (STPs), and community riverbank tree planting (riparian buffers) help restore river cleanliness.
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
Trace the three distinct stages of a river from its mountain source to the sea. How does the river's speed and shape change?
Physical Geography
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
A river journeys through three distinct geographical stages:
- The Upper Course (Mountain Stage): The river originates high in mountains from melting glaciers or rain-fed springs. The terrain is steep, causing the river to flow rapidly with high erosive power, cutting steep V-shaped valleys and cascading down waterfalls.
- The Middle Course (Valley & Plains Stage): As the river enters flat plains, the land gradient decreases. The river widens, slows down, and swings from side to side in wide loops called meanders. Tributaries join it, increasing water volume.
- The Lower Course (Delta & Mouth Stage): Near its journey's end, the river flows very sluggishly. It deposits heavy sediments (silt and sand), splitting into multiple smaller channels (distributaries) to form a triangular delta before merging into the sea or ocean.
CBSE Step-by-Step Marking Scheme
Upper course: steep gradient, rapid flow, V-shaped valleys
1.5 Marks
Middle course: flat terrain, meanders, human settlements
1.5 Marks
Lower course: sluggish flow, silt deposition, delta formation
1 Mark
Q2
What is the difference between a tributary and a distributary? Give one Indian example of each.
Geographical Terminology
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Definitions and Differences:
- Tributary: A smaller stream or river that flows into and joins a larger parent river, increasing its total volume.
Example: River Yamuna is the largest tributary of River Ganga (joining at Prayagraj). - Distributary: A channel that branches off from the main river near its mouth in a delta and carries water away toward the sea without rejoining the main stream.
Example: River Hooghly in West Bengal is a major distributary branching off from River Ganga.
CBSE Step-by-Step Marking Scheme
Accurate definition and role of a tributary + Indian example
1.5 Marks
Accurate definition and role of a distributary + Indian example
1.5 Marks
Q3
Why are river basins historically known as the 'cradles of human civilization'? State three reasons.
Historical & Environmental Insight
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Ancient human civilizations—such as the Indus Valley Civilization along the Indus River and Mesopotamian civilization along the Tigris and Euphrates—developed around river basins because:
- Abundant Freshwater: Rivers provided a perennial source of freshwater for drinking, cooking, livestock, and domestic needs.
- Fertile Alluvial Soil: Seasonal river floods deposited fresh silt on surrounding plains, creating nutrient-rich farmland ideal for growing food crops.
- Natural Transportation & Trade: Boats on rivers served as the fastest and easiest trade routes to transport heavy goods before roads were built.
CBSE Step-by-Step Marking Scheme
Explanation of freshwater access for human settlements
1 Mark
Alluvial soil deposition for agricultural productivity
1 Mark
Transport and trade route connectivity
1 Mark
Q4
Observation & Comparison: Compare the water quality of a river near its mountain origin with water collected near a densely populated city.
Observation & Critical Thinking
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Comparative Analysis of River Water:
Conclusion: Human urbanization and untreated wastewater severely degrade downstream river water quality.
| Parameter | Mountain Source (Upstream) | City / Industrial Stretch (Downstream) |
|---|---|---|
| Water Transparency | Crystal clear, transparent | Murky, dark grey or brown |
| Odor | Clean, natural, odorless | Foul, pungent chemical/sewage smell |
| Dissolved Oxygen | High (supports trout & aquatic life) | Extremely low (causes fish kills) |
| Pollutants Present | Natural minerals and sand only | Plastic trash, untreated sewage, toxic industrial dyes |
CBSE Step-by-Step Marking Scheme
Accurate contrast in appearance, transparency, and odor
2 Marks
Analysis of dissolved oxygen and human pollutants
2 Marks
Q5
Map Skill Task: Name two major rivers flowing into the Bay of Bengal and two major rivers flowing into the Arabian Sea.
Map & Spatial Skill
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Based on India's physical geography and drainage patterns:
- Rivers Flowing Eastward into the Bay of Bengal:
- River Ganga: Flows east through Uttarakhand, Uttar Pradesh, Bihar, and West Bengal before emptying into the Bay of Bengal.
- River Godavari: Originates in Maharashtra and flows across Telangana and Andhra Pradesh into the Bay of Bengal.
- (Additional: Krishna, Mahanadi, Brahmaputra, Kaveri).
- Rivers Flowing Westward into the Arabian Sea:
- River Narmada: Flows westward through a rift valley between the Vindhya and Satpura ranges into the Gulf of Khambhat (Arabian Sea).
- River Tapi (Tapti): Flows westward parallel to Narmada through Madhya Pradesh, Maharashtra, and Gujarat into the Arabian Sea.
CBSE Step-by-Step Marking Scheme
Two accurate east-flowing Bay of Bengal rivers
2 Marks
Two accurate west-flowing Arabian Sea rivers (Narmada & Tapi)
2 Marks
Q6
What is the Gangetic River Dolphin, and why is its presence considered an indicator of a healthy river ecosystem?
Biodiversity & Ecology
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
The Gangetic River Dolphin (Platanista gangetica) is India's National Aquatic Animal, living exclusively in freshwater river stretches of the Ganga and Brahmaputra basins.
Significance as an Ecosystem Indicator:
Significance as an Ecosystem Indicator:
- These dolphins are almost completely blind and navigate and hunt fish using echolocation (sonar clicks).
- They can survive only in deep, clean, unpolluted freshwater with abundant fish and high dissolved oxygen.
- Therefore, their presence in a river stretch proves that the aquatic food chain is healthy and chemical pollution is low. When river water becomes polluted or silty, dolphins migrate away or die out.
CBSE Step-by-Step Marking Scheme
Identification of Gangetic dolphin as National Aquatic Animal
1 Mark
Explanation of reliance on clean water and echolocation
1 Mark
Role as biological indicator of river health
1 Mark
Q7
[Textbook Activity & Question 1] In 'Journey of a River', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Journey of a River
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 2] In 'Journey of a River', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Journey of a River
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 3] In 'Journey of a River', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Journey of a River
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 4] In 'Journey of a River', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Journey of a River
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 5] In 'Journey of a River', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Journey of a River
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 6] In 'Journey of a River', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Journey of a River
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 7] In 'Journey of a River', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Journey of a River
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 8] In 'Journey of a River', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Journey of a River
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 9] In 'Journey of a River', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Journey of a River
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 10] In 'Journey of a River', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Journey of a River
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 11] In 'Journey of a River', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Journey of a River
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 12] In 'Journey of a River', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Journey of a River
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 13] In 'Journey of a River', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Journey of a River
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 14] In 'Journey of a River', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Journey of a River
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 15] In 'Journey of a River', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Journey of a River
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 16] In 'Journey of a River', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Journey of a River
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Journey of a River, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
Community Action Plan for Rejuvenating Polluted Urban Riverfronts
Case Scenario: During a field trip to a city riverbank, Class 5 students noticed piles of plastic bottles, rotting floral offerings, and a municipal open storm drain pouring foamy grey wastewater directly into the river water where people were bathing.
Analytical Task: Propose a 4-point student-led action plan to protect and restore this urban riverfront, combining community awareness with scientific engineering solutions.
Student-Led Urban River Rejuvenation Action Plan:
- Installation of Sewage Treatment Plants (STPs): Petitions submitted to municipal authorities demanding that all urban storm drains pass through bio-filters and decentralized STPs before discharging treated effluent into the river.
- Riverfront Trash Traps & Booms: Installing floating mesh booms across drainage mouths to physically trap plastic bottles, polythene, and floating trash before they enter the main river current.
- Dedicated Eco-Friendly Immersion Ponds: Constructing designated artificial immersion tanks near riverbanks for religious ceremonies and flowers, preventing toxic chemical paints from contaminating the natural stream.
- Riparian Vegetative Bio-Shield: Mobilizing local schools and citizen groups to plant native riverside trees (like Neem, Peepal, Arjun, and Vetiver grass) along the embankments to prevent soil erosion and naturally absorb excess chemical nitrates.
CBSE Assessment Rubric: 2 Marks for engineering solutions (STPs & trash booms) + 3 Marks for community engagement, dedicated tanks, and riparian vegetative bio-shields = 5 Marks
3
Unit 2: Health and Well-being • Class 5 EVS (New NEP 2020)
Chapter 3: The Mystery of Food
Understanding food spoilage, microbial growth, traditional and modern preservation methods, and nutritional balance
Chapter Highlights, Environmental Insights & Scientific Ideas
- Food Spoilage vs Food Wastage: Food spoilage occurs when chemical and biological changes render food unsafe for consumption; food wastage occurs when wholesome, edible food is discarded unconsumed.
- Causes of Food Spoilage: Growth of microorganisms (bacteria, yeast, moulds/fungi), presence of enzymes, excessive moisture, and warm ambient temperature.
- Recognizing Spoiled Food: Visible cottony or green mould growth, sour or bitter taste, foul putrid smell, slimy surface texture, and gas bubbles in liquids.
- Traditional Preservation Methods: Drying/dehydration (removing moisture), salting and pickling (creating hypertonic conditions inhibiting bacterial growth), sweetening (jams and murabba), and boiling/cooking.
- Modern Food Preservation: Pasteurization (rapid heating followed by quick chilling in milk), refrigeration (slowing microbial activity at low temperatures), deep freezing, and vacuum packaging.
- Reading Food Labels: Checking Manufacturing Date, Best Before / Expiry Date, Ingredients, FSSAI quality seal, and Vegetarian/Non-vegetarian indicators (green/brown dots).
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
What causes food to spoil, and what are four visible or sensory signs indicating that cooked food is no longer safe to eat?
Food Science & Health
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Primary Causes of Food Spoilage: Food spoils due to the rapid growth of microorganisms like bacteria, yeasts, and moulds (fungi). These microbes thrive in the presence of moisture, warm ambient temperature, and oxygen, breaking down food proteins and carbohydrates while producing toxins.
Four Sensory Signs of Spoiled Food:
Four Sensory Signs of Spoiled Food:
- Foul Odor: A sour, rancid, or putrid smell indicating bacterial decomposition.
- Surface Appearance: Visible white, green, or black furry patches (mould spores) developing on breads, fruits, or rotis.
- Altered Texture: Slimy or sticky film covering cooked curries, dals, or boiled vegetables.
- Taste Change: A distinctly bitter, fermented, or acidic sour taste (even before visible mould appears).
CBSE Step-by-Step Marking Scheme
Explanation of microorganisms (bacteria/fungi), moisture, warmth
2 Marks
Four distinct sensory indicators (odor, mould, texture, taste)
2 Marks
Q2
Explain four scientific methods commonly used in Indian households to preserve food for several months without refrigeration.
Traditional Preservation Techniques
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Four traditional Indian food preservation techniques include:
- Sun-Drying (Dehydration): Removing moisture content so microorganisms cannot survive or reproduce.
Examples: Papad, dried red chillies, raw mango slices (amchur), and methi leaves. - Salting & Pickling (Addition of Oil and Salt): High salt concentration draws out moisture from bacterial cells through osmosis, killing them. Mustard oil forms an airtight seal preventing fungal spores from landing on food.
Examples: Mango pickle (achar), lime pickle, and salted fish. - Sweetening (High Sugar Concentration): Thick sugar syrups bind water molecules, preventing microbes from absorbing moisture needed to grow.
Examples: Amla murabba, apple jam, and gulkand. - Boiling (Heat Inactivation): High temperatures kill vegetative bacterial cells and inactivate enzymes.
Example: Boiling fresh milk twice a day to prevent curdling.
CBSE Step-by-Step Marking Scheme
Sun-drying: moisture removal principle + examples
1 Mark
Salting/pickling: osmotic action + oil barrier
1 Mark
Sugar preservation in jams/murabba
1 Mark
Boiling/heat sterilization principle
1 Mark
Q3
Hands-on Activity: Describe the bread mould experiment. What changes are observed over a 5-day observation period?
Scientific Investigation
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Bread Mould Growth Investigation:
- Procedure: Take a fresh slice of bread, sprinkle a few drops of clean water on it (do not make it soggy), place it inside an airtight transparent plastic box or zip-lock pouch, and leave it undisturbed in a warm, dark corner of the kitchen for 5 days.
- Daily Observations:
- Day 1–2: No visible changes; bread feels slightly moist.
- Day 3: Faint whitish, cotton-like fuzzy patches appear on the bread surface.
- Day 4: The patches turn pale green or greyish-black with a distinct stale, musty smell.
- Day 5: Dense dark greenish-black velvety colonies (sporangia of *Rhizopus* mould) spread across the slice. The bread softens and rots.
- Inference: Fungal spores present in the air landed on the bread and germinated rapidly because of the moisture, warmth, and nutrient-rich starch.
CBSE Step-by-Step Marking Scheme
Setup procedure using moist bread in closed container
1.5 Marks
Accurate day-by-day developmental observations
1.5 Marks
Scientific inference regarding airborne fungal spores and moisture
1 Mark
Q4
Why is it essential to inspect food packaging labels before purchasing? List four crucial details printed on a food wrapper.
Consumer Literacy & Health
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Inspecting packaging labels ensures that consumers purchase safe, hygienic, unexpired food and are aware of potential food allergens and nutritional content.
Four Essential Details Found on Packaged Food:
Four Essential Details Found on Packaged Food:
- Manufacturing & Expiry / Best Before Date: Indicates the window during which the product remains fresh and safe to eat. Consuming expired food risks food poisoning.
- FSSAI Logo and License Number: Guarantees that the product complies with government food safety and hygiene standards.
- Vegetarian / Non-Vegetarian Symbol: A green dot inside a square denotes vegetarian food; a brown dot inside a square denotes non-vegetarian ingredients.
- Ingredients & Nutritional Facts: Details calories, added sugars, preservatives, and allergens (like nuts, gluten, or dairy).
CBSE Step-by-Step Marking Scheme
Reason for inspecting labels (safety, quality, health)
1 Mark
Identification of Expiry/Best Before date and FSSAI logo
1 Mark
Veg/Non-veg mark and ingredient listing
1 Mark
Q5
What is 'Pasteurization', and how was this method discovered by Louis Pasteur to keep milk fresh?
Scientific Discovery & Technology
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Pasteurization is a food preservation process where liquid food (especially milk) is heated to a specific temperature for a set time and then chilled rapidly to destroy harmful disease-causing microorganisms without altering the food's taste or nutritional value.
How it Works:
How it Works:
- Fresh milk is heated to approximately 70°C for 15 to 30 seconds.
- It is then suddenly chilled to below 10°C and packaged immediately into sterile pouches.
- The sudden temperature shock destroys pathogenic bacteria like *Salmonella* and *Mycobacterium*, allowing packaged pasteurized milk to be consumed safely even without immediate boiling.
CBSE Step-by-Step Marking Scheme
Definition of pasteurization as thermal treatment
1.5 Marks
Precise process: heating to ~70°C then rapid chilling below 10°C
1.5 Marks
Q6
Differentiate between 'food spoilage' and 'food wastage'. Suggest three practical ways families can eliminate food wastage.
Ethics & Environmental Awareness
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Difference:
- Food Spoilage: Natural decay caused by bacteria and fungi that makes food unsafe or hazardous to consume.
- Food Wastage: Edible, perfectly good food that is discarded due to over-purchasing, excess cooking, or careless disposal.
- Smart Serving Sizes: Take only as much food on your plate as you can finish; take second helpings only if hungry.
- Plan Meals & Grocery Lists: Check refrigerator contents before buying fresh groceries to avoid buying duplicate perishables.
- Repurpose Leftovers: Store leftover rotis, rice, and vegetables safely in the refrigerator and convert them into nutritious breakfasts (e.g. vegetable fried rice or stuffed parathas).
CBSE Step-by-Step Marking Scheme
Clear contrast between spoilage (decay) and wastage (discarding edible food)
1.5 Marks
Three practical household waste prevention strategies
1.5 Marks
Q7
[Textbook Activity & Question 1] In 'The Mystery of Food', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • The Mystery of Food
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 2] In 'The Mystery of Food', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • The Mystery of Food
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 3] In 'The Mystery of Food', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • The Mystery of Food
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 4] In 'The Mystery of Food', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • The Mystery of Food
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 5] In 'The Mystery of Food', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • The Mystery of Food
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 6] In 'The Mystery of Food', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • The Mystery of Food
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 7] In 'The Mystery of Food', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • The Mystery of Food
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 8] In 'The Mystery of Food', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • The Mystery of Food
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 9] In 'The Mystery of Food', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • The Mystery of Food
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 10] In 'The Mystery of Food', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • The Mystery of Food
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 11] In 'The Mystery of Food', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • The Mystery of Food
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 12] In 'The Mystery of Food', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • The Mystery of Food
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 13] In 'The Mystery of Food', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • The Mystery of Food
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 14] In 'The Mystery of Food', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • The Mystery of Food
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 15] In 'The Mystery of Food', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • The Mystery of Food
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 16] In 'The Mystery of Food', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • The Mystery of Food
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In The Mystery of Food, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
Community Food Bank & Wedding Leftover Management
Case Scenario: In a neighborhood banquet hall, large quantities of cooked rice, paneer curries, and rotis were routinely thrown into municipal garbage dumpsters after wedding banquets, while unhoused families in nearby streets lacked nutritious meals.
Analytical Task: Develop an ethical, health-compliant protocol for partnering with community food rescue organizations to collect, test, and distribute surplus banquet food safely within 3 hours.
Community Food Rescue & Quality Protocol:
- Immediate Quality & Temperature Verification: Trained student volunteers and NGO workers check that surplus food has been kept in hot holding vessels (above 60°C) and shows zero signs of souring or odor.
- Hygienic Packaging: Food is transferred into clean, food-grade stainless steel containers or compostable boxes labeled with the preparation time and date.
- Rapid Cold-Chain or Thermal Transport: Utilizing insulated transport bags, the surplus food is dispatched within a strict 2-hour transit window to nearby shelters, night shelters, and orphanages.
- Safe Consumption Window: Food recipients are advised to consume the meals within 60 minutes of delivery, preventing bacterial multiplication.
CBSE Assessment Rubric: 2 Marks for food safety testing and packaging protocols + 3 Marks for strict time-window transport logistics and social impact = 5 Marks
4
Unit 3: Incredible India • Class 5 EVS (New NEP 2020)
Chapter 4: Our School — A Happy Place
Fostering inclusive school communities, Green School practices, waste segregation, water harvesting, and student safety
Chapter Highlights, Environmental Insights & Scientific Ideas
- Inclusive Learning Spaces: A happy school welcomes every student regardless of physical ability, gender, mother tongue, or socioeconomic background; features barrier-free architecture (ramps, wide doors, tactile tactile tiles).
- Green School Concept: Schools that reduce environmental footprint through renewable energy (rooftop solar), rainwater harvesting, natural daylight, and active tree planting.
- Waste Segregation at Source: Using color-coded bins—Green for wet organic waste (biodegradable food scraps, fruit peels) and Blue for dry recyclables (paper, cardboard, clean plastic).
- School Composting: Creating an aerobic compost pit to convert fallen garden leaves and vegetable scraps from the mid-day meal into rich organic humus for the school garden.
- Swachh Bharat Swachh Vidyalaya: Safe treated drinking water, gender-segregated clean sanitation facilities, regular soap handwashing stations, and student health monitoring.
- Safety & Well-being: Creating emotional and physical security through anti-bullying policies, fire safety evacuation drills, and peer support systems.
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
What makes a school truly 'inclusive' and welcoming for all children, including children with special needs (Divyangjan)?
Social Values & Inclusion
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
An inclusive school ensures that every child, regardless of physical, sensory, or socio-economic differences, learns alongside their peers with dignity and full participation.
Key Elements of an Inclusive School:
Key Elements of an Inclusive School:
- Barrier-Free Infrastructure: Gentle ramps with handrails alongside stairs, wide classroom doorways for wheelchairs, and accessible ground-floor toilets.
- Sensory Learning Aids: Tactile flooring tiles and Braille signage on classroom doors for visually challenged students; visual timetables and charts for hearing-impaired children.
- Culture of Empathy and Friendship: Teachers and peers who encourage collaborative group-work, celebrate diverse talents, and maintain a strict zero-tolerance policy toward bullying or teasing.
CBSE Step-by-Step Marking Scheme
Definition of inclusive education and equal dignity
1 Mark
Physical accommodations (ramps, wide doors, Braille)
1 Mark
Social atmosphere of peer empathy and anti-bullying
1 Mark
Q2
Explain waste segregation at source. What types of waste belong in the Green Bin and the Blue Bin?
Waste Management
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Waste Segregation at Source means separating different types of garbage at the exact moment and location they are generated, preventing contamination and enabling recycling and composting.
Color-Coded Segregation System:
Color-Coded Segregation System:
- Green Bin (Wet / Biodegradable Waste): Organic matter that decomposes naturally into soil.
Items: Fruit and vegetable peels, leftover food, tea leaves, fallen leaves, eggshells, and used paper napkins. - Blue Bin (Dry / Recyclable Waste): Non-biodegradable materials that can be processed and reused in factories.
Items: Plastic bottles, milk pouches, cardboard cartons, notebook paper, aluminum cans, glass bottles, and metal bottle caps.
CBSE Step-by-Step Marking Scheme
Definition and importance of sorting waste at source
1 Mark
Green bin contents (biodegradable organic materials with examples)
1 Mark
Blue bin contents (recyclable non-biodegradable items with examples)
1 Mark
Q3
How does a school compost pit turn organic waste into dark, nutrient-rich manure? Describe the biological process.
Biological Process & Soil Science
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
The School Composting Process:
- Digging the Pit: A shallow pit (about 1 metre deep) is dug in a shaded corner of the school garden.
- Layering Organic Materials:
- Brown Layer: Dry fallen leaves, shredded cardboard, and twigs (rich in Carbon).
- Green Layer: Vegetable peels, fruit rinds, and food scraps from the mid-day meal (rich in Nitrogen).
- Role of Decomposers: Soil bacteria, fungi, and earthworms enter the moist pile. They feed on organic waste, breaking down complex plant matter into simple nutrients.
- Aeration & Moisture: Turning the pile weekly provides oxygen for aerobic bacteria and prevents bad odors. Light sprinkling of water maintains essential humidity.
- Result (Humus): Within 6–8 weeks, the waste transforms into crumbly, dark brown, sweet-smelling organic manure (humus) that enriches garden soil without synthetic chemicals.
CBSE Step-by-Step Marking Scheme
Setup and alternating brown (carbon) and green (nitrogen) layers
1.5 Marks
Action of decomposers (bacteria, fungi, earthworms)
1.5 Marks
Outcome: organic manure/humus in 6-8 weeks
1 Mark
Q4
Activity: Create a 5-point 'School Cleanliness & Safety Inspection Checklist' that student monitors can execute weekly.
Practical Checklist & Leadership
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Weekly Student Safety & Cleanliness Audit Checklist:
- Drinking Water Station: Check that RO filters are operating, taps are not dripping, and surrounding drainage is clean with no stagnant puddles where mosquitoes could breed.
- Restrooms & Handwashing: Verify that soap dispensers are fully filled, running water is available in all taps, and toilet floors are clean, dry, and sanitized.
- Waste Bins: Inspect classrooms and corridors to ensure that waste bins have lids, are properly separated into Green and Blue bins, and are emptied before overflowing.
- Corridor & Staircase Safety: Ensure stair handrails are firmly anchored, pathways are free of obstacles, loose electrical wires, or slippery wet patches.
- Playground & Sports Equipment: Check that swing chains, slides, and football goalposts are securely bolted without sharp protruding nails or broken glass on the field.
CBSE Step-by-Step Marking Scheme
Five comprehensive, realistic inspection areas
2.5 Marks
Clear hygiene, disease-prevention, and physical safety criteria
1.5 Marks
Q5
What is the 'Green School' initiative, and how can students contribute to reducing their school's carbon footprint?
Environmental Citizenship
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
A Green School is an educational institution that actively designs its campus, operations, and curriculum to conserve natural resources, minimize waste, and foster environmental stewardship.
Student Contributions:
Student Contributions:
- Energy Conservation: Appoint 'Energy Monitors' in every classroom to turn off fans, tube-lights, and smartboards whenever the class moves to the playground or lab.
- Herbal Garden (Poshan Vatika): Plant native trees, flowering shrubs, and vegetables in school courtyards to enhance biodiversity and provide fresh produce for school meals.
- Zero Single-Use Plastic Policy: Bring water in reusable steel bottles and carry lunches in stainless steel tiffin boxes, completely banning disposable plastic wrappers.
CBSE Step-by-Step Marking Scheme
Definition of Green School concept
1 Mark
Practical student contributions (energy saving, planting, plastic elimination)
2 Marks
Q6
Why is handwashing with soap for 20 seconds essential before eating? Explain the scientific rationale.
Hygiene & Preventative Health
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Throughout the school day, students touch desks, door handles, sports balls, and library books, picking up millions of invisible bacteria and virus particles on their hands.
Scientific Rationale for 20 Seconds with Soap:
Scientific Rationale for 20 Seconds with Soap:
- Soap Breaks Lipid Membranes: Soap molecules have a polar water-loving head and a non-polar fat-loving tail. The tail binds to the protective fatty membrane of germs and dissolves it, destroying the virus or bacteria.
- Friction Dislodges Germs: Rubbing palms, backs of hands, between fingers, and under fingernails for at least 20 seconds creates enough mechanical lather to detach stubborn germs from skin grooves.
- Rinsing Away Contaminants: Running water washes the dead microbes away, preventing diarrheal diseases, stomach infections, and influenza.
CBSE Step-by-Step Marking Scheme
Explanation of microbial transfer on surfaces
1 Mark
Chemical action of soap on germ lipid membranes
1 Mark
Importance of 20 seconds friction and thorough rinsing
1 Mark
Q7
[Textbook Activity & Question 1] In 'Our School — A Happy Place', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Our School — A Happy Place
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 2] In 'Our School — A Happy Place', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Our School — A Happy Place
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 3] In 'Our School — A Happy Place', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Our School — A Happy Place
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 4] In 'Our School — A Happy Place', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Our School — A Happy Place
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 5] In 'Our School — A Happy Place', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Our School — A Happy Place
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 6] In 'Our School — A Happy Place', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Our School — A Happy Place
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 7] In 'Our School — A Happy Place', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Our School — A Happy Place
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 8] In 'Our School — A Happy Place', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Our School — A Happy Place
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 9] In 'Our School — A Happy Place', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Our School — A Happy Place
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 10] In 'Our School — A Happy Place', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Our School — A Happy Place
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 11] In 'Our School — A Happy Place', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Our School — A Happy Place
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 12] In 'Our School — A Happy Place', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Our School — A Happy Place
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 13] In 'Our School — A Happy Place', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Our School — A Happy Place
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 14] In 'Our School — A Happy Place', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Our School — A Happy Place
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 15] In 'Our School — A Happy Place', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Our School — A Happy Place
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 16] In 'Our School — A Happy Place', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Our School — A Happy Place
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our School — A Happy Place, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
Transforming an Idle School Courtyard into a Biodiverse Learning Eco-Hub
Case Scenario: An unpaved 200-square-metre courtyard behind the school cafeteria was filled with discarded furniture, thorny weeds, and plastic litter. The Student Council proposed reclaiming this space as an educational Eco-Hub.
Analytical Task: Develop an actionable proposal for the School Principal outlining how students, teachers, and parents can collaborate to transform this abandoned courtyard into a self-sustaining biodiversity zone.
Action Proposal: School Biodiversity Learning Hub
- Community Clean-up & Shramdaan: Organize a Saturday volunteer drive with students, teachers, and parents to clear weeds, collect plastic for recycling, and repair salvageable wooden desks into garden benches.
- Kitchen Garden (Poshan Vatika): Use discarded tyres and wooden crates as raised planting beds to grow mint, coriander, spinach, and tomatoes irrigated using wastewater from the kitchen rice-rinsing station.
- Pollinator Habitat: Plant indigenous nectar-rich flowering shrubs (Marigold, Hibiscus, Tulsi) to attract honeybees, butterflies, and ladybirds for hands-on pollination lessons.
- Twin Aerobic Compost Bins: Construct two brick-lined composting chambers fed by cafeteria organic scraps, producing dark fertilizer for the courtyard garden.
- Outdoor Nature Classroom: Place log seats under shaded trees where science, art, and environmental studies classes are conducted in the fresh air.
CBSE Assessment Rubric: 2 Marks for collaborative clean-up and recycling plan + 3 Marks for educational integration (kitchen garden, pollinator plants, compost bins, outdoor classroom) = 5 Marks
5
Unit 3: Incredible India • Class 5 EVS (New NEP 2020)
Chapter 5: Our Vibrant Country
Celebrating India's physical geography, linguistic diversity, seasonal harvest festivals, indigenous folk arts, and national unity
Chapter Highlights, Environmental Insights & Scientific Ideas
- Physiographic Diversity: India spans six distinct geographical zones—Northern Himalayan Mountains, Northern Alluvial Plains, Great Indian Desert (Thar), Peninsular Deccan Plateau, Coastal Plains, and Island Groups (Andaman & Nicobar, Lakshadweep).
- Political Geography: India is a sovereign democratic republic comprising 28 States and 8 Union Territories with New Delhi as the National Capital.
- Harvest & Seasonal Festivals: Festivals celebrate agricultural cycles and nature's generosity—Baisakhi (Punjab), Makar Sankranti (North/West), Pongal (Tamil Nadu), Bihu (Assam), and Onam (Kerala).
- Indigenous Folk Art Traditions: Renowned regional folk arts using natural minerals and plant dyes include Madhubani (Bihar), Warli (Maharashtra), Pattachitra (Odisha), and Kalamkari (Andhra Pradesh).
- Traditional Cuisines & Attire: Regional food and clothing reflect local climate and crops—e.g. Makki ki Roti & Sarson ka Saag in chilly Punjab winters; Appam and Fish Curry in coastal humid Kerala.
- Unity in Diversity (अनेकता में एकता): Despite distinct regional languages, scripts, attire, and customs, constitutional values and shared cultural heritage bind the nation as one family.
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
Name the six major physiographic (physical) divisions of India. Briefly describe the characteristics of two of them.
Physical Geography
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
India's six major physiographic divisions are:
- The Northern Mountains (The Great Himalayas)
- The Northern Alluvial Plains (Indo-Gangetic Plains)
- The Great Indian Desert (Thar Desert)
- The Peninsular Plateau (Central Highlands & Deccan Plateau)
- The Coastal Plains (Western & Eastern Coastal Belts)
- The Island Groups (Lakshadweep in Arabian Sea & Andaman and Nicobar in Bay of Bengal)
- The Great Himalayas: Earth's highest mountain range, acting as a climatic barrier that prevents freezing Central Asian winds from entering India and intercepts monsoon clouds to cause heavy rainfall. It is the perennial source of rivers like Ganga, Yamuna, and Indus.
- The Coastal Plains: Narrow coastal strips flanked by the Arabian Sea and Bay of Bengal featuring fertile deltas, mangrove forests (Sundarbans), fishing harbors, and coconut plantations.
CBSE Step-by-Step Marking Scheme
Complete list of 6 physiographic divisions
2 Marks
Detailed description of two chosen landforms
2 Marks
Q2
How do harvest festivals across different Indian states celebrate agriculture and seasonal changes? Give three examples.
Cultural Traditions
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Harvest festivals commemorate the successful ripening and gathering of agricultural crops, expressing gratitude to the Sun, Earth, rain, and working cattle.
Three Prominent Harvest Festivals:
Three Prominent Harvest Festivals:
- Pongal (Tamil Nadu): A 4-day festival celebrated in mid-January. Freshly harvested rice is boiled with milk and jaggery in clay pots until it spills over, symbolizing abundance and prosperity (Pongalo Pongal!). Cattle are decorated on Mattu Pongal.
- Bihu (Bhogali / Magh Bihu in Assam): Marks the end of winter harvesting. Families build thatch pavilions (Bhelaghar), light bonfires (Meji), and feast on pitha and roasted rice cakes while dancing to dhol beats.
- Makar Sankranti (North & West India): Celebrates the Sun's northward transit (Uttarayana). Celebrated with holy river dips, flying colorful kites, and eating sesame seeds and jaggery (Tilgul).
CBSE Step-by-Step Marking Scheme
Concept of harvest festivals celebrating agricultural abundance
1 Mark
Accurate details for two regional harvest festivals (Pongal, Bihu, Sankranti)
2 Marks
Q3
Compare two traditional Indian folk art forms: Madhubani painting and Warli art. What natural materials and themes do they use?
Traditional Arts & Crafts
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Comparison of Folk Art Forms:
| Feature | Madhubani Painting (Mithila) | Warli Art |
|---|---|---|
| Origin Region | Mithila region of Bihar | North Sahyadri region of Maharashtra |
| Base Surface | Mud walls, handmade paper, canvas | Red ochre / cow dung mud plaster walls |
| Colors & Materials | Natural pigments: turmeric (yellow), indigo (blue), soot (black), rice paste (white) | White paste made from ground rice, water, and gum binder; bamboo sticks as brushes |
| Core Motifs & Themes | Sun, moon, fish, birds, lotus, and deities drawn with double-line borders | Geometric circles, triangles, Tarpa dance in circles, harvest, and hunting |
CBSE Step-by-Step Marking Scheme
State of origin and base canvas for both art forms
1.5 Marks
Natural pigments and tools used
1.5 Marks
Signature geometric and thematic motifs identified
1 Mark
Q4
How does geographical climate dictate the clothing, shelter, and staple diet of people living in Ladakh versus Kerala?
Climatic Adaptation
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Geographical terrain and climate directly shape regional lifestyles:
1. Ladakh (High-Altitude Cold Desert):
1. Ladakh (High-Altitude Cold Desert):
- Climate: Extremely cold winters (-30°C), scarce rainfall, strong solar radiation.
- Clothing: Thick sheep wool robes (Gonka), Pashmina shawls, and felt wool boots.
- Shelter: Thick mud-brick houses with small windows and flat wooden roofs used for drying apricots in autumn. Ground floor houses animals during freezing winter months.
- Diet: Barley (Tsampa), yak milk butter, Thukpa noodle soup, and hot butter tea (Gur-gur).
- Climate: Warm, tropical, humid with heavy monsoon rainfall.
- Clothing: Light, breathable white cotton clothes (Mundu and cotton sarees).
- Shelter: Houses with steeply sloping tiled roofs to shed torrential rainwater quickly, large windows, and open verandahs.
- Diet: Rice, fish curry, tapioca, coconut in every dish, and banana chips.
CBSE Step-by-Step Marking Scheme
Ladakh: woollen attire, mud insulation houses, barley/yak diet
2 Marks
Kerala: light cottons, sloping roofs, coconut/rice/fish diet
2 Marks
Q5
What is the historical meaning of the national motto 'Unity in Diversity'? Give two examples from everyday Indian life.
Civic Understanding
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
'Unity in Diversity' (अनेकता में एकता): Coined by India's first Prime Minister Jawaharlal Nehru, this phrase describes how people belonging to hundreds of diverse languages, religions, tribal groups, cuisines, and regional cultures coexist peacefully under a shared national identity and constitutional democracy.
Two Everyday Examples:
Two Everyday Examples:
- National Celebrations: On Independence Day and Republic Day, citizens from Kashmir to Kanyakumari sing the National Anthem (written in Bengali by Rabindranath Tagore) and honor the Tricolour.
- Culinary Fusion: South Indian Idli-Dosa, Punjabi Dal Makhani, Gujarati Dhokla, and Bengali sweets are loved and cooked in households across every single state in India.
CBSE Step-by-Step Marking Scheme
Explanation of Unity in Diversity concept
1.5 Marks
Two vibrant everyday cultural examples (celebrations and food)
1.5 Marks
Q6
Map Skill Task: On an outline map of India, locate and label the capital cities of: (a) Assam, (b) Rajasthan, (c) Tamil Nadu, and (d) West Bengal.
Map & Spatial Knowledge
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
State and Capital Identifications:
- Assam: Capital is Dispur (near Guwahati in northeastern India along River Brahmaputra).
- Rajasthan: Capital is Jaipur (known as the Pink City, located in western India).
- Tamil Nadu: Capital is Chennai (coastal metropolis located on the Coromandel Coast in southeastern India).
- West Bengal: Capital is Kolkata (historical cultural capital situated on the banks of River Hooghly).
CBSE Step-by-Step Marking Scheme
Correct pairing of all 4 state capitals
2 Marks
Accurate geographical orientation in India
1 Mark
Q7
[Textbook Activity & Question 1] In 'Our Vibrant Country', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Our Vibrant Country
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 2] In 'Our Vibrant Country', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Our Vibrant Country
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 3] In 'Our Vibrant Country', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Our Vibrant Country
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 4] In 'Our Vibrant Country', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Our Vibrant Country
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 5] In 'Our Vibrant Country', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Our Vibrant Country
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 6] In 'Our Vibrant Country', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Our Vibrant Country
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 7] In 'Our Vibrant Country', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Our Vibrant Country
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 8] In 'Our Vibrant Country', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Our Vibrant Country
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 9] In 'Our Vibrant Country', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Our Vibrant Country
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 10] In 'Our Vibrant Country', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Our Vibrant Country
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 11] In 'Our Vibrant Country', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Our Vibrant Country
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 12] In 'Our Vibrant Country', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Our Vibrant Country
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 13] In 'Our Vibrant Country', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Our Vibrant Country
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 14] In 'Our Vibrant Country', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Our Vibrant Country
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 15] In 'Our Vibrant Country', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Our Vibrant Country
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 16] In 'Our Vibrant Country', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Our Vibrant Country
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Our Vibrant Country, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
Student-Curated 'Incredible India Heritage Festival' Exhibition
Case Scenario: To celebrate National Integration Day, Class 5 students were asked to set up five regional discovery pavilions representing North, South, East, West, and North-East India.
Analytical Task: Design an interactive pavilion layout for the North-Eastern States (The Eight Sisters) showcasing their indigenous handlooms, bamboo craftsmanship, living root bridges, and organic agriculture.
Interactive North-Eastern Discovery Pavilion Plan:
- Living Root Bridge Diorama (Meghalaya): A 3D clay model displaying how Khasi villagers guide the flexible roots of Ficus elastica rubber fig trees across mountain torrents, demonstrating living botanical engineering.
- Bamboo & Cane Craft Center (Assam & Tripura): Hands-on display of eco-friendly bamboo items—flutes, fishing traps (Polo), woven hats (Japi), and zero-plastic water tumblers.
- Indigenous Handloom Textiles (Nagaland & Manipur): Vibrant handwoven tribal shawls featuring geometric Naga warrior patterns and Manipuri Inaphi shawls woven on traditional loin-looms.
- Organic Agriculture & Tea Tasting (Sikkim & Assam): Information panels highlighting Sikkim as India's first 100% certified organic farming state, alongside small samples of aromatic orthodox Assam CTC black tea.
- Folk Music Corner: Recorded melodies of the Bihu dance, bamboo dance (Cheraw from Mizoram), and traditional horns (Singphos).
CBSE Assessment Rubric: 2 Marks for authentic cultural representation of North-East states + 3 Marks for interactive student learning stations (bamboo crafts, organic farming, living root bridges) = 5 Marks
6
Unit 3: Incredible India • Class 5 EVS (New NEP 2020)
Chapter 6: Some Unique Places
Investigating extraordinary ecological habitats: Ladakh's cold desert, Meghalaya's living root bridges, the Great Rann of Kutch, and Loktak Lake
Chapter Highlights, Environmental Insights & Scientific Ideas
- Ladakh (High-Altitude Cold Desert): Located over 3,000 metres above sea level in the rain-shadow of the Himalayas; features freezing arid climate, double-humped Bactrian camels, and Changpa nomads rearing Pashmina goats.
- Living Root Bridges (Jingkieng Jri) of Meghalaya: Grown across decades by indigenous Khasi and Jaintia tribes who guide aerial roots of *Ficus elastica* trees across roaring monsoon rivers; live structures grow stronger with age.
- The Great Rann of Kutch (Gujarat): World's largest seasonal salt marsh; submerged during monsoons and transformed into a gleaming white salt desert in winter; home to the endangered Indian Wild Ass (*Ghudkhur*).
- Loktak Lake (Manipur): The only floating lake on Earth, covered with floating circular biomass islands called *phumdis*; houses the world's only floating wildlife sanctuary—Keibul Lamjao National Park—home to the endangered Sangai brow-antlered deer.
- Mawsynram & Cherrapunji: World's wettest inhabited locations receiving over 11,000 mm of annual rainfall due to funneling monsoon clouds trapped by Khasi Hills.
- Ecological Sensitivity: These unique natural habitats require strict environmental safeguards against plastic litter, unchecked commercial tourism, and habitat degradation.
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
Why is Ladakh described as a 'Cold Desert'? How does its climate differ from the hot Thar Desert of Rajasthan?
Comparative Geography
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Why Ladakh is a Cold Desert:
- High Altitude Rain Shadow: Ladakh lies in the Himalayan rain shadow at an average elevation exceeding 3,000 metres. The massive Himalayan ranges block monsoon clouds from reaching it, resulting in sparse annual rainfall (less than 10 cm).
- Freezing Temperatures: Winter temperatures drop below -30°C, and rivers freeze solid. Air is so thin that solar radiation is intense while shadows remain freezing cold.
- Thar Desert: Characterized by scorching summer temperatures exceeding 48°C, sweeping sand dunes, and xerophytic thorny shrubs.
- Ladakh Cold Desert: Characterized by sub-zero freezing temperatures, snow-capped rocky mountains, glaciers, and sparse alpine vegetation along stream beds.
CBSE Step-by-Step Marking Scheme
Explanation of high altitude and Himalayan rain shadow effect
2 Marks
Clear contrast between freezing rocky desert and scorching sandy Thar desert
2 Marks
Q2
Explain how the Khasi and Jaintia tribes of Meghalaya create 'Living Root Bridges'. Why are these bridges superior to modern steel or wooden bridges in rainforests?
Indigenous Bio-Engineering
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Creation of Living Root Bridges (Jingkieng Jri):
- The Khasi and Jaintia tribes guide the flexible, aerial secondary roots of the Ficus elastica (Indian rubber fig tree) across mountain river chasms using hollowed betel nut tree trunks.
- Over 15 to 30 years, the aerial roots reach the opposite bank and take root in the soil.
- Villagers weave and intertwine the living roots together with rocks and timber, forming sturdy suspended pathways across the gorges.
- Living Structures Never Rot: In Meghalaya's extremely humid climate (receiving 11,000+ mm rain), steel bridges rust and timber bridges rot quickly. Living root bridges remain alive and absorb water.
- Strengthen with Age: As the tree grows and root trunks thicken, the bridge becomes sturdier over decades, supporting over 50 people simultaneously and surviving for centuries.
CBSE Step-by-Step Marking Scheme
Step-by-step description of guiding Ficus elastica aerial roots
2 Marks
Scientific explanation of why living roots do not rot and strengthen over time
2 Marks
Q3
What makes Loktak Lake in Manipur globally unique? What are 'phumdis' and which endangered animal lives on them?
Ecological Sanctuaries
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Unique Global Features of Loktak Lake:
- Loktak Lake is the largest freshwater lake in Northeast India and the world's only floating lake.
- What are Phumdis? Phumdis are thick, floating circular islands formed from a heterogeneous mass of soil, organic vegetation, and decomposed plant roots. Local fishermen (called *Meiteis*) build small thatched huts on larger phumdis to live and fish.
- Keibul Lamjao National Park: The southern part of the lake houses the world's only floating national park (spanning 40 sq km).
- Endangered Inhabitant: It is the exclusive natural home of the Sangai (Brow-antlered deer), fondly called the Dancing Deer of Manipur because it treads delicately on the spongy, floating phumdi vegetation.
CBSE Step-by-Step Marking Scheme
Identification of Loktak Lake as world's only floating lake
1 Mark
Accurate description of floating phumdis (soil and organic mats)
1.5 Marks
Keibul Lamjao National Park and endangered Sangai deer
1.5 Marks
Q4
Describe the Great Rann of Kutch in Gujarat. How does it transition from a submerged sea into a white salt desert?
Geomorphology & Wildlife
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
The Great Rann of Kutch in Gujarat is the world's largest seasonal salt marsh:
- Monsoon Inundation: During the summer southwest monsoon (July to September), sea water from the Arabian Sea rushes in, flooding the vast low-lying basin into a shallow saline lake.
- Winter Transformation into White Desert: As the rains stop and the scorching winter sun evaporates the shallow water, billions of tons of crystalline salt remain deposited across thousands of square kilometers, creating a dazzling, snow-white salt plain.
- Unique Wildlife: The Little Rann of Kutch is the last global refuge of the endangered Indian Wild Ass (Khur), and its shallow saline waters host nesting colonies of thousands of migratory pink Greater Flamingos.
CBSE Step-by-Step Marking Scheme
Monsoon flooding from Arabian Sea explained
1 Mark
Evaporation leading to sparkling white salt crust
1 Mark
Identification of Indian Wild Ass and Flamingos
1 Mark
Q5
Why are Changpa nomads of Ladakh deeply connected with the Pashmina goat? How does cold weather influence Pashmina wool?
Animal Adaptations & Livelihood
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
The Changpas are a nomadic pastoral tribe who live in high-altitude Changthang plateau at heights of 4,500 to 5,000 metres in portable cone-shaped yak-hair tents called Rebo.
Connection with Pashmina Goats:
Connection with Pashmina Goats:
- At extreme sub-zero temperatures (-40°C), the goats grow an exceptionally fine, warm undercoat of ultra-soft hair (underfleece) to protect their bodies from freezing.
- This hair is six times thinner than a human hair and cannot be spun by machine. In spring, the goats shed this fine coat, which the Changpas comb out carefully.
- Weavers in Kashmir hand-spin and hand-weave this fleece into world-renowned Pashmina shawls, providing the nomads with essential livelihood.
CBSE Step-by-Step Marking Scheme
Identification of Changpa tribe and high-altitude nomadic life
1 Mark
Biological adaptation of goat growing fine underfleece in freezing cold
1 Mark
Handwoven Pashmina shawl production and cultural trade
1 Mark
Q6
Why do Mawsynram and Cherrapunji receive the highest rainfall in the world? Explain the role of the Khasi Hills.
Meteorology & Topography
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Mawsynram and Cherrapunji in Meghalaya receive over 11,000 mm of rain annually due to their unique funnel-shaped topography:
- Moisture-laden monsoon winds traveling north from the warm Bay of Bengal hit the sudden, steep vertical wall of the Khasi Hills.
- The hills act like a gigantic funnel, trapping the rain clouds in a deep canyon.
- Forced to rise rapidly to over 1,400 metres, the air cools rapidly, causing intense, continuous condensation and torrential orographic rainfall over these two towns.
CBSE Step-by-Step Marking Scheme
Bay of Bengal monsoon winds identified
1 Mark
Funnel effect and barrier role of the steep Khasi Hills
1 Mark
Rapid orographic cooling resulting in world-record rainfall
1 Mark
Q7
[Textbook Activity & Question 1] In 'Some Unique Places', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Some Unique Places
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 2] In 'Some Unique Places', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Some Unique Places
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 3] In 'Some Unique Places', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Some Unique Places
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 4] In 'Some Unique Places', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Some Unique Places
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 5] In 'Some Unique Places', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Some Unique Places
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 6] In 'Some Unique Places', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Some Unique Places
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 7] In 'Some Unique Places', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Some Unique Places
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 8] In 'Some Unique Places', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Some Unique Places
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 9] In 'Some Unique Places', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Some Unique Places
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 10] In 'Some Unique Places', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Some Unique Places
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 11] In 'Some Unique Places', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Some Unique Places
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 12] In 'Some Unique Places', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Some Unique Places
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 13] In 'Some Unique Places', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Some Unique Places
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 14] In 'Some Unique Places', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Some Unique Places
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 15] In 'Some Unique Places', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Some Unique Places
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 16] In 'Some Unique Places', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Some Unique Places
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Some Unique Places, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
Eco-Tourism Guidelines for Fragile High-Altitude and Wetland Ecosystems
Case Scenario: Booming tourism in Ladakh and Loktak Lake has resulted in diesel-spewing tourist vehicles, discarded single-use plastic water bottles in mountain streams, and motorboats disturbing nesting birds and wildlife.
Analytical Task: Formulate a code of conduct for responsible tourists visiting unique ecological wonders like Ladakh and Loktak Lake to preserve their delicate biodiversity.
Responsible Eco-Tourist Code of Conduct:
- Zero Single-Use Plastic Mandate: Carry a refillable copper/steel water bottle; use community water-filtration refilling stations instead of buying commercial disposable plastic bottles.
- Leave No Trace (Pack It In, Pack It Out): Carry all personal snack wrappers and waste back to major towns with recycling facilities rather than littering remote mountain passes or lake shores.
- Silent & Clean Transport: Restrict motorboat speeds on Loktak Lake near the Keibul Lamjao floating sanctuary; encourage electric vehicles and bicycles in Leh town.
- Respect Indigenous Lifestyles & Wildlife: Keep a safe distance from wildlife (Pashmina goats, Sangai deer, wild asses); never feed wild animals human packaged food.
- Support Local Communities: Stay in traditional village homestays and purchase authentic handmade crafts (like local apricot jam and handwoven woolens) directly from indigenous artisans.
CBSE Assessment Rubric: 2 Marks for waste and plastic prevention rules + 3 Marks for wildlife respect, noise limits, and sustainable local community homestay support = 5 Marks
7
Unit 4: Things Around Us • Class 5 EVS (New NEP 2020)
Chapter 7: Energy — How Things Work
Understanding energy forms, renewable vs fossil sources, everyday mechanical transformations, and sustainable conservation
Chapter Highlights, Environmental Insights & Scientific Ideas
- Definition of Energy: Energy is the capacity or ability to do work; it exists in many forms including solar, thermal, mechanical, chemical, electrical, and kinetic energy.
- The Sun as Primary Energy Source: Sunlight powers plant photosynthesis, drives wind circulation, and evaporates water in the hydrological cycle, making the Sun the ultimate driver of Earth's energy.
- Renewable Energy: Inexhaustible natural sources that regenerate quickly and do not emit greenhouse gases—Solar (photovoltaic panels), Wind (turbines), Hydroelectric (flowing water), and Biogas.
- Non-Renewable Fossil Fuels: Coal, petroleum (petrol, diesel), and natural gas formed over millions of years from buried prehistoric organisms; exhaustible and causes air pollution and global warming.
- Energy Transformations in Everyday Machines: Energy cannot be created or destroyed, only transformed (e.g. Electric iron: electrical to thermal; Fan: electrical to kinetic; Battery: chemical to electrical).
- Simple Machines: Force multipliers and directional tools that make mechanical work easier—inclined plane, lever, pulley, screw, wheel and axle, and wedge.
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
What is the key scientific difference between renewable and non-renewable energy sources? Give three examples of each.
Energy Fundamentals
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Definitions and Differences:
- Renewable Energy: Energy derived from inexhaustible natural cycles and resources that replenish naturally on a human timescale, producing negligible air pollution and greenhouse gases.
Examples: Solar energy (Sun), Wind energy (Windmills), and Hydroelectric energy (Flowing river water). - Non-Renewable Energy: Energy derived from finite geological reserves formed over millions of years inside Earth's crust. Once consumed, they cannot be replaced in a human lifetime, and burning them releases toxic smoke and carbon dioxide.
Examples: Coal, Petrol (Crude oil / Petroleum), and Natural Gas (CNG/LPG).
CBSE Step-by-Step Marking Scheme
Renewable energy definition and 3 examples
2 Marks
Non-renewable energy definition and 3 examples
2 Marks
Q2
Why is the Sun recognized as the primary or ultimate source of almost all energy on planet Earth?
Scientific Reasoning
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
The Sun is the ultimate source of Earth's energy because:
- Powers Plant Photosynthesis: Sunlight enables green plants to synthesize glucose and oxygen. All herbivores, carnivores, and humans depend on this plant biomass for chemical food energy.
- Origin of Fossil Fuels: Coal and crude oil are the compressed, fossilized remains of ancient plants and prehistoric organisms that originally harnessed sunlight millions of years ago.
- Drives Natural Weather Cycles: Unequal solar heating of Earth's surface creates wind currents that power wind turbines, while solar evaporation drives the rain cycle that fills hydroelectric river reservoirs.
CBSE Step-by-Step Marking Scheme
Photosynthesis and food web dependence
1 Mark
Solar origin of fossil fuels explained
1 Mark
Driver of wind and water cycles
1 Mark
Q3
Identify the energy transformation taking place in each of the following everyday devices: (a) Electric fan, (b) Toaster, (c) Solar street light, and (d) Torch battery.
Energy Transformations
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Energy transformation in each device:
- Electric Fan: Electrical Energy → Kinetic (Mechanical) Energy of rotating blades, which moves air.
- Electric Toaster: Electrical Energy → Thermal (Heat) Energy and Light Energy that toasts bread slices.
- Solar Street Light: Solar (Light) Energy → Chemical Energy stored in lithium batteries during the day → Electrical Energy → Light Energy emitted by LED lamps at night.
- Torch Battery (Dry Cell): Chemical Energy stored inside battery pastes → Electrical Energy → Light and Heat Energy in the bulb.
CBSE Step-by-Step Marking Scheme
Electric fan: electrical to kinetic
1 Mark
Electric toaster: electrical to thermal/heat
1 Mark
Solar street light: solar to chemical to electrical/light
1 Mark
Torch battery: chemical to electrical/light
1 Mark
Q4
Hands-on Activity: Describe how to build a simple paper pinwheel (turbine) to demonstrate that wind carries kinetic energy.
Hands-on Activity
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Pinwheel (Wind Turbine) Demonstration:
- Materials: A square sheet of colored craft paper (15 cm × 15 cm), scissors, a push-pin, a wooden pencil with an eraser top, and a small plastic bead.
- Procedure:
- Draw two diagonal lines across the square sheet from opposite corners, meeting at the center point.
- Cut along the four diagonal lines with scissors, stopping about 1.5 cm before reaching the center point.
- Fold every alternating tip (every second corner) into the center without creasing the folds.
- Push the pin through the folded tips and the center, slide on the bead (to reduce friction), and push the pin firmly into the pencil eraser.
- Blow gently on the paper blades or run holding the pencil forward.
- Scientific Observation: The pinwheel spins rapidly. The kinetic energy of moving air pushes against the angled paper vanes, creating rotational mechanical motion just like an industrial wind turbine.
CBSE Step-by-Step Marking Scheme
List of materials and clear construction steps
2 Marks
Explanation of moving air transferring kinetic energy to rotate blades
2 Marks
Q5
What are 'Simple Machines'? Name four types of simple machines found in homes and explain how one of them makes work easier.
Mechanical Principles
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
A Simple Machine is a mechanical device with few or no moving parts that modifies the direction or magnitude of a force, making physical tasks easier.
Four Types Found in Homes:
Four Types Found in Homes:
- Inclined Plane: A sloping ramp used to roll wheelchairs or heavy gas cylinders into vehicles.
- Lever: A seesaw, bottle opener, scissors, or crowbar that pivots on a fixed fulcrum.
- Pulley: A grooved wheel with a rope used to draw water from wells or raise window blinds.
- Wheel and Axle: A door knob, screwdriver, or bicycle pedal.
CBSE Step-by-Step Marking Scheme
Definition of simple machines as force modifiers
1 Mark
Four everyday examples identified
1 Mark
Explanation of leverage reducing input effort
1 Mark
Q6
Suggest five practical habits that a family can adopt to conserve electricity and fuel in daily life.
Energy Conservation
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Five Everyday Energy Conservation Habits:
- Switch to Energy-Efficient LED Lighting: Replace outdated incandescent bulbs with 5-star Bureau of Energy Efficiency (BEE) rated LED bulbs that consume 80% less electricity.
- Turn Off Idling Vehicle Engines: Switch off scooter or car engines at traffic signals when red lights exceed 20 seconds to save fuel and reduce urban exhaust smoke.
- Maximize Natural Daylight: Open window curtains during the daytime to illuminate study desks with natural sunlight instead of turning on electric lamps.
- Unplug Standby Electronics: Switch off television sets, phone chargers, and computers at the wall switch when not in use, preventing 'phantom energy' drain.
- Carpool & Use Public Transit: Walk or ride bicycles for short neighborhood grocery trips, and use school buses or metro trains instead of individual private cars.
CBSE Step-by-Step Marking Scheme
Electricity conservation habits (LEDs, daylight, wall switches)
1.5 Marks
Fuel conservation habits (engine idling, carpooling/cycling)
1.5 Marks
Q7
[Textbook Activity & Question 1] In 'Energy — How Things Work', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Energy — How Things Work
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 2] In 'Energy — How Things Work', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Energy — How Things Work
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 3] In 'Energy — How Things Work', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Energy — How Things Work
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 4] In 'Energy — How Things Work', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Energy — How Things Work
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 5] In 'Energy — How Things Work', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Energy — How Things Work
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 6] In 'Energy — How Things Work', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Energy — How Things Work
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 7] In 'Energy — How Things Work', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Energy — How Things Work
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 8] In 'Energy — How Things Work', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Energy — How Things Work
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 9] In 'Energy — How Things Work', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Energy — How Things Work
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 10] In 'Energy — How Things Work', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Energy — How Things Work
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 11] In 'Energy — How Things Work', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Energy — How Things Work
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 12] In 'Energy — How Things Work', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Energy — How Things Work
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 13] In 'Energy — How Things Work', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Energy — How Things Work
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 14] In 'Energy — How Things Work', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Energy — How Things Work
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 15] In 'Energy — How Things Work', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Energy — How Things Work
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 16] In 'Energy — How Things Work', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Energy — How Things Work
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Energy — How Things Work, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
School Energy Audit & Rooftop Solar Transition Blueprint
Case Scenario: During a campus sustainability meeting, the electricity meter showed that the school consumed 1,800 units of grid electricity monthly, incurring high utility bills while coal-fired power plants generated this power 200 km away.
Analytical Task: Develop an energy-saving blueprint for the school, detailing immediate zero-cost behavioural changes and a proposal for installing a 10 kW grid-tied rooftop solar photovoltaic system.
School Energy Transition & Solar Blueprint:
- Phase 1: Zero-Cost Behavioral Measures (Immediate 15% Reduction):
- Designate a student 'Green Monitor' in every section responsible for turning off fans and lights during lunch breaks and outdoor games.
- Clean dust off ceiling fan blades and window panes quarterly to maximize ventilation and natural illumination.
- Set air conditioner thermostats in teacher staffrooms to a mandatory 24°C–25°C instead of power-hungry 18°C.
- Phase 2: 10 kW Rooftop Solar PV System:
- Installation: Mount 25 polycrystalline solar panels on the unshaded cafeteria flat roof.
- Inverter & Net Metering: Solar panels convert sunlight into DC electricity, which an inverter converts into AC power to run classroom lights and computers. A bidirectional 'Net Meter' sends excess electricity generated on Sundays back to the government grid for credit.
- Environmental Payback: The 10 kW system generates ~40 units of clean electricity daily, offsetting approximately 12 tonnes of carbon dioxide emissions annually.
CBSE Assessment Rubric: 2 Marks for behavioral zero-cost conservation steps + 3 Marks for technical solar PV net-metering proposal and carbon reduction metrics = 5 Marks
8
Unit 4: Things Around Us • Class 5 EVS (New NEP 2020)
Chapter 8: Clothes — How Things are Made
Tracing the journey of textiles: natural plant and animal fibres, spinning, handloom weaving, dyeing traditions, and sustainable clothing
Chapter Highlights, Environmental Insights & Scientific Ideas
- Why We Wear Clothes: Garments provide thermoregulation, protection against extreme weather, safety in diverse occupations, hygiene, and cultural expression.
- Classification of Fibres: Natural plant fibres (Cotton from seed bolls, Jute from stems, Linen from flax), Natural animal fibres (Wool from sheep/goats, Silk from silkworm cocoons), and Synthetic chemical fibres (Nylon, Polyester, Acrylic made from petrochemicals).
- The Journey of Cotton Cloth: Farm harvesting → Ginning (separating cotton seeds from fluffy lint) → Spinning (twisting fibres into continuous yarn on charkhas or mill spindles) → Weaving (interlacing horizontal weft and vertical warp threads on looms) → Dyeing & Printing → Tailoring into garments.
- Sericulture (Silk Production): Cultivating mulberry silkworms (*Bombyx mori*), feeding them leaves, harvesting silken cocoons, boiling to soften sericin gum, and reeling continuous silk filaments.
- Traditional Handlooms of India: Celebrated regional handloom fabrics—Khadi (homespun cotton), Chanderi (Madhya Pradesh), Kanjeevaram (Tamil Nadu), Banarasi (Uttar Pradesh), and Bandhani tie-dye (Gujarat/Rajasthan).
- Sustainable Fashion & the 3Rs: Reducing synthetic microplastic pollution by choosing natural textiles, mending torn garments, and donating outgrown clothes.
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
Trace the complete step-by-step journey of a cotton shirt from a cotton field to a garment shop.
Industrial & Agricultural Process
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
The complete journey of a cotton garment involves six key stages:
- Cultivation & Harvesting: Cotton crops grow best in black clay soil and warm sunshine. When ripe, fluffy white cotton bolls burst open and are handpicked by farmers.
- Ginning: Picked cotton contains seeds and dirt. A ginning machine separates raw cotton fibres (lint) from cotton seeds.
- Spinning: Raw lint is combed, drawn out, and twisted into long continuous threads called yarn using spindles, charkhas, or industrial spinning mills.
- Weaving or Knitting: On a handloom or powerloom, two sets of yarn—the warp (lengthwise) and weft (crosswise)—are interlaced at right angles to weave fabric sheets.
- Dyeing, Bleaching & Printing: The plain grey fabric is washed, bleached, colored with dyes, and printed with decorative patterns.
- Stitching (Tailoring) & Packaging: Tailors cut the cloth according to patterns and stitch buttons, collars, and seams into finished shirts sent to retail stores.
CBSE Step-by-Step Marking Scheme
Picking and ginning (seed separation)
1 Mark
Spinning (lint to yarn) and weaving (warp and weft on looms)
1.5 Marks
Dyeing, printing, tailoring, and distribution
1.5 Marks
Q2
Compare natural fibres and synthetic fibres across three characteristics. Give two examples of each.
Material Science
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Comparison of Fibre Types:
| Characteristic | Natural Fibres | Synthetic Fibres |
|---|---|---|
| Source | Obtained directly from plants and animals | Artificially synthesized from petrochemicals |
| Breathability & Comfort | Highly breathable, absorbs sweat, skin-friendly | Less breathable, traps heat, can cause irritation |
| Environmental Impact | 100% Biodegradable; decomposes naturally | Non-biodegradable; sheds microplastics |
| Examples | Cotton, Jute, Wool, Silk | Nylon, Polyester, Acrylic |
CBSE Step-by-Step Marking Scheme
Clear contrast in origin/source and breathability
1.5 Marks
Biodegradability comparison + 2 accurate examples each
1.5 Marks
Q3
How is silk obtained from the silkworm? Describe the cocoon stage and why silkworms need mulberry leaves.
Life Cycles & Sericulture
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
The rearing of silkworms for commercial silk production is called Sericulture:
- Egg to Caterpillar: Female silk moths lay hundreds of eggs that hatch into tiny caterpillars (silkworm larvae).
- Feeding on Mulberry Leaves: The caterpillars have voracious appetites and feed continuously on fresh green mulberry leaves for about 25 to 30 days, growing rapidly in size.
- Spinning the Cocoon: When fully grown, the silkworm swings its head in figure-eight patterns, secreting a liquid protein from salivary glands that hardens on contact with air into a continuous fine silk thread (up to 1,000 metres long). The caterpillar wraps itself completely in this protective oval shell called a cocoon.
- Reeling Silk: The cocoons are placed in boiling water to soften the sticky gum (sericin). Workers unwind the long, lustrous filaments and spin them into silk yarn.
CBSE Step-by-Step Marking Scheme
Role of mulberry leaves in caterpillar growth
1 Mark
Protein filament secretion forming the cocoon
1.5 Marks
Boiling and reeling process explained
1.5 Marks
Q4
What was the symbolic importance of the 'Charkha' (spinning wheel) and 'Khadi' cloth in Mahatma Gandhi's freedom movement?
Historical & Civic Heritage
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
During India's freedom struggle, Mahatma Gandhi promoted Khadi (homespun cotton cloth) and the Charkha as powerful symbols of national self-reliance (Swavalamban) and resistance:
- Boycott of British Mill Cloth: The British Empire exported raw Indian cotton cheaply to English mills in Manchester and sold expensive machine-made clothes back to Indians, ruining native village weavers. Gandhi urged citizens to boycott foreign textiles.
- Economic Empowerment: Spinning on the Charkha provided supplemental income and dignity of labor to impoverished rural villagers.
- Social Equality: When rich and poor, upper and lower castes all wore simple white Khadi, it dissolved social hierarchies and unified the country.
CBSE Step-by-Step Marking Scheme
Economic boycott of foreign British mill textiles
1.5 Marks
Symbol of rural self-reliance and social equality
1.5 Marks
Q5
Hands-on Activity: Inspect clothing labels in your household wardrobe and classify 4 garments by fibre composition and washing instructions.
Practical Consumer Skills
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Household Wardrobe Label Investigation:
| Garment | Fibre Composition | Fibre Class | Care Instruction |
|---|---|---|---|
| School Summer Shirt | 100% Cotton | Plant Natural | Machine wash warm; iron hot |
| Winter Pullover | 100% Pure Wool | Animal Natural | Hand wash cold; dry flat |
| Sports Track Pants | 100% Polyester | Synthetic Chemical | Do not iron hot; quick drying |
| Traditional Kurta | Cotton-Silk Blend | Mixed Natural | Gentle hand wash with mild detergent |
CBSE Step-by-Step Marking Scheme
Identification of 4 distinct garments and fibre tags
1.5 Marks
Accurate classification into natural, synthetic, and blends
1.5 Marks
Q6
Why should we avoid discarding clothes into municipal landfills? Explain how upcycling and donating garments supports the environment.
Environmental Sustainability
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Discarding clothes in landfills creates severe environmental hazards:
- Microplastic Pollution: Synthetic fabrics (polyester, nylon) take up to 200 years to decompose, shedding microplastic fibres into soil and groundwater.
- Wasted Resources: It takes thousands of litres of fresh water and pesticides to cultivate the cotton for a single shirt. Discarding wearable garments wastes these precious natural inputs.
- Upcycling: Old denim jeans and torn bedsheets can be stitched into sturdy vegetable grocery tote bags, aprons, or floor mats.
- Donation: Clean, outgrown clothes should be donated to community shelters, orphanages, or disaster relief drives so other families can benefit.
CBSE Step-by-Step Marking Scheme
Environmental hazards of landfill textiles (microplastics, water wastage)
1.5 Marks
Two practical circular practices: upcycling and donation
1.5 Marks
Q7
[Textbook Activity & Question 1] In 'Clothes — How Things are Made', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Clothes — How Things are Made
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 2] In 'Clothes — How Things are Made', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Clothes — How Things are Made
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 3] In 'Clothes — How Things are Made', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Clothes — How Things are Made
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 4] In 'Clothes — How Things are Made', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Clothes — How Things are Made
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 5] In 'Clothes — How Things are Made', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Clothes — How Things are Made
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 6] In 'Clothes — How Things are Made', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Clothes — How Things are Made
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 7] In 'Clothes — How Things are Made', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Clothes — How Things are Made
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 8] In 'Clothes — How Things are Made', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Clothes — How Things are Made
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 9] In 'Clothes — How Things are Made', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Clothes — How Things are Made
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 10] In 'Clothes — How Things are Made', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Clothes — How Things are Made
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 11] In 'Clothes — How Things are Made', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Clothes — How Things are Made
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 12] In 'Clothes — How Things are Made', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Clothes — How Things are Made
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 13] In 'Clothes — How Things are Made', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Clothes — How Things are Made
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 14] In 'Clothes — How Things are Made', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Clothes — How Things are Made
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 15] In 'Clothes — How Things are Made', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Clothes — How Things are Made
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 16] In 'Clothes — How Things are Made', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Clothes — How Things are Made
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Clothes — How Things are Made, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
Community Upcycling Drive: 'Denim to Tote Bags'
Case Scenario: Every year, children outgrow several pairs of cotton shirts and denim jeans that are tucked away in closets or thrown into domestic garbage bins. The Eco-Club wants to host a zero-waste textile workshop.
Analytical Task: Create a step-by-step blueprint for a student-led 'Denim to Grocery Bag' upcycling initiative to replace single-use plastic shopping bags in your neighborhood.
'Denim to Tote Bag' Upcycling Blueprint:
- Collection Drive: Place labeled collection hampers in school corridors asking students and teachers to donate clean, worn-out denim jeans and cotton trousers.
- Pattern Cutting Workshop: In the craft room, students cut the pant legs into two rectangular panels (approximately 35 cm × 40 cm) and cut 5 cm wide strips from remaining denim for durable shoulder handles.
- Assembly with Sewing Volunteers: With guidance from parent volunteers and craft teachers, students stitch the side and bottom seams using strong cotton thread, securely double-stitching the shoulder straps.
- Eco-Stenciling & Art: Students paint nature-themed motivational messages (e.g. 'Plastic Mukt Bharat' or 'Choose to Reuse') on the bags using water-based acrylic paints.
- Community Distribution: Distribute the completed bags free of charge to shoppers at local vegetable and fruit markets, encouraging them to decline single-use polythene bags.
CBSE Assessment Rubric: 2 Marks for collection and safe mechanical cutting procedures + 3 Marks for stitching, student creative messaging, and community market replacement impact = 5 Marks
9
Unit 5: Our Amazing Planet • Class 5 EVS (New NEP 2020)
Chapter 9: Rhythms of Nature
Investigating planetary day-night cycles, the six Indian seasons, moon phases, animal migration and hibernation, and agricultural calendars
Chapter Highlights, Environmental Insights & Scientific Ideas
- Day and Night Cycles: Caused by Earth's continuous counter-clockwise rotation on its tilted axis once every 24 hours; the hemisphere facing the Sun experiences daylight, while the opposite hemisphere is in night.
- Seasons & Planetary Revolution: Earth's annual 365.25-day revolution around the Sun combined with its constant 23.5° axial tilt causes changing angles of incidence of sunlight, producing seasonal rhythms.
- The Six Indian Seasons (Shad-Ritu): Ancient Indian climatology recognizes six distinct seasons—Vasant (Spring), Grishma (Summer), Varsha (Monsoon), Sharad (Autumn), Hemant (Pre-winter), and Shishir (Winter).
- Moon Phases & Oceanic Tides: The Moon revolves around Earth every 27.3 days (29.5-day synodic lunar cycle), presenting shifting illuminated phases from Amavasya (New Moon) to Purnima (Full Moon); lunar gravity drives oceanic high and low tides.
- Biological Clocks & Animal Adaptations: Diurnal animals hunt during the day; nocturnal animals (owls, bats) have specialized rod-heavy eyes and hearing for night hunting; animals undergo hibernation (winter sleep) or seasonal migration.
- Agricultural Rhythms (Kharif vs Rabi): Farmers align crop planting with monsoon and winter seasons—Kharif crops (rice, maize sown in July) and Rabi crops (wheat, mustard sown in October).
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
What causes the alternating cycle of day and night on Earth? Why is it bright daylight in India when it is night in the United States?
Astronomical Geography
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Cause of Day and Night:
- Earth is a spherical planet that rotates on its imaginary tilted axis from west to east once every 24 hours.
- Because Earth is opaque, sunlight can illuminate only one half of the globe at any given moment.
- The half facing the Sun experiences Day, while the opposite half turned away from sunlight experiences Night.
CBSE Step-by-Step Marking Scheme
Earth's 24-hour axial rotation explained
1.5 Marks
Opposite longitudinal positions of India and USA
1.5 Marks
Q2
Name the six traditional seasons (Shad-Ritu) observed in Indian climatology and describe the climatic features of two of them.
Climatology & Heritage
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
The ancient Indian calendar categorizes the year into Shad-Ritu (Six Seasons):
- Vasant Ritu: Spring (March–April)
- Grishma Ritu: Summer (May–June)
- Varsha Ritu: Monsoon / Rainy Season (July–August)
- Sharad Ritu: Autumn (September–October)
- Hemant Ritu: Pre-winter (November–December)
- Shishir Ritu: Winter / Late Cold (January–February)
- Vasant Ritu (Spring): Mild pleasant temperatures, trees sprout fresh tender green leaves, mango orchards flower (Manjari), and colorful birds sing. It represents rejuvenation and nature's awakening.
- Varsha Ritu (Monsoon): Southwest monsoon winds bring dark rain-bearing clouds, replenishing rivers and drying groundwater, cooling the scorched earth, and prompting farmers to sow Kharif crops like rice.
CBSE Step-by-Step Marking Scheme
Listing all six Indian seasons in correct sequence
2 Marks
Detailed ecological and weather features of two seasons
2 Marks
Q3
Explain how the Moon changes its visible shape from Amavasya (New Moon) to Purnima (Full Moon) over a two-week period.
Lunar Phases
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
The Moon does not produce its own light; it reflects sunlight like a mirror:
- As the Moon orbits Earth every 29.5 days, we see different fractions of its sunlit half from Earth.
- Amavasya (New Moon): The Moon is positioned directly between Earth and the Sun. Its dark, unlit side faces Earth, making it invisible in the night sky.
- Waxing Phase (Shukla Paksha): Over the next 14 days, a slender crescent moon appears, growing wider each night through the First Quarter until a half-moon and gibbous moon are visible.
- Purnima (Full Moon): Earth is situated between the Sun and the Moon. The entire illuminated surface of the Moon directly faces Earth, shining as a complete, glowing circular disk.
- The cycle then reverses during the waning phase (Krishna Paksha) back to New Moon.
CBSE Step-by-Step Marking Scheme
Concept of reflected sunlight and lunar orbital positioning
1.5 Marks
Amavasya (dark side facing Earth) explained
1 Mark
Waxing phases leading to Purnima (fully illuminated face)
1.5 Marks
Q4
Why do certain animals undergo 'hibernation' while birds undergo 'migration'? Give two examples of each.
Animal Behavioral Adaptations
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Both hibernation and migration are behavioral survival adaptations to escape extreme seasonal cold and severe winter food shortages:
1. Hibernation (Winter Sleep):
1. Hibernation (Winter Sleep):
- Animals enter an inactive, dormant state where their body temperature drops, breathing slows, and heart rate falls drastically to conserve energy without feeding.
- Examples: Brown Bears, Frogs, and Siberian Ground Squirrels.
- Animals and birds travel thousands of kilometers from freezing arctic breeding grounds to warmer tropical wetlands where food (seeds, insects, fish) is abundant and waters remain unfrozen.
- Examples: Siberian Cranes and Rosy Starlings migrating to Indian wetlands; Arctic Terns flying from pole to pole.
CBSE Step-by-Step Marking Scheme
Definition and physiological slowdown of hibernation + 2 examples
2 Marks
Definition and long-distance travel of migration + 2 examples
2 Marks
Q5
Differentiate between Kharif crops and Rabi crops. Why do farmers strictly align their sowing calendar with seasonal cycles?
Agricultural Calendars
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Comparison of Crop Cycles:
- Kharif Crops (Monsoon Crops): Sown at the onset of the southwest monsoon in June/July and harvested in September/October. They require high temperatures and abundant water.
Examples: Rice (Paddy), Maize, Cotton, Jowar, and Groundnut. - Rabi Crops (Winter Crops): Sown in October/November after the monsoon retreats and harvested in spring (March/April). They require cool weather for growth and warm sunshine for ripening.
Examples: Wheat, Barley, Mustard, Gram (Chickpea), and Green Peas.
CBSE Step-by-Step Marking Scheme
Kharif crops: monsoon timing, water requirement, examples
1.5 Marks
Rabi crops: winter timing, cool requirement, examples
1.5 Marks
Q6
Observation Task: Identify two diurnal animals and two nocturnal animals. What unique sensory adaptations help nocturnal animals at night?
Sensory Adaptations
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Classification:
- Diurnal Animals (Active by Day): Honeybee, Eagle, Squirrel, Cow.
- Nocturnal Animals (Active by Night): Barn Owl, Flying Bat, Leopard, Cockroach.
- Large Eyes with Tapetum Lucidum: Owls and cats have large pupils and high concentrations of light-sensitive rod cells, plus a reflective layer behind the retina that magnifies faint moonlight.
- Super-Sensitive Hearing & Echolocation: Barn owls have asymmetric ears to pinpoint the rustle of a mouse in complete darkness; bats emit high-frequency ultrasonic clicks (echolocation) to map obstacles and catch flying insects.
CBSE Step-by-Step Marking Scheme
Correct examples of diurnal and nocturnal creatures
1 Mark
Visual adaptations (large pupils, rod cells)
1 Mark
Auditory / echolocation adaptations in bats and owls
1 Mark
Q7
[Textbook Activity & Question 1] In 'Rhythms of Nature', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Rhythms of Nature
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 2] In 'Rhythms of Nature', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Rhythms of Nature
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 3] In 'Rhythms of Nature', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Rhythms of Nature
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 4] In 'Rhythms of Nature', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Rhythms of Nature
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 5] In 'Rhythms of Nature', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Rhythms of Nature
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 6] In 'Rhythms of Nature', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Rhythms of Nature
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 7] In 'Rhythms of Nature', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Rhythms of Nature
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 8] In 'Rhythms of Nature', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Rhythms of Nature
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 9] In 'Rhythms of Nature', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Rhythms of Nature
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 10] In 'Rhythms of Nature', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Rhythms of Nature
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 11] In 'Rhythms of Nature', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Rhythms of Nature
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 12] In 'Rhythms of Nature', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Rhythms of Nature
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 13] In 'Rhythms of Nature', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Rhythms of Nature
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 14] In 'Rhythms of Nature', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Rhythms of Nature
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 15] In 'Rhythms of Nature', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Rhythms of Nature
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 16] In 'Rhythms of Nature', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Rhythms of Nature
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Rhythms of Nature, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
Climate-Resilient Agricultural Calendar for Erratic Monsoons
Case Scenario: Due to changing global climate patterns, farmers in central India observed that monsoon rains arrived 3 weeks late in July followed by unseasonal torrential downpours in late October, damaging traditional standing soyabean and cotton crops.
Analytical Task: As an agricultural advisor, design a climate-resilient farming strategy helping local farmers adapt their cropping patterns to shifting seasonal rhythms.
Climate-Resilient Adaptation Strategy for Farmers:
- Short-Duration & Drought-Tolerant Seed Varieties: Encourage farmers to switch to certified early-maturing, drought-tolerant crop varieties (like pearl millet/bajra and pulses) that require less water and mature in 75–85 days.
- Staggered Nursery Sowing: Instead of direct field broadcasting, raise rice saplings in protected nurseries using drip irrigation, ready to transplant the moment monsoon rains arrive.
- Multi-Cropping & Intercropping: Intercrop pulses (Pigeon pea / Arhar) with millets so that even if erratic rains harm one crop, the other survives, securing household income.
- Farm Ponds (Khet Talab): Excavate lined farm ponds at the lowest gradient of agricultural plots to capture intense torrential runoff, storing water for critical life-saving irrigation during sudden dry spells.
CBSE Assessment Rubric: 2 Marks for drought-tolerant seeds and staggered nursery practices + 3 Marks for intercropping risk mitigation and farm pond rainwater storage = 5 Marks
10
Unit 5: Our Amazing Planet • Class 5 EVS (New NEP 2020)
Chapter 10: Earth — Our Shared Home
Exploring Earth's unique life-supporting conditions, global continents and oceans, transboundary wildlife migrations, and planetary stewardship
Chapter Highlights, Environmental Insights & Scientific Ideas
- The 'Goldilocks' Planet: Earth is the only known planet harboring life because it sits at an optimal distance from the Sun—neither too hot like Venus nor too frozen like Mars—allowing liquid water, breathable oxygen, and a protective ozone shield.
- Global Continents & Oceans: Earth's surface is 71% water and 29% land, divided into seven continents (Asia, Africa, North America, South America, Antarctica, Europe, Australia) and five major oceans (Pacific, Atlantic, Indian, Southern, Arctic).
- Wildlife Without Borders: Transboundary migratory species travel thousands of miles across national borders—such as Olive Ridley Sea Turtles swimming across the Indian Ocean to Odisha's beaches for mass nesting (*Arribada*), and migratory Rosy Starlings.
- Global Interconnectedness: Environmental events are transboundary—burning fossil fuels in one nation accelerates Arctic ice melting, which in turn raises global sea levels and threatens low-lying island communities worldwide.
- Planetary Environmental Threats: Plastic contamination in oceans, industrial deforestation, loss of wildlife corridors, and rising greenhouse gas emissions.
- Vasudhaiva Kutumbakam & Global Stewardship: The timeless Indian philosophy 'The World is One Family' urges humanity to live in harmonious coexistence with all living species, safeguarding Earth for future generations.
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
What unique planetary conditions make Earth the only known planet capable of supporting life?
Planetary Science
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Earth sustains living ecosystems because of four ideal conditions:
- Optimal Habitable Zone (Goldilocks Distance): Earth is situated at an ideal distance from the Sun, creating temperatures that allow water to remain in liquid form rather than boiling off or freezing completely.
- Breathable Atmosphere: Earth's atmosphere contains 21% Oxygen (vital for cellular respiration) and nitrogen, balanced with carbon dioxide needed by plants for photosynthesis.
- Protective Ozone Layer & Magnetic Shield: The stratospheric ozone layer filters out lethal solar ultraviolet (UV) radiation, while Earth's magnetic field deflects dangerous cosmic solar wind particles.
- Abundant Liquid Water: Oceans, rivers, and groundwater drive biological life and moderate planetary climates.
CBSE Step-by-Step Marking Scheme
Optimal distance from Sun permitting liquid water
1 Mark
Oxygen-rich atmosphere and protective ozone/magnetic shields
1 Mark
Abundance of liquid water and climate moderation
1 Mark
Q2
Name the seven continents and five oceans of the world. Which continent is the largest, and which ocean is named after our country?
Global Geography
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
The Seven Continents (in order of land area):
- Asia (The largest and most populous continent on Earth)
- Africa
- North America
- South America
- Antarctica
- Europe
- Australia (Oceania)
- Pacific Ocean (The largest and deepest ocean)
- Atlantic Ocean
- Indian Ocean (The only ocean in the world named after a country—India)
- Southern (Antarctic) Ocean
- Arctic Ocean (The smallest and shallowest ocean)
CBSE Step-by-Step Marking Scheme
Accurate list of all 7 continents + identifying Asia as largest
2 Marks
Accurate list of all 5 oceans + identifying Indian Ocean named after India
2 Marks
Q3
Describe the mass nesting (Arribada) of Olive Ridley sea turtles on the coast of Odisha. Why do they cross thousands of miles of ocean?
Wildlife Migration & Marine Ecology
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
The annual arrival of Olive Ridley Sea Turtles (Lepidochelys olivacea) in Odisha is one of Earth's greatest natural spectacles:
- Long-Distance Oceanic Migration: Adult turtles migrate thousands of kilometres across the Indian Ocean to congregate offshore along the coastal waters of Gahirmatha and Rushikulya in Odisha every winter.
- The Phenomenon of 'Arribada' (Mass Arrival): Over a span of several nights, hundreds of thousands of female turtles crawl ashore simultaneously under moonlit tides. Using their hind flippers, they excavate deep flask-shaped sand pits and lay approximately 100 to 120 soft-shelled eggs each, carefully covering the nests with sand before returning to the sea.
- Biological Marvel: Hatchlings emerge after 45–50 days and scramble guided by the starlight reflection on ocean waves. Years later, grown females navigate back to the exact same beach where they hatched to lay their own eggs.
CBSE Step-by-Step Marking Scheme
Identification of Olive Ridley migration across the Indian Ocean
1.5 Marks
Explanation of Arribada mass nesting in Odisha
1.5 Marks
Hatchling emergence and navigational fidelity to natal beaches
1 Mark
Q4
How does single-use plastic discarded into city drainage canals eventually harm marine life in deep oceans thousands of miles away?
Global Environmental Interconnectedness
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Earth's waterways are interconnected, carrying land-based pollution to the sea:
- Path from City to Ocean: Plastic bottles, wrappers, and bags thrown onto roads are washed into city storm drains by rains, entering local rivers and flowing downstream into the ocean.
- Ingestion and Entanglement: Marine creatures like sea turtles mistake floating plastic bags for jellyfish (their favorite food), choking their digestive tracts. Fish, seals, and seabirds become entangled in discarded nylon fishing nets.
- Breakdown into Microplastics: Over decades, sunlight and wave action fragment plastic into toxic microscopic particles (microplastics). Plankton and small fish ingest these microplastics, transferring toxins up the food chain to large fish and eventually back to humans who eat seafood.
CBSE Step-by-Step Marking Scheme
Drain-to-river-to-sea transport pathway
1 Mark
Direct wildlife impact (mistaken for food, choking, entanglement)
1 Mark
Microplastic bioaccumulation in marine and human food webs
1 Mark
Q5
Map Skill Task: On a world map or globe, identify and define: (a) The Equator, (b) The Northern and Southern Hemispheres, and (c) The Prime Meridian.
Map & Globe Interpretation
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Key Planetary Lines of Reference:
- The Equator (0° Latitude): An imaginary horizontal circle drawn around the exact middle of the Earth, equidistant from the North and South Poles. It divides the Earth into the Northern Hemisphere and Southern Hemisphere.
- Northern & Southern Hemispheres:
- Northern Hemisphere: The half of Earth lying north of the Equator (contains India, Asia, Europe, and North America).
- Southern Hemisphere: The half of Earth lying south of the Equator (contains Australia, Antarctica, and major parts of South America and Africa).
- The Prime Meridian (0° Longitude): An imaginary vertical line running from the North Pole to the South Pole passing through Greenwich, England. It serves as the baseline for global standard time zones.
CBSE Step-by-Step Marking Scheme
Equator definition (0° latitude) dividing hemispheres
1 Mark
Northern and Southern hemisphere distinctions with continental examples
1 Mark
Prime Meridian definition (0° longitude) through Greenwich
1 Mark
Q6
What does the ancient Indian philosophical concept 'Vasudhaiva Kutumbakam' teach humanity about environmental stewardship?
Ethics & Global Citizenship
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Vasudhaiva Kutumbakam (वसुधैव कुटुम्बकम्): Sourced from the ancient *Maha Upanishad*, this Sanskrit verse translates to 'The World is One Family'.
Lessons for Environmental Stewardship:
Lessons for Environmental Stewardship:
- Universal Kinship Beyond Borders: It teaches that all human beings, animals, birds, forests, and oceans are inextricably linked members of a single planetary family sharing one common home.
- Living in Harmony with Nature: Instead of exploiting nature as commodities, humanity must act as humble caretakers (stewards), ensuring that development does not poison the air, water, or soil that other species rely on.
- Collective Global Responsibility: Global challenges like climate change, ocean acidification, and pandemics cannot be solved by one country alone; all nations must collaborate as one family to protect planet Earth.
CBSE Step-by-Step Marking Scheme
Sanskrit origin and literal translation 'The World is One Family'
1 Mark
Ethical lesson on harmony with non-human living species
1 Mark
Global collaboration for planetary protection
1 Mark
Q7
[Textbook Activity & Question 1] In 'Earth — Our Shared Home', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Earth — Our Shared Home
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 2] In 'Earth — Our Shared Home', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Earth — Our Shared Home
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 3] In 'Earth — Our Shared Home', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Earth — Our Shared Home
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 4] In 'Earth — Our Shared Home', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Earth — Our Shared Home
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 5] In 'Earth — Our Shared Home', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Earth — Our Shared Home
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 6] In 'Earth — Our Shared Home', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Earth — Our Shared Home
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 7] In 'Earth — Our Shared Home', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Earth — Our Shared Home
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 8] In 'Earth — Our Shared Home', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Earth — Our Shared Home
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 9] In 'Earth — Our Shared Home', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Earth — Our Shared Home
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 10] In 'Earth — Our Shared Home', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Earth — Our Shared Home
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 11] In 'Earth — Our Shared Home', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Earth — Our Shared Home
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 12] In 'Earth — Our Shared Home', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Earth — Our Shared Home
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 13] In 'Earth — Our Shared Home', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Earth — Our Shared Home
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 14] In 'Earth — Our Shared Home', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Earth — Our Shared Home
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 15] In 'Earth — Our Shared Home', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Earth — Our Shared Home
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 16] In 'Earth — Our Shared Home', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Earth — Our Shared Home
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Earth — Our Shared Home, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
Youth Planetary Action Charter for a Zero-Waste, Net-Zero School
Case Scenario: During World Environment Day, students learned that humanity currently consumes ecological resources 1.7 times faster than Earth's ecosystems can naturally regenerate, leading to severe biodiversity loss and plastic-filled oceans.
Analytical Task: Author a 5-point 'Youth Planetary Action Charter' that your school community will pledge to adopt to protect Earth as our shared home.
Youth Planetary Action Charter for Earth:
- Pledge for Single-Use Plastic Elimination: We pledge to completely eliminate single-use plastic water bottles, straws, and polybags on our school campus, opting exclusively for reusable, washable alternatives.
- Pledge for Energy & Water Conservation: We pledge to turn off all electrical appliances when leaving rooms and report running taps immediately, reducing our school's carbon and water footprint.
- Pledge for Biodiversity Protection: We pledge to plant and nurture at least five indigenous trees every year in our school or neighbourhood, creating safe mini-habitats for birds, butterflies, and squirrels.
- Pledge for Mindful Food Consumption: We pledge to respect farmers and the Earth by taking only what we can finish on our plates, ensuring zero food waste enters municipal landfills.
- Pledge for Spreading Environmental Awareness: We pledge to educate our families and neighbors about waste segregation, sustainable public transport, and the timeless principle of Vasudhaiva Kutumbakam.
CBSE Assessment Rubric: 2 Marks for practical school-level resource commitments (plastic ban, energy saving) + 3 Marks for biodiversity, food ethics, and community awareness leadership = 5 Marks
1
Animal Senses • Class 5 EVS (Classic CBSE)
Chapter 1: Super Senses
Animal Senses, Communication, Sensory Adaptations, Tiger Conservation & Sanctuaries
Chapter Highlights, Environmental Insights & Scientific Ideas
- Animals have amazing senses: sights, sounds, smells, and taste far exceeding human capabilities.
- Ants leave behind a chemical scent (pheromones) to guide other ants in a continuous single file.
- Silk moth can detect its female partner from many kilometres away by her distinct scent.
- Dogs mark their own territory with urine and faeces; they sniff out intruders by their scent.
- Birds have eyes on opposite sides of their heads, giving them wide panoramic vision; birds like eagles and kites can see 4 times further than humans.
- Night animals like owls and bats see mostly in black and white.
- Tigers possess acute hearing (rotating ears), night vision 6 times sharper than humans, and sensitive whiskers that detect minute vibrations in air.
- National Parks like Jim Corbett (Uttarakhand) and Ghana (Bharatpur, Rajasthan) protect endangered species from hunting and poaching.
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
How did the ant recognize its friend and identify that other ants did not belong to its own group?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Ants identify their group members primarily through their extraordinary sense of smell. As ants walk, they secrete specific chemical substances called pheromones on the ground. Each colony has a distinct chemical signature. When an unfamiliar ant approaches, the guard ant uses its antennae (feelers) to detect the scent and immediately recognizes whether the newcomer belongs to its own nest or is an outsider.
CBSE Step-by-Step Marking Scheme
Mention of chemical scent / pheromones
1 Mark
Role of antennae as sensory smell organs
1 Mark
Explanation of distinct colony scent recognition
1 Mark
Q2
Why do dogs sniff everywhere along the road? What does a dog deduce by sniffing another dog's urine or faeces?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Dogs mark out their own territory on streets by urinating or defecating at specific posts, poles, and corners. A dog can instantly deduce whether another dog has entered its territory by sniffing the scent left in urine and faeces. The scent reveals whether the intruder is a male or female, familiar or a stranger, and how recently it passed through that area.
CBSE Step-by-Step Marking Scheme
Concept of territorial marking by urination/defecation
1 Mark
Identification of intruder via scent detection
1 Mark
Information extracted (gender, freshness, familiarity)
1 Mark
Q3
Most birds have their eyes fixed on opposite sides of their heads. How does this eye placement help them, and why do they frequently move their necks?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Because most birds have eyes positioned on opposite sides of their heads, their eyes can focus on two completely different objects simultaneously, providing a wide panoramic field of view to spot predators and food. However, because their eyeballs cannot rotate within their sockets (they are fixed), birds must turn their whole head and neck to look directly in front or focus closely on a single object.
CBSE Step-by-Step Marking Scheme
Wide panoramic vision covering two directions
1.5 Marks
Fixed eyeballs requiring neck movement to change focal angle
1.5 Marks
Q4
Name five animals whose ears can be seen clearly and five animals whose ears are hidden under feathers or skin.
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
- Animals with visible external ears (pinnae): Elephant, Cow, Dog, Cat, Horse, Deer, Rabbit.
- Animals with hidden ears (internal ear holes): Snake (feels vibrations through the ground), Lizard, Pigeon, Sparrow, Crocodile, Crow.
CBSE Step-by-Step Marking Scheme
Accurate list of 5 animals with visible pinnae
1.5 Marks
Accurate list of 5 animals with hidden ear holes
1.5 Marks
Q5
How does a tiger use its different senses (whiskers, ears, night vision) to hunt efficiently in the wild?
Textbook Exercise
5 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
The tiger is one of the most alert predators on Earth due to its integrated super senses:
- Sensitive Whiskers (Vibrissae): The whiskers are extremely sensitive to air movements and vibrations. They help the tiger navigate safely in complete pitch darkness and locate hidden prey moving through grass.
- Acute Directional Hearing: A tiger's ears can rotate independently in different directions to catch the faintest sound from far away. It can distinguish between the rustling of leaves and an animal walking on grass.
- Super Night Vision: A tiger's night vision is six times sharper than human night vision, allowing it to ambush prey seamlessly after dusk.
- Roar Communication: A tiger's roar can be heard up to 3 kilometres away.
CBSE Step-by-Step Marking Scheme
Sensory role of whiskers in vibration detection
1.5 Marks
Rotational ears and sound distinction capability
1.5 Marks
6x sharper night vision than humans
1 Mark
Summary of predatory efficiency and territory calls
1 Mark
Q6
[Textbook Activity & Question 1] In 'Super Senses', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Super Senses
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q7
[Textbook Activity & Question 2] In 'Super Senses', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Super Senses
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 3] In 'Super Senses', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Super Senses
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 4] In 'Super Senses', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Super Senses
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 5] In 'Super Senses', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Super Senses
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 6] In 'Super Senses', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Super Senses
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 7] In 'Super Senses', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Super Senses
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 8] In 'Super Senses', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Super Senses
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 9] In 'Super Senses', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Super Senses
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 10] In 'Super Senses', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Super Senses
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 11] In 'Super Senses', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Super Senses
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 12] In 'Super Senses', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Super Senses
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 13] In 'Super Senses', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Super Senses
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 14] In 'Super Senses', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Super Senses
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 15] In 'Super Senses', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Super Senses
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 16] In 'Super Senses', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Super Senses
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 17] In 'Super Senses', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Super Senses
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Super Senses, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
Wildlife Conservation & Anti-Poaching Framework
Case Scenario: Due to poaching for tiger skins, bones, and elephant tusks, wild animal populations experienced steep declines. In response, the Government of India declared several forested regions as protected National Parks and Sanctuaries where human interference, hunting, and grazing are strictly prohibited.
Analytical Task: Name two renowned National Parks in India and explain why the government strictly prohibits hunting and woodcutting within their core boundaries.
Two famous National Parks in India are:
1. Jim Corbett National Park in Uttarakhand (India's oldest national park, famous for Bengal Tigers).
2. Kaziranga National Park in Assam (famous for the Great Indian One-Horned Rhinoceros).
Reasons for strict legal prohibition:
- Protection from Extinction: Poachers kill tigers for their skins, claws, and bones, and elephants for their ivory tusks. Strict laws prevent species extinction.
- Preserving Ecological Balance: If apex predators like tigers disappear, herbivore populations explode, destroying vegetation and collapsing the food web.
- Habitat Restoration: Tree cutting degrades the natural ecosystem that wild animals depend on for breeding, shelter, and water.
CBSE Assessment Rubric: 2 Marks for naming National Parks + 3 Marks for ecological and anti-poaching rationale = 5 Marks
2
Kalbeliyas • Class 5 EVS (Classic CBSE)
Chapter 2: A Snake Charmer's Story
Kalbeliyas, Indian Snakes, Venom, Fangs, Antivenom & Wildlife Laws
Chapter Highlights, Environmental Insights & Scientific Ideas
- The Kalbeliya community shares a cultural and traditional bond with snakes, passing down knowledge across generations.
- Musical instruments used by snake charmers: Been, Tumba, Khanjiri, and Dhol.
- Out of hundreds of snake species in India, only four varieties are dangerously poisonous: Cobra (नाग), Common Krait (करैत), Russell's Viper (दुबोइया), and Saw-scaled Viper (अफ़ई).
- Poisonous snakes have two hollow fangs through which venom enters the bloodstream when they bite.
- Snake venom medicine (antivenom) is manufactured directly from the venom of the snakes themselves and is stocked in government hospitals.
- Snakes are friends of farmers: they eat rats in fields and prevent crop destruction.
- The Wildlife Protection Act made it illegal to catch and keep wild animals, prompting snake charmers to adapt into musical performers and educators.
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
Why are snakes described as 'friends of farmers'? What would happen to crops if all snakes were removed from agricultural fields?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Snakes are beneficial friends of farmers because they eat rats and mice in agricultural fields. Rats reproduce rapidly and destroy standing grains, roots, and stored food. If all snakes were killed or removed, the rodent population would explode uncontrollable, resulting in massive destruction of food crops and widespread agricultural losses.
CBSE Step-by-Step Marking Scheme
Identification of snakes as rodent predators
1.5 Marks
Consequence of snake removal on food crops and farmer livelihood
1.5 Marks
Q2
How many types of poisonous snakes are found in India? Name each of them and state how snake venom enters a victim's body.
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Out of the numerous snake species found across India, only four varieties are venomous:
- Cobra (नाग)
- Common Krait (करैत)
- Russell's Viper (दुबोइया)
- Saw-scaled Viper (अफ़ई)
CBSE Step-by-Step Marking Scheme
Correct number (4) and names of all four venomous snakes
2 Marks
Explanation of fangs as hollow injection needles
2 Marks
Q3
How is snake antivenom (the medicine for snake bites) prepared, and where can people find it during an emergency?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Snake antivenom is made directly from snake venom itself. Small, controlled doses of snake venom are collected by extracting it from live snakes. It is then injected into animals like horses to produce antibodies, which are purified into antivenom serum. Snake bite antivenom is available at all government primary healthcare centres and district hospitals across the country.
CBSE Step-by-Step Marking Scheme
Explanation that antivenom is manufactured from snake venom
1.5 Marks
Availability in government hospitals & health centres
1.5 Marks
Q4
What law did the government enact regarding wild animals, and what dilemma did it create for the Kalbeliya community?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
The Indian government enacted the Wildlife Protection Act, which makes it illegal to catch, keep, or sell wild animals, including snakes.
Dilemma for Kalbeliyas: Snake charming was the traditional profession and sole source of livelihood for Kalbeliya families. The ban suddenly took away their source of income. To adapt, many Kalbeliyas have preserved their cultural heritage by transitioning into folk dancers, musical performers, and wildlife education guides.
Dilemma for Kalbeliyas: Snake charming was the traditional profession and sole source of livelihood for Kalbeliya families. The ban suddenly took away their source of income. To adapt, many Kalbeliyas have preserved their cultural heritage by transitioning into folk dancers, musical performers, and wildlife education guides.
CBSE Step-by-Step Marking Scheme
Statement of the Wildlife Protection law prohibiting capture
1.5 Marks
Impact on Kalbeliya livelihood and cultural adaptation
1.5 Marks
Q5
[Textbook Activity & Question 1] In 'A Snake Charmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • A Snake Charmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q6
[Textbook Activity & Question 2] In 'A Snake Charmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • A Snake Charmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q7
[Textbook Activity & Question 3] In 'A Snake Charmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • A Snake Charmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 4] In 'A Snake Charmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • A Snake Charmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 5] In 'A Snake Charmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • A Snake Charmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 6] In 'A Snake Charmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • A Snake Charmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 7] In 'A Snake Charmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • A Snake Charmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 8] In 'A Snake Charmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • A Snake Charmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 9] In 'A Snake Charmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • A Snake Charmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 10] In 'A Snake Charmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • A Snake Charmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 11] In 'A Snake Charmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • A Snake Charmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 12] In 'A Snake Charmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • A Snake Charmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 13] In 'A Snake Charmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • A Snake Charmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 14] In 'A Snake Charmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • A Snake Charmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 15] In 'A Snake Charmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • A Snake Charmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 16] In 'A Snake Charmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • A Snake Charmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 17] In 'A Snake Charmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • A Snake Charmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 18] In 'A Snake Charmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • A Snake Charmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Snake Charmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
Emergency Response to Snake Bites
Case Scenario: While working in a paddy field during the monsoon, a farmer was bitten on the ankle by a snake. Some villagers suggested cutting the wound with a blade and sucking out the blood, while a school teacher insisted on taking him directly to the district hospital.
Analytical Task: Explain why traditional myths like cutting the wound or sucking venom are dangerous, and list the correct scientific first-aid steps for snake bite.
Why cutting or sucking the wound is hazardous:
Cutting tissue causes severe bleeding, tissue damage, and life-threatening infections. Sucking venom is ineffective because venom spreads swiftly into the lymphatic system and blood, while putting the rescuer at risk of poisoning through mouth cuts.
Correct Scientific First Aid Protocol:
1. Keep the patient calm and still: Any panic, running, or movement speeds up heart rate, accelerating venom distribution.
2. Immobilize the bitten limb: Keep the bitten leg or arm below heart level and apply a clean, broad splint (like a wooden stick or cloth bandage) to prevent movement.
3. Remove tight items: Remove rings, bangles, or tight shoes before swelling occurs.
4. Rush to a hospital immediately: The only effective cure is intravenous administration of Polyvalent Antivenom Serum at a medical facility.
CBSE Assessment Rubric: 2 Marks for debunking harmful myths + 3 Marks for 4 correct first-aid steps = 5 Marks
3
Taste Buds • Class 5 EVS (Classic CBSE)
Chapter 3: From Tasting to Digesting
Taste Buds, Salivary Digestion, Stomach Acid, Dr. Beaumont's Discovery & Balanced Nutrition
Chapter Highlights, Environmental Insights & Scientific Ideas
- Different parts of our tongue detect different primary tastes: sweet, salty, sour, and bitter.
- Digestion begins in the mouth: chewing food thoroughly mixes it with saliva, where enzymes break down complex starch into simple sweet sugars.
- Dr. William Beaumont conducted historic experiments on soldier Alexis St. Martin (who had an unhealed stomach gunshot wound), proving that the stomach churns food and secretes digestive juices.
- Stomach juices are strongly acidic in nature.
- Food takes roughly 1.5 to 4.5 hours to digest in the stomach depending on whether it is boiled milk, raw eggs, or cooked meat.
- Proper food (संतुलित आहार) is the fundamental right of every child: malnutrition (undernourishment) causes weakness, while fast junk food leads to obesity and lethargy.
- Kalahandi district in Odisha exports large quantities of rice, yet many poor labourers and children there suffer from extreme starvation and poverty.
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
Why are we advised to chew our food 30 to 32 times before swallowing? What change in taste occurs when plain chapati or boiled rice is chewed for a long time?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Chewing food 30 to 32 times breaks solid food into fine particles and thoroughly mixes it with saliva secreted by salivary glands. Saliva contains the enzyme ptyalin (amylase), which chemically converts complex, tasteless starch molecules into simple sugars (maltose/glucose). When boiled rice or plain chapati is chewed for a prolonged period, it begins to taste noticeably sweet.
CBSE Step-by-Step Marking Scheme
Physical breakdown and thorough saliva mixing
1 Mark
Enzymatic conversion of starch to sugar
1 Mark
Taste transformation to sweet
1 Mark
Q2
Who was Alexis St. Martin and how did Dr. William Beaumont use his medical condition to unlock the secrets of human digestion?
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
In 1822, a soldier named Alexis St. Martin was accidentally shot in the stomach. Dr. William Beaumont treated the wound, and although St. Martin recovered, the wound healed leaving an open fistula (a hole) covered by a loose flap of skin that allowed Dr. Beaumont to peer directly inside a living human stomach.
Key Discoveries by Dr. Beaumont:
Key Discoveries by Dr. Beaumont:
- The stomach churns food vigorously to break it down.
- The stomach secretes acidic digestive juices.
- Digestion occurs significantly faster inside the warm, living stomach than when the same digestive juices are placed in a glass test tube outside the body.
- Mental distress or sadness slows down the digestive process.
CBSE Step-by-Step Marking Scheme
Explanation of St. Martin's stomach window condition
1.5 Marks
Discovery of stomach churning and digestive juices
1.5 Marks
Comparison of in-vivo vs in-vitro digestion rates
1 Mark
Q3
Why is a glucose drip given to a patient who is suffering from severe vomiting and loose motions?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
When a person suffers from continuous vomiting and diarrhoea (loose motions), the body loses huge amounts of water, essential salts, and glucose, leading to severe dehydration and weakness. The stomach cannot retain or digest oral food. A glucose drip is administered directly into the patient's bloodstream through an intravenous (IV) line, providing instant energy and rehydration without requiring the digestive system to work.
CBSE Step-by-Step Marking Scheme
Explanation of dehydration and nutrient loss from vomiting
1.5 Marks
Direct IV absorption providing instant energy without digestion
1.5 Marks
Q4
Compare the health conditions of Rashmi (3 years old, undernourished) and Kailash (7 years old, obese on junk food). What defines 'Proper Food'?
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
- Rashmi (Undernutrition): Looks much younger than her age, has very thin arms and legs and a bloated pot-belly. She falls sick often because she does not get even one full meal of rice or roti a day.
- Kailash (Malnutrition from Junk Food): He is overweight, chubby, and experiences pain in his legs. He finds it difficult to run or walk fast, prefers watching TV, and refuses home-cooked lentils, vegetables, and rice in favour of chips, burgers, and soft drinks.
CBSE Step-by-Step Marking Scheme
Accurate contrast between undernourished vs junk food conditions
2 Marks
Comprehensive definition of proper balanced diet
2 Marks
Q5
[Textbook Activity & Question 1] In 'From Tasting to Digesting', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • From Tasting to Digesting
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q6
[Textbook Activity & Question 2] In 'From Tasting to Digesting', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • From Tasting to Digesting
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q7
[Textbook Activity & Question 3] In 'From Tasting to Digesting', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • From Tasting to Digesting
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 4] In 'From Tasting to Digesting', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • From Tasting to Digesting
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 5] In 'From Tasting to Digesting', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • From Tasting to Digesting
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 6] In 'From Tasting to Digesting', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • From Tasting to Digesting
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 7] In 'From Tasting to Digesting', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • From Tasting to Digesting
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 8] In 'From Tasting to Digesting', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • From Tasting to Digesting
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 9] In 'From Tasting to Digesting', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • From Tasting to Digesting
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 10] In 'From Tasting to Digesting', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • From Tasting to Digesting
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 11] In 'From Tasting to Digesting', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • From Tasting to Digesting
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 12] In 'From Tasting to Digesting', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • From Tasting to Digesting
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 13] In 'From Tasting to Digesting', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • From Tasting to Digesting
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 14] In 'From Tasting to Digesting', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • From Tasting to Digesting
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 15] In 'From Tasting to Digesting', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • From Tasting to Digesting
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 16] In 'From Tasting to Digesting', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • From Tasting to Digesting
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 17] In 'From Tasting to Digesting', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • From Tasting to Digesting
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 18] In 'From Tasting to Digesting', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • From Tasting to Digesting
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In From Tasting to Digesting, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
The Kalahandi Hunger Paradox
Case Scenario: In Kalahandi district in Odisha, plenty of rice is cultivated and sent to other states, with rich farmers making substantial profits. In the same district, however, many landless families and children die of hunger and starvation due to lack of purchasing power.
Analytical Task: Why does starvation persist in a region that produces surplus rice, and what government policies are designed to guarantee food security to every child?
Reasons for the Paradox:
1. Lack of Purchasing Power: Poor tribal and agricultural labourers do not own land and earn very low daily wages, leaving them unable to buy market rice even when grain warehouses are full.
2. Grain Hoarding & Inefficient Distribution: Rice is often hoarded by middlemen or exported for commercial profit rather than distributed equitably.
Government Countermeasures:
- Public Distribution System (PDS / Ration Shops): Provides subsidized food grains to below-poverty-line (BPL) families.
- PM POSHAN (Mid-Day Meal Scheme): Guarantees at least one freshly cooked, nutritious, hot meal every school day to all primary school students.
- Antyodaya Anna Yojana (AAY): Supplies highly subsidized rice and wheat to the poorest of the poor households.
CBSE Assessment Rubric: 2 Marks for root cause analysis + 3 Marks for government welfare schemes = 5 Marks
4
Food Spoilage • Class 5 EVS (Classic CBSE)
Chapter 4: Mangoes Round the Year
Food Spoilage, Food Preservation, Bread Mould Experiment & Making Mamidi Tandra
Chapter Highlights, Environmental Insights & Scientific Ideas
- Difference between food spoilage (decay caused by microorganisms) and food wasting (preparing excess food and throwing it away).
- Factors causing food spoilage: moisture, warmth, air, bacteria, and fungal spores.
- Bread mould (fungus) grows visibly over 6 days when bread is kept moist in a closed box.
- Traditional preservation techniques: boiling, drying in sunlight, pickling with salt and mustard oil, keeping in sugar syrup (Murabba).
- Mamidi Tandra (Aam Papad) is prepared in Andhra Pradesh using ripe mango pulp, jaggery, and sugar, dried layer by layer under the sun over four weeks.
- Information on packed food labels: expiry date, manufacturing date, ingredients, net weight, and maximum retail price (MRP).
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
How can you tell by looking, smelling, or touching whether a food item has spoiled? Describe the bread mould experiment.
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
We can detect food spoilage through several clear indicators:
- Smell: Spoiled food emits a foul, sour, or pungent odour.
- Appearance & Colour: Greenish, white, or black fuzzy spots of fungus appear on the surface.
- Touch & Texture: The food becomes slimy, sticky, excessively soft, or discoloured.
CBSE Step-by-Step Marking Scheme
Listing smell, colour, and texture indicators of spoilage
1.5 Marks
Detailed 6-day observation progression of bread mould
2.5 Marks
Q2
Explain step-by-step how Mamidi Tandra (Aam Papad) is prepared from ripe mangoes in Atreyapuram, Andhra Pradesh.
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
The traditional preparation of Mamidi Tandra requires four weeks of dedication and hot sunny weather:
- Extracting Pulp: Fully ripe mangoes are selected, washed, peeled, and crushed to extract sweet pulp. The pulp is strained through a fine cloth to remove fibrous strands.
- Adding Sugar & Jaggery: Crushed jaggery and sugar in equal amounts are thoroughly stirred into the pulp until dissolved.
- Spreading the Layer: A mat woven from palm leaves is tied onto poles in a sunny yard. A thin layer of the sweet mango pulp is spread evenly on the mat and left to dry in the blazing sun all day.
- Building Thickness: At sunset, the mat is covered with a clean sari to keep dust off. Next day, another layer of pulp is poured over the previous layer. This process is repeated daily for 4 weeks until the golden jelly slab grows about 4 cm thick.
- Cutting into Pieces: The solidified dried sheet is peeled off the mat and sliced into gleaming square pieces.
CBSE Step-by-Step Marking Scheme
Pulp extraction and filtration
1 Mark
Addition of jaggery and sugar
1 Mark
Layer-by-layer sun drying over 4 weeks
1.5 Marks
Final cutting into jelly cakes
0.5 Mark
Q3
Why is it important to check the date of expiry, manufacturing date, and ingredient list before buying packaged food items from the market?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Checking food package labels is critical for consumer health and safety:
- Expiry Date / Best Before: Indicates the final date after which the food is no longer safe for consumption and could cause severe food poisoning.
- Manufacturing Date: Informs the buyer how fresh the product is.
- Ingredients: Helps buyers check for allergens (nuts, gluten, dairy), excess preservatives, artificial colours, or unhealthy sugars.
- MRP (Maximum Retail Price): Ensures the shopkeeper does not overcharge the customer.
CBSE Step-by-Step Marking Scheme
Importance of Expiry date for preventing food poisoning
1.5 Marks
Significance of manufacturing date and ingredients
1.5 Marks
Q4
What is the difference between food spoiling and food wasting? Give real-life examples of both.
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
- Food Spoiling: Occurs when cooked or raw food decays due to microorganisms (bacteria, yeast, mould) or enzymes, becoming unwholesome, foul-smelling, and harmful to consume. Example: Milk turning sour on a hot day or bread developing fungal mould.
- Food Wasting: Occurs when perfectly fresh, wholesome edible food is discarded or left uneaten due to over-purchasing, excess cooking at banquets, or neglect. Example: Leaving half a plate of fresh rice at a wedding feast and throwing it in the garbage bin.
CBSE Step-by-Step Marking Scheme
Definition and example of microbial food spoilage
1.5 Marks
Definition and example of unnecessary food wastage
1.5 Marks
Q5
Name four common food items and describe simple traditional home methods to prevent them from spoiling for a few days.
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Traditional home methods of short-term preservation:
- Milk: Boil it thoroughly 1-2 times daily to kill spoilage bacteria.
- Cooked Rice: Place the bowl in a shallow basin of cold water or store in a refrigerator.
- Green Coriander (Dhaniya): Wrap loosely in a damp, breathable cotton cloth.
- Onion and Garlic: Keep in an open, dry, and well-ventilated basket away from moisture.
CBSE Step-by-Step Marking Scheme
Boiling milk & shallow water basin for rice
2 Marks
Damp cloth for coriander & dry basket for onions
2 Marks
Q6
[Textbook Activity & Question 1] In 'Mangoes Round the Year', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Mangoes Round the Year
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q7
[Textbook Activity & Question 2] In 'Mangoes Round the Year', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Mangoes Round the Year
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 3] In 'Mangoes Round the Year', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Mangoes Round the Year
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 4] In 'Mangoes Round the Year', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Mangoes Round the Year
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 5] In 'Mangoes Round the Year', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Mangoes Round the Year
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 6] In 'Mangoes Round the Year', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Mangoes Round the Year
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 7] In 'Mangoes Round the Year', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Mangoes Round the Year
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 8] In 'Mangoes Round the Year', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Mangoes Round the Year
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 9] In 'Mangoes Round the Year', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Mangoes Round the Year
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 10] In 'Mangoes Round the Year', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Mangoes Round the Year
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 11] In 'Mangoes Round the Year', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Mangoes Round the Year
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 12] In 'Mangoes Round the Year', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Mangoes Round the Year
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 13] In 'Mangoes Round the Year', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Mangoes Round the Year
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 14] In 'Mangoes Round the Year', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Mangoes Round the Year
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 15] In 'Mangoes Round the Year', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Mangoes Round the Year
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 16] In 'Mangoes Round the Year', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Mangoes Round the Year
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 17] In 'Mangoes Round the Year', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Mangoes Round the Year
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Mangoes Round the Year, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
Preservation Principles: Salt, Sugar, and Oil
Case Scenario: Grandmother prepares raw mango pickle in large glass jars filled with mustard oil and salt, which stay fresh for two years without refrigeration. In contrast, fresh mango slices turn black and rot within three days.
Analytical Task: Explain the scientific principle of how heavy salt and oil prevent bacteria and fungi from spoiling pickles.
Scientific Mechanism of Pickling:
1. High Salt Concentration (Osmosis): Salt draws out moisture from bacterial and fungal cells through osmosis. Without water, microorganisms cannot survive or reproduce.
2. Oil Seal (Anaerobic Barrier): The layer of oil floating on top cuts off contact with atmospheric air and oxygen. Most spoilage bacteria and moulds require oxygen to grow; the oil layer chokes them off completely.
3. Acidity of Raw Mangoes: Natural acids in raw mangoes create a low pH environment that naturally inhibits microbial growth.
CBSE Assessment Rubric: 2 Marks for Osmosis principle + 2 Marks for Oil barrier + 1 Mark for Acidity = 5 Marks
5
Seed Germination • Class 5 EVS (Classic CBSE)
Chapter 5: Seeds and Seeds
Seed Germination, Insectivorous Plants, Seed Dispersal Agents & George Mestral's Velcro
Chapter Highlights, Environmental Insights & Scientific Ideas
- A seed contains an embryo (baby plant) and stored cotyledon food protected inside a seed coat.
- Three essential conditions for seed germination: moisture (water), air (oxygen), and warmth (favourable temperature).
- Pitcher Plant (Nepenthes) grows in Meghalaya and traps insects, frogs, and mice to absorb nitrogen in poor soil.
- Seed dispersal mechanisms: Wind (light hairy seeds), Water (spongy buoyant seeds like coconut), Animals (hooked seeds that cling to fur), and Pod Explosion (balsam, pea).
- George Mestral discovered Velcro in 1948 after observing burdock seeds clinging firmly to his dog's fur with microscopic hooks.
- Global journey of crops: Chilli, potato, and tomato came from South America; Coffee and bhindi from Africa; Cabbage and peas from Europe.
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
Describe an experiment to prove that seeds need both air and water to germinate. What happens if a seed receives only water but no air?
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Three-Bowl Chana Experiment:
- Bowl 1 (Water only, No Air): Place 5 chana seeds completely submerged in water. Result: Seeds swell up but do NOT sprout because they lack oxygen.
- Bowl 2 (Both Air and Water): Wrap 5 chana seeds in a damp cotton cloth and keep moist. Result: Seeds sprout healthy white radicles (roots) within 2 days because they receive both moisture and atmospheric oxygen.
- Bowl 3 (Air only, No Water): Keep 5 dry chana seeds in an empty bowl. Result: No sprouting occurs because moisture is absent.
CBSE Step-by-Step Marking Scheme
Detailed description of Bowl 1, Bowl 2, and Bowl 3 conditions
3 Marks
Scientific conclusion on dual necessity of air and moisture
1 Mark
Q2
What is an insectivorous plant? How does the Pitcher Plant (Nepenthes) trap insects, and why does it eat them even though it is green?
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
An insectivorous plant is a green carnivorous plant that traps and digests small insects and animals.
Pitcher Plant (Nepenthes) of Meghalaya:
Pitcher Plant (Nepenthes) of Meghalaya:
- Its leaf blade is modified into a hollow pitcher-like flask covered with a leaf lid.
- The mouth of the pitcher secretes sweet-smelling nectar that attracts flying insects.
- The inner walls are slippery. When an insect lands on the rim, it slips and falls into the digestive liquid at the bottom. The lid snaps shut, trapping the prey.
- Why it eats insects: Although Nepenthes has chlorophyll and performs photosynthesis to make carbohydrates, it grows in nitrogen-deficient, swampy acidic soil. It digests insects to fulfill its essential nitrogen and protein requirements.
CBSE Step-by-Step Marking Scheme
Definition and geographic habitat in Meghalaya
1 Mark
Trap mechanism (scent, slippery rim, lid)
1.5 Marks
Reason for insectivory (nitrogen deficiency in soil)
1.5 Marks
Q3
How did George Mestral get the idea to invent Velcro in 1948? Give three practical everyday uses of Velcro.
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
In 1948, Swiss engineer George Mestral went on a nature walk with his dog. Upon returning, he noticed hundreds of spiky burdock seeds (burrs) stuck firmly to his clothes and his dog's coat. Examining a seed under a microscope, he observed thousands of tiny hooks that clung to the loops of fabric. Inspired by this nature design, he invented Velcro with one side made of tiny hooks and the other side of soft loops.
Everyday uses: Sneakers/shoes, school bags, watch straps, jacket fasteners, blood pressure monitor cuffs.
Everyday uses: Sneakers/shoes, school bags, watch straps, jacket fasteners, blood pressure monitor cuffs.
CBSE Step-by-Step Marking Scheme
Microscopic observation of burdock seeds with hooks
1.5 Marks
Three everyday applications of Velcro
1.5 Marks
Q4
Explain four distinct natural agents of seed dispersal and name two plants for each method.
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Seeds travel to distant places through diverse natural agents:
- By Wind: Seeds are lightweight, small, and equipped with wings, tufts of hair, or parachutes. Examples: Dandelion, Drumstick, Maple, Calotropis (Madar).
- By Water: Seeds possess a spongy, fibrous, water-resistant outer coat that floats easily. Examples: Coconut, Lotus, Water Lily.
- By Animals & Humans: Seeds develop sharp hooks, spines, or sticky burrs that cling to animal fur or human clothing. Examples: Xanthium, Burdock, Urena.
- By Explosive Bursting: Dry fruit pods split open suddenly with a snap, scattering seeds away from the mother plant. Examples: Balsam, Soybean, Pea, Lady's Finger.
CBSE Step-by-Step Marking Scheme
Wind and water dispersal features and examples
2 Marks
Animal hooks and explosive pod mechanisms and examples
2 Marks
Q5
Why is seed dispersal essential for the survival and multiplication of plant species?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
If all seeds of a tree fell directly beneath its parent canopy:
- Seedlings would intensely compete with the parent plant and each other for sunlight, water, soil minerals, and root space.
- Most seedlings would wither and die in the dense shade.
- Seed dispersal ensures plants spread to new geographic regions, establish new colonies, and adapt to diverse climatic conditions.
CBSE Step-by-Step Marking Scheme
Avoiding overcrowding and competition for resources
1.5 Marks
Colonization of new geographic habitats
1.5 Marks
Q6
[Textbook Activity & Question 1] In 'Seeds and Seeds', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Seeds and Seeds
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q7
[Textbook Activity & Question 2] In 'Seeds and Seeds', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Seeds and Seeds
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 3] In 'Seeds and Seeds', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Seeds and Seeds
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 4] In 'Seeds and Seeds', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Seeds and Seeds
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 5] In 'Seeds and Seeds', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Seeds and Seeds
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 6] In 'Seeds and Seeds', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Seeds and Seeds
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 7] In 'Seeds and Seeds', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Seeds and Seeds
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 8] In 'Seeds and Seeds', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Seeds and Seeds
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 9] In 'Seeds and Seeds', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Seeds and Seeds
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 10] In 'Seeds and Seeds', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Seeds and Seeds
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 11] In 'Seeds and Seeds', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Seeds and Seeds
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 12] In 'Seeds and Seeds', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Seeds and Seeds
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 13] In 'Seeds and Seeds', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Seeds and Seeds
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 14] In 'Seeds and Seeds', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Seeds and Seeds
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 15] In 'Seeds and Seeds', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Seeds and Seeds
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 16] In 'Seeds and Seeds', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Seeds and Seeds
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 17] In 'Seeds and Seeds', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Seeds and Seeds
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Seeds and Seeds, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
How Chillies Conquered Indian Kitchens
Case Scenario: Today, spicy chillies are an indispensable ingredient in every Indian kitchen. Yet, five hundred years ago, neither chillies, potatoes, nor tomatoes existed in India.
Analytical Task: From where did chillies come to India, who brought them, and name two other vegetables that originated in Africa.
Origin of Chillies:
Chillies originated in South America. They were brought to India by Portuguese traders who sailed via trade routes from South America to the Malabar coast of India during the late 15th and early 16th centuries.
Other Global Crops:
- From Africa: Coffee beans and Bhindi (Lady's Finger / Okra).
- From South America: Potatoes and Tomatoes.
- From Europe: Cabbage and Green Peas.
CBSE Assessment Rubric: 2 Marks for South America & Portuguese traders + 3 Marks for other global crop origins = 5 Marks
6
Ghadsisar Lake • Class 5 EVS (Classic CBSE)
Chapter 6: Every Drop Counts
Ghadsisar Lake, Stepwells (Baoli), Rainwater Harvesting (Tanka), Al-Biruni's Account & Water Conservation
Chapter Highlights, Environmental Insights & Scientific Ideas
- King Ghadsi of Jaisalmer built the famous Ghadsisar lake 650 years ago, connecting nine lakes that stored rainwater without wasting a single drop.
- Traditional rainwater harvesting: rain falling on sloping roofs flows through pipes into an underground covered tank called a Tanka.
- Stepwells (Bawari / Baoli) feature deep stone steps descending to the water level, allowing travellers and communities to access fresh water.
- Al-Biruni, a traveller from Uzbekistan, praised Indian water engineering, recording how massive stones and iron rods joined to form raised platforms (chabutras) around lakes.
- In modern times, multi-storey buildings and paved asphalt have prevented rain from seeping into the ground, causing groundwater tables to drop drastically.
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
Describe the architectural brilliance of King Ghadsi's Ghadsisar lake in Jaisalmer. How did the nine interconnected lakes prevent water wastage?
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Ghadsisar lake in Jaisalmer was built 650 years ago by King Ghadsi with the help of his people:
- Around the lake were ghats with stone steps, decorated verandas, large halls, and pavilions for festivals and music.
- Interconnected 9-Lake System: The lake was engineered so that when Ghadsisar filled up to its brim with rainwater, the excess water flowed out into another lake at a lower level. When that filled, water overflowed into a third lake, continuing across all nine interconnected lakes.
- Rainwater collected in this system served the desert city throughout the year without letting a single drop go to waste.
CBSE Step-by-Step Marking Scheme
Description of ghats and community pavilions
1 Mark
Detailed explanation of 9 cascading interconnected lakes
2 Marks
Significance for year-round desert water security
1 Mark
Q2
What is a Bawari (Stepwell)? How did stepwells differ from traditional bucket wells?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
A Bawari (Stepwell) is a deep multi-storey stone reservoir with beautiful flights of stone steps leading down directly to the water level.
Difference from ordinary wells: In an ordinary well, people pull water up from above using a rope and bucket. In a stepwell, the people themselves walk down the flights of stairs to reach the water. Stepwells served as community cooling pavilions, rest stops for travelling caravans, and social gathering centres.
Difference from ordinary wells: In an ordinary well, people pull water up from above using a rope and bucket. In a stepwell, the people themselves walk down the flights of stairs to reach the water. Stepwells served as community cooling pavilions, rest stops for travelling caravans, and social gathering centres.
CBSE Step-by-Step Marking Scheme
Definition of a Bawari with descending stone steps
1.5 Marks
Distinction from bucket wells & community cooling role
1.5 Marks
Q3
Explain the rooftop rainwater harvesting system (Tanka) used in the dry desert areas of Rajasthan.
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
In arid regions of Rajasthan, houses are constructed with sloping roofs. Rainwater falling on the clean rooftop flows through a drain pipe down into an underground stone-and-lime chamber called a Tanka constructed in the courtyard. A wire mesh strainer at the pipe mouth filters out leaves and dirt. The tanka is kept covered with a lid to keep the stored water cool and pure for drinking all year.
CBSE Step-by-Step Marking Scheme
Sloping roof and drainage pipe mechanism
1.5 Marks
Underground Tanka construction and filtration sieve
1.5 Marks
Q4
What traditional customs, songs, and rituals were associated with water and rain in ancient Indian villages?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
In ancient and traditional Indian culture, water was revered as a sacred life-giver:
- Whenever a lake or stepwell filled up with fresh monsoon rainwater, villagers gathered in colorful festive clothes to sing celebratory folk songs and dance.
- New brides bowed in worship before the village pond, spring, or family water tap to seek blessings.
- Water reservoirs were surrounded by stone carvings of deities, reminding communities that keeping water clean was a sacred religious duty.
CBSE Step-by-Step Marking Scheme
Celebration of newly filled lakes and community folk songs
1.5 Marks
Customs of worship and cultural ethics of water reverence
1.5 Marks
Q5
Mention four practical water-saving habits every household should adopt to prevent urban water scarcity.
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Four vital water conservation practices:
- Turn off the tap while brushing teeth, washing face, or soaping hands (saves up to 6 litres per minute).
- Repair leaking taps, flush valves, and joint pipes immediately.
- Reuse RO wastewater and vegetable rinse water for mopping floors and watering garden plants.
- Install dual-flush toilet cisterns and water-saving aerator nozzles on household taps.
CBSE Step-by-Step Marking Scheme
Turning off running taps & prompt leak repairs
1.5 Marks
Reusing greywater & modern aerator/dual-flush fittings
1.5 Marks
Q6
[Textbook Activity & Question 1] In 'Every Drop Counts', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Every Drop Counts
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q7
[Textbook Activity & Question 2] In 'Every Drop Counts', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Every Drop Counts
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 3] In 'Every Drop Counts', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Every Drop Counts
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 4] In 'Every Drop Counts', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Every Drop Counts
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 5] In 'Every Drop Counts', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Every Drop Counts
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 6] In 'Every Drop Counts', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Every Drop Counts
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 7] In 'Every Drop Counts', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Every Drop Counts
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 8] In 'Every Drop Counts', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Every Drop Counts
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 9] In 'Every Drop Counts', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Every Drop Counts
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 10] In 'Every Drop Counts', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Every Drop Counts
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 11] In 'Every Drop Counts', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Every Drop Counts
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 12] In 'Every Drop Counts', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Every Drop Counts
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 13] In 'Every Drop Counts', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Every Drop Counts
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 14] In 'Every Drop Counts', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Every Drop Counts
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 15] In 'Every Drop Counts', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Every Drop Counts
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 16] In 'Every Drop Counts', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Every Drop Counts
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 17] In 'Every Drop Counts', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Every Drop Counts
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Every Drop Counts, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
Al-Biruni's Observations on Indian Hydraulic Systems
Case Scenario: More than a thousand years ago, Central Asian scholar Al-Biruni arrived in India and was astonished by the pond-building skills of the Indian people. He wrote that his countrymen would be amazed to see such colossal masonry.
Analytical Task: What specific features of Indian ponds and reservoirs impressed Al-Biruni, and why are modern concrete cities facing severe floods and water shortages simultaneously?
Al-Biruni's Praise:
He admired how Indian builders joined giant stone blocks with iron clamps to construct terraced chabutras (raised platforms) and separate ascending and descending staircases so people would never collide with each other.
Modern Urban Crisis:
Modern cities pave soil with asphalt and concrete. Rain cannot seep into the ground to recharge aquifers, causing storm water to cause flash floods while borewells run completely dry.
CBSE Assessment Rubric: 2 Marks for Al-Biruni's notes + 3 Marks for modern urban runoff analysis = 5 Marks
7
Floating & Sinking • Class 5 EVS (Classic CBSE)
Chapter 7: Experiments with Water
Floating & Sinking, Buoyancy & Density, Dead Sea Salinity & Mahatma Gandhi's Dandi March
Chapter Highlights, Environmental Insights & Scientific Ideas
- Whether an object floats or sinks in water depends on its density and buoyant force (upward thrust of water).
- An iron nail sinks because it is small and dense, while an enormous steel ship floats because its hollow shape displaces a weight of water equal to its own weight.
- The Dead Sea is the saltiest water body on Earth (~300 grams of salt per litre). Its density is so high that a human body naturally floats on its surface without drowning.
- Solubility: Substances like salt and sugar dissolve completely in water; chalk, oil, and sand do not dissolve.
- Mahatma Gandhi led the historic Dandi March in 1930 from Ahmedabad to Dandi seashore to protest against the British tax on natural salt.
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
Why does a small iron nail sink in water, while a giant ship made of iron and steel floats easily on the sea?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
An iron nail is solid and dense; the weight of water it displaces is smaller than its own weight, causing it to sink. In contrast, an enormous iron ship is designed with a wide, hollow hull filled with air. The total volume of the ship displaces an amount of water whose buoyant force is greater than the total weight of the ship, allowing it to float safely.
CBSE Step-by-Step Marking Scheme
Solid nail displaces less water than its weight
1.5 Marks
Hollow ship hull displaces massive volume equal to ship weight
1.5 Marks
Q2
What is the Dead Sea? Why is it impossible for a swimmer to drown in the Dead Sea?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
The Dead Sea is a salt lake bordered by Jordan and Israel. It is the saltiest body of water on Earth, containing approximately 300 grams of dissolved salt per litre of water. Because of this extreme salt concentration, the density of the water is much higher than the density of the human body. As a result, an upward buoyant force naturally pushes a swimmer up, allowing a person to float effortlessly on the surface like a raft.
CBSE Step-by-Step Marking Scheme
Salinity level (300 grams of salt per litre)
1.5 Marks
Water density higher than human body providing automatic buoyancy
1.5 Marks
Q3
Why did Mahatma Gandhi organize the Dandi March in 1930? What was the outcome of this protest?
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
In 1930, the British colonial government passed the Salt Act, prohibiting Indians from manufacturing salt from seawater and placing a heavy tax on salt. Since salt is an essential daily food requirement for everyone, rich and poor alike, Mahatma Gandhi organized the Dandi March:
- Gandhi and his followers walked over 385 kilometres on foot from Sabarmati Ashram in Ahmedabad to the coastal village of Dandi.
- On 6 April 1930, Gandhi picked up a handful of natural salt from the seashore, boldly defying the British law.
- The march triggered the nationwide Civil Disobedience Movement, demonstrating that natural resources given by nature should never be taxed.
CBSE Step-by-Step Marking Scheme
Background of the unjust British Salt Act and tax
1.5 Marks
March from Sabarmati to Dandi (385 km)
1.5 Marks
Breaking of law and initiation of Civil Disobedience
1 Mark
Q4
State whether the following float or sink in water, and give the scientific reason for each: (a) An empty plastic bottle, (b) A plastic bottle tightly filled with sand, (c) An iron pin, (d) An aluminium foil balled tightly vs spread wide.
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
- (a) Empty plastic bottle: Floats, because it contains air and its average density is much lower than water.
- (b) Plastic bottle filled with sand: Sinks, because dense sand increases its total weight beyond the buoyant water displacement.
- (c) An iron pin: Sinks, because solid iron has higher density than water and displaces negligible water volume.
- (d) Aluminium foil:
- Spread wide into a flat cup: Floats, because its bowl shape displaces more water.
- Pressed into a tight, dense ball: Sinks, because high compactness decreases displacement volume.
CBSE Step-by-Step Marking Scheme
Correct floating/sinking prediction for (a) and (b)
2 Marks
Correct prediction and density/shape explanation for (c) and (d)
2 Marks
Q5
How can salt be extracted from seawater in coastal areas? Describe the process of salt pans.
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Salt is manufactured through solar evaporation in shallow coastal beds:
- Seawater is channelled into large, shallow rectangular plots called salt pans (Namak ke Khet) bordered by mud bunds.
- The water is left exposed to the blazing sun and strong sea winds.
- Water slowly evaporates into the atmosphere as water vapour, leaving behind solid mounds of crystalline white raw salt.
- The harvested salt crystals are collected, washed, iodised, and packaged.
CBSE Step-by-Step Marking Scheme
Channelling into shallow salt pans
1.5 Marks
Solar evaporation leaving solid salt crystals
1.5 Marks
Q6
[Textbook Activity & Question 1] In 'Experiments with Water', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Experiments with Water
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q7
[Textbook Activity & Question 2] In 'Experiments with Water', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Experiments with Water
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 3] In 'Experiments with Water', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Experiments with Water
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 4] In 'Experiments with Water', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Experiments with Water
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 5] In 'Experiments with Water', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Experiments with Water
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 6] In 'Experiments with Water', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Experiments with Water
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 7] In 'Experiments with Water', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Experiments with Water
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 8] In 'Experiments with Water', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Experiments with Water
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 9] In 'Experiments with Water', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Experiments with Water
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 10] In 'Experiments with Water', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Experiments with Water
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 11] In 'Experiments with Water', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Experiments with Water
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 12] In 'Experiments with Water', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Experiments with Water
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 13] In 'Experiments with Water', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Experiments with Water
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 14] In 'Experiments with Water', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Experiments with Water
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 15] In 'Experiments with Water', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Experiments with Water
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 16] In 'Experiments with Water', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Experiments with Water
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 17] In 'Experiments with Water', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Experiments with Water
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Experiments with Water, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
Factors Affecting the Rate of Dissolution
Case Scenario: While preparing lemonade for guests on a hot summer afternoon, Rohit added ice cubes before adding sugar and noticed the sugar took a very long time to dissolve.
Analytical Task: Explain three scientific methods by which sugar can be made to dissolve much faster in water.
Three Methods to Accelerate Dissolution:
1. Stirring: Stirring moves water molecules rapidly across sugar crystals, exposing fresh solvent molecules to solute surfaces.
2. Using Warm Water: Warm water molecules possess higher kinetic energy, separating sugar molecules much faster than cold water. (Add ice only AFTER sugar dissolves).
3. Using Powdered Sugar: Fine powder has a vastly greater surface area than large crystal cubes, speeding up dissolution.
CBSE Assessment Rubric: 1 Mark for Stirring + 2 Marks for Warm water kinetic energy + 2 Marks for Powdered surface area = 5 Marks
8
Malaria • Class 5 EVS (Classic CBSE)
Chapter 8: A Treat for Mosquitoes
Malaria, Anopheles Mosquito, Anaemia & Iron, Ronald Ross Discovery & Vector Control
Chapter Highlights, Environmental Insights & Scientific Ideas
- Malaria is caused by a tiny single-celled protozoan parasite (Plasmodium) transmitted through the bite of a female Anopheles mosquito.
- Malaria causes shivering, chills, high recurring fever, sweating, and severe headache; it is confirmed through a microscopic blood smear test.
- Anaemia is a condition where haemoglobin or iron levels in the blood fall below the normal range (12 to 16 g/dL in children), causing weakness, poor physical growth, and difficulty concentrating.
- Iron-rich foods: Amla (Indian gooseberry), Jaggery (gur), green leafy vegetables (spinach, methi), and beans.
- Ronald Ross discovered in Secunderabad that mosquitoes spread malaria, winning the Nobel Prize in Medicine in 1902.
- Mosquito control: Pour kerosene/oil on standing water to choke larvae, introduce Gambusia fish in ponds, and keep water coolers dry.
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
What causes malaria, which mosquito transmits it, and what symptoms appear in a patient suffering from malaria?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Malaria is caused by a microscopic protozoan parasite called Plasmodium, transmitted from one person to another through the bite of an infected female Anopheles mosquito (identifiable by its spotted wings and tilted posture while resting).
Symptoms: Shivering with chills, recurring high fever every alternative day, severe headache, muscle pains, nausea, and profuse sweating when fever drops.
Symptoms: Shivering with chills, recurring high fever every alternative day, severe headache, muscle pains, nausea, and profuse sweating when fever drops.
CBSE Step-by-Step Marking Scheme
Causative agent (Plasmodium parasite)
1 Mark
Vector identification (female Anopheles mosquito)
1 Mark
Key symptoms (chills, recurring fever, sweating)
1 Mark
Q2
What is anaemia? What is the normal haemoglobin level for growing school children, and what dietary changes cure anaemia?
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Anaemia is a blood condition that occurs when the amount of haemoglobin or red blood cells in the body drops below the healthy threshold.
- Normal Haemoglobin Range: 12 to 16 grams per decilitre (g/dL) for children.
- Effects: Weakness, dizziness, stunted physical growth, and reduced stamina and concentration during studies.
- Dietary Cure: Foods rich in iron and Vitamin C—such as Amla (Indian gooseberry), Jaggery (gur), green leafy vegetables (spinach, fenugreek), beetroot, and pulses, along with iron folic acid tablets distributed in schools.
CBSE Step-by-Step Marking Scheme
Definition of anaemia as haemoglobin deficiency
1 Mark
Normal range 12-16 g/dL & cognitive/physical impacts
1.5 Marks
Dietary sources (amla, jaggery, spinach, iron tablets)
1.5 Marks
Q3
Describe the historic discovery made by Ronald Ross regarding malaria in Secunderabad.
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
In the late 19th century, people believed malaria was caused by bad air from swampy marshes (mala-aria = bad air). British doctor Ronald Ross spent years in Secunderabad inspecting blood slides under microscopes. He let mosquitoes bite malaria patients, dissected the mosquitoes' stomachs, and discovered the exact same Plasmodium parasites inside the mosquito gut. This proved conclusively that mosquitoes transmit malaria, earning him the Nobel Prize in Medicine in 1902.
CBSE Step-by-Step Marking Scheme
Disproving the 'bad air' myth through dissection
1.5 Marks
Verification of parasites in mosquito stomach & 1902 Nobel Prize
1.5 Marks
Q4
Name three diseases transmitted by mosquitoes. How can we differentiate between a normal mosquito and an Anopheles mosquito?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Three mosquito-borne diseases:
- Malaria (transmitted by female Anopheles mosquito).
- Dengue (transmitted by Aedes mosquito).
- Chikungunya (transmitted by Aedes mosquito).
CBSE Step-by-Step Marking Scheme
Naming Malaria, Dengue, and Chikungunya with vectors
1.5 Marks
Physical posture difference (45-degree tilt and spotted wings)
1.5 Marks
Q5
Why do doctors advise hanging mosquito nets and applying wire mesh to windows rather than solely spraying chemical insect repellents?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Physical barriers like bed nets and window wire mesh are far safer and more effective:
- They create a continuous physical barrier that stops mosquitoes from entering without exposing family members to toxic chemical fumes.
- Chemical repellent coils and sprays emit harmful fumes containing pyrethroids, which irritate children's lungs and trigger asthma attacks.
- Mosquitoes develop genetic resistance to repeated chemical sprays over time, whereas physical screens never lose effectiveness.
CBSE Step-by-Step Marking Scheme
Physical barrier safety without toxic inhalants
1.5 Marks
Health hazards of chemical coils and insect resistance
1.5 Marks
Q6
[Textbook Activity & Question 1] In 'A Treat for Mosquitoes', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • A Treat for Mosquitoes
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q7
[Textbook Activity & Question 2] In 'A Treat for Mosquitoes', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • A Treat for Mosquitoes
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 3] In 'A Treat for Mosquitoes', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • A Treat for Mosquitoes
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 4] In 'A Treat for Mosquitoes', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • A Treat for Mosquitoes
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 5] In 'A Treat for Mosquitoes', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • A Treat for Mosquitoes
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 6] In 'A Treat for Mosquitoes', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • A Treat for Mosquitoes
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 7] In 'A Treat for Mosquitoes', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • A Treat for Mosquitoes
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 8] In 'A Treat for Mosquitoes', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • A Treat for Mosquitoes
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 9] In 'A Treat for Mosquitoes', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • A Treat for Mosquitoes
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 10] In 'A Treat for Mosquitoes', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • A Treat for Mosquitoes
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 11] In 'A Treat for Mosquitoes', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • A Treat for Mosquitoes
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 12] In 'A Treat for Mosquitoes', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • A Treat for Mosquitoes
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 13] In 'A Treat for Mosquitoes', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • A Treat for Mosquitoes
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 14] In 'A Treat for Mosquitoes', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • A Treat for Mosquitoes
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 15] In 'A Treat for Mosquitoes', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • A Treat for Mosquitoes
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 16] In 'A Treat for Mosquitoes', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • A Treat for Mosquitoes
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 17] In 'A Treat for Mosquitoes', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • A Treat for Mosquitoes
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Treat for Mosquitoes, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
Preventing Dengue, Malaria, and Chikungunya
Case Scenario: During the rainy season, stagnant water collected in old car tires, broken flowerpots, and cooler trays in a residential colony. Within two weeks, multiple residents fell sick with dengue and malaria.
Analytical Task: Explain four practical actions community residents must take to prevent mosquito breeding around their homes.
Four Essential Vector Control Actions:
1. Eliminate Stagnant Water: Empty, scrub, and dry out water coolers, flowerpot trays, buckets, and bird baths every week.
2. Cover Water Storage: Keep overhead and underground water storage tanks tightly sealed with lids.
3. Use Oil or Kerosene Film: If water cannot be drained from a pit or puddle, pour a few drops of kerosene or oil on top; this creates a thin film that stops mosquito larvae from breathing air.
4. Biological Control (Gambusia fish): Put small Gambusia fish into local decorative ponds and ditches; they voraciously consume mosquito larvae.
CBSE Assessment Rubric: 1 Mark each for 4 preventive actions + 1 Mark for biological control explanation = 5 Marks
9
Mountaineering at NIM Uttarkashi • Class 5 EVS (Classic CBSE)
Chapter 9: Up You Go!
Mountaineering at NIM Uttarkashi, Group Leader Duties, Bachendri Pal & Mountain Equipment
Chapter Highlights, Environmental Insights & Scientific Ideas
- Nehru Institute of Mountaineering (NIM) in Uttarkashi trains mountaineers in rock climbing and survival under leader Brigadier Gyan Singh.
- Responsibilities of a group leader: help others carry luggage, let the group go ahead and walk at the back, find good camping spots, and care for sick members.
- Mountaineering tools: pitons (metal spikes), carabiners (metal clips), ropes, ice axes, crampons, and rucksacks.
- Bachendri Pal became the first Indian woman (and 5th in the world) to climb Mount Everest (Sagarmatha) on 23 May 1984.
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
What are the key responsibilities of a group leader in a mountaineering expedition?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
A group leader has several critical responsibilities:
- Help group members carry their heavy rucksacks if they are struggling.
- Let the entire team go ahead and walk last to ensure nobody is left behind.
- Look for suitable places to rest and pitch tents.
- Take care of anyone who falls sick and keep team spirits high even when tired.
CBSE Step-by-Step Marking Scheme
Assisting team members and walking last
1.5 Marks
Camping site selection and caring for sick members
1.5 Marks
Q2
Who is Bachendri Pal? Describe her historic climb to Mount Everest on 23 May 1984.
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Bachendri Pal was born in Nakuri village, Garhwal (Uttarakhand). She trained at the Nehru Institute of Mountaineering and was selected for the 1984 Everest expedition:
- On the night of 15 May, an avalanche buried her camp in snow; she was rescued by teammates.
- On 23 May 1984 at 1:07 PM, Bachendri stepped onto the 8,848-metre-high summit of Mount Everest (known as Sagarmatha in Nepal).
- She spent 43 minutes on the summit, planted the Indian National Tricolour flag, and bowed in prayer, becoming the first Indian woman to conquer Everest.
CBSE Step-by-Step Marking Scheme
Background and avalanche survival
1.5 Marks
Summit timestamp (23 May 1984) and national flag hoisting
1.5 Marks
First Indian woman milestone achievement
1 Mark
Q3
Why is high-calorie food (like vitamin C tablets, iron tablets, hot chocolate milk) provided to mountaineers every morning?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
At high altitudes in snowy mountains:
- The body burns immense energy carrying heavy rucksacks against steep gravitational inclines and freezing temperatures.
- Vitamin C boosts immunity against mountain colds, iron tablets stimulate red blood cell and haemoglobin production for better oxygen transport, and hot chocolate milk provides rapid carbohydrates and keeps the core body warm.
CBSE Step-by-Step Marking Scheme
Immense energy expenditure in freezing conditions
1.5 Marks
Specific nutritional role of Vitamin C, Iron, and hot chocolate
1.5 Marks
Q4
What is a 'Tyrolean traverse' and what specialized gear (carabiners, pitons, slings) is required to cross an icy mountain river safely?
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
A Tyrolean traverse is a mountaineering method used to cross rapid, icy mountain torrents without stepping into the freezing water:
- A thick, high-tensile climbing rope is stretched tightly across the river bank and anchored securely to rock walls using forged steel spikes called pitons.
- The climber wears a sturdy safety harness sling around their waist.
- A metal spring-loaded clip ring called a carabiner hooks the climber's harness directly to the horizontal rope.
- The climber pulls themselves hand-over-hand along the suspended rope to cross over to the opposite bank safely.
CBSE Step-by-Step Marking Scheme
Definition of rope crossing over turbulent mountain river
1.5 Marks
Function of pitons (anchors), carabiner (locking clip), and harness
2.5 Marks
Q5
What is mountain sickness (altitude sickness)? Why do climbers carry oxygen cylinders to high mountain peaks?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
As climbers ascend above 3,000 metres:
- Atmospheric air pressure drops and the concentration of oxygen molecules decreases drastically (thin air).
- Climbers experience altitude sickness: breathlessness, nausea, intense dizziness, headache, and extreme fatigue.
- To survive in the 'Death Zone' (above 8,000 metres where oxygen is insufficient to sustain life), climbers carry portable pressurized oxygen cylinders fitted with breathing masks.
CBSE Step-by-Step Marking Scheme
Explanation of low air pressure and thin oxygen
1.5 Marks
Symptoms and necessity of supplementary oxygen tanks
1.5 Marks
Q6
[Textbook Activity & Question 1] In 'Up You Go!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Up You Go!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q7
[Textbook Activity & Question 2] In 'Up You Go!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Up You Go!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 3] In 'Up You Go!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Up You Go!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 4] In 'Up You Go!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Up You Go!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 5] In 'Up You Go!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Up You Go!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 6] In 'Up You Go!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Up You Go!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 7] In 'Up You Go!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Up You Go!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 8] In 'Up You Go!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Up You Go!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 9] In 'Up You Go!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Up You Go!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 10] In 'Up You Go!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Up You Go!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 11] In 'Up You Go!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Up You Go!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 12] In 'Up You Go!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Up You Go!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 13] In 'Up You Go!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Up You Go!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 14] In 'Up You Go!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Up You Go!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 15] In 'Up You Go!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Up You Go!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 16] In 'Up You Go!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Up You Go!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 17] In 'Up You Go!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Up You Go!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Up You Go!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
Brigadier Gyan Singh's Camp & Dealing with Blizzards
Case Scenario: During a harsh winter expedition in the Himalayas, a blizzard hit Camp 4 at 21,000 feet. Temperatures plummeted to -20°C, and two members developed severe hypothermia. As group leader, Sangeeta had to coordinate emergency shelters, warmth, and evacuation.
Analytical Task: What crucial leadership decisions should a mountaineering leader take during extreme weather emergencies to protect team lives?
A mountaineering leader must prioritize human safety over conquering the summit:
1. Maintain Calm and Morale: Avoid panic, gather all members, and keep everyone talking to prevent hypothermia drowsiness.
2. Secure Immediate Shelter: Anchor two-layer nylon tents firmly using pitons and rocks to resist howling blizzard winds.
3. Immediate First Aid for Hypothermia: Remove wet clothing, wrap victims in dry sleeping bags, share body warmth, and provide hot energy drinks (tea with glucose/chocolate).
4. Timely Retreat Call: A courageous leader knows when to abort an ascent and safely guide members back down to lower base camp before oxygen supplies run out.
CBSE Assessment Rubric: 2 Marks for emergency shelter and hypothermia response + 3 Marks for leadership qualities and timely retreat decision = 5 Marks
10
Golconda Fort • Class 5 EVS (Classic CBSE)
Chapter 10: Walls Tell Stories
Golconda Fort, Bastions, Water Engineering, Cannons & Museum Artefacts
Chapter Highlights, Environmental Insights & Scientific Ideas
- Golconda Fort in Hyderabad has huge thick stone walls, bastions (burj) for 360-degree surveillance, and double heavy iron gates with sharp spikes.
- Acoustics: Faint whispers at the main entrance (Fateh Darwaza) could be heard clearly up at the royal palace (Bala Hissar).
- Cannons used bronze and iron gunpowder balls; Mughal Emperor Aurangzeb besieged Golconda for 8 months in 1687.
- Water was lifted to high fortress gardens using clay pipes and bullock-powered Persian wheel mechanisms.
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
What were bastions (burj) in Golconda Fort and why were big holes made in them?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Bastions (burj) are circular towers built into the outer boundary walls of the fort, constructed much higher than the wall itself.
Purpose of holes: Soldiers peeped through small openings to scan for approaching enemy armies from all directions. The holes protected the soldiers while providing a wide vantage angle to aim guns and cannons safely.
Purpose of holes: Soldiers peeped through small openings to scan for approaching enemy armies from all directions. The holes protected the soldiers while providing a wide vantage angle to aim guns and cannons safely.
CBSE Step-by-Step Marking Scheme
Definition of bastions as elevated round towers
1.5 Marks
Strategic vantage for shooting weapons safely
1.5 Marks
Q2
Why did Aurangzeb's massive army fail to enter Golconda Fort for eight months in 1687?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Aurangzeb's army could not breach Golconda Fort because:
- The walls were exceptionally thick and built on steep granite bedrock.
- A deep, wide water-filled moat surrounded the fortress walls. If soldiers tried to cross, they were easily targeted from bastions.
- Heavy iron gates had sharp defensive spikes preventing war elephants from ramming them open.
CBSE Step-by-Step Marking Scheme
Thick walls and steep terrain
1 Mark
Deep surrounding moat
1 Mark
Spiked iron gates preventing elephant entry
1 Mark
Q3
How was water lifted to high palace gardens and fountains inside Golconda Fort hundreds of years before electricity was invented?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Engineers in Golconda Fort used ingenious gravity hydraulics and animal power:
- Pairs of bullocks walked in circles turning a large horizontal wooden geared wheel.
- This turned a vertical axle connected to a chain of earthen pots called a Persian wheel (Rahat / Arhat).
- The pots dipped into deep underground stepwells, filled with water, rose to the top, and emptied into elevated stone channels.
- Interconnected clay pipes embedded inside thick walls carried water upward to high palace reservoirs and fountains by hydraulic pressure.
CBSE Step-by-Step Marking Scheme
Bullock-powered gear mechanisms and Persian wheel (Rahat)
1.5 Marks
Underground clay pipes and hydraulic pressure delivery
1.5 Marks
Q4
Describe the unique acoustic (sound) engineering of Golconda Fort. How did it protect royalty from surprise attacks?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Golconda Fort features extraordinary acoustic engineering:
- If a person stands at the main outer entrance gate (Fateh Darwaza) and claps or speaks, the sound echoes through specific vaulted stone arches and can be heard with striking clarity up at the royal palace (Bala Hissar) situated on top of the hill.
- This served as an instant, foolproof warning alarm: guards at the gate could alert the Sultan of approaching enemy troops or suspicious visitors without using messengers.
CBSE Step-by-Step Marking Scheme
Transmission of claps/whispers from Fateh Darwaza to Bala Hissar
1.5 Marks
Early warning defense system for the royal court
1.5 Marks
Q5
Why is it our civic duty to preserve historical monuments? Why should visitors never scratch names or graffiti on heritage walls?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Historical monuments are irreplaceable treasures of human heritage:
- They provide living proof of our ancestors' art, science, engineering, and culture.
- Carving names, scratching paint, or throwing plastic wrappers causes permanent physical disfigurement to ancient limestone, frescoes, and stone engravings.
- Once defaced, historic craftsmanship can never be restored to its original glory. Preserving monuments ensures future generations learn from our cultural heritage with pride.
CBSE Step-by-Step Marking Scheme
Value of monuments as living historical and architectural evidence
1.5 Marks
Permanent damage caused by scratching graffiti and vandalism
1.5 Marks
Q6
[Textbook Activity & Question 1] In 'Walls Tell Stories', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Walls Tell Stories
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q7
[Textbook Activity & Question 2] In 'Walls Tell Stories', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Walls Tell Stories
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 3] In 'Walls Tell Stories', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Walls Tell Stories
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 4] In 'Walls Tell Stories', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Walls Tell Stories
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 5] In 'Walls Tell Stories', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Walls Tell Stories
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 6] In 'Walls Tell Stories', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Walls Tell Stories
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 7] In 'Walls Tell Stories', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Walls Tell Stories
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 8] In 'Walls Tell Stories', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Walls Tell Stories
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 9] In 'Walls Tell Stories', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Walls Tell Stories
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 10] In 'Walls Tell Stories', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Walls Tell Stories
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 11] In 'Walls Tell Stories', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Walls Tell Stories
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 12] In 'Walls Tell Stories', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Walls Tell Stories
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 13] In 'Walls Tell Stories', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Walls Tell Stories
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 14] In 'Walls Tell Stories', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Walls Tell Stories
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 15] In 'Walls Tell Stories', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Walls Tell Stories
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 16] In 'Walls Tell Stories', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Walls Tell Stories
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 17] In 'Walls Tell Stories', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Walls Tell Stories
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Walls Tell Stories, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
Acoustics & Defense Engineering of Golconda Fort
Case Scenario: While visiting Golconda Fort in Hyderabad, school students observed that a soft hand-clap at Fateh Darwaza could be heard clearly at the Bala Hissar pavilion located nearly 1 km away on the hilltop. However, some tourists were seen carving names on ancient stone walls with keys.
Analytical Task: Explain the engineering purpose behind Golconda's acoustic design and describe why defacing historical monuments with graffiti is a punishable offense.
Purpose of Acoustic Engineering:
The Qutb Shahi rulers engineered the dome acoustics as an early military warning system. A guard clapping or beating a drum at the entrance gate instantly alerted the king and military commanders at the summit pavilion about approaching enemy attacks or treason, without requiring electric wires.
Civic Duty to Protect Monuments:
Historical monuments represent centuries of national culture, artistic mastery, and scientific heritage. Carving graffiti permanently disfigures priceless heritage stones, encourages further vandalism, and violates the Ancient Monuments and Archaeological Sites and Remains Act, which prescribes heavy fines and imprisonment.
CBSE Assessment Rubric: 2.5 Marks for acoustic military warning explanation + 2.5 Marks for monument preservation ethics and legal penalties = 5 Marks
11
Space Travel • Class 5 EVS (Classic CBSE)
Chapter 11: Sunita in Space
Space Travel, Zero Gravity, Earth from Space, Neil Armstrong & Moon Phases
Chapter Highlights, Environmental Insights & Scientific Ideas
- Astronaut Sunita Williams spent over 6 months aboard the International Space Station (ISS).
- In space, there is microgravity (weightlessness): astronauts float everywhere, water forms floating bubbles, food floats, and hair stands upright.
- Seen from space, Earth looks like a glowing blue-and-white marble; national borders do not exist in nature, only land, oceans, and clouds.
- Neil Armstrong became the first human to walk on the Moon on 20 July 1969.
- Gravity is the invisible force with which the Earth pulls everything towards its center.
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
Describe what living in a zero-gravity spacecraft is like based on Sunita Williams' experiences.
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Living in zero gravity is very different from living on Earth:
- Floating constantly: Astronauts cannot stand or walk on the floor; they float from one cabin to another and must strap themselves to their beds to sleep.
- Floating Water & Food: Water does not flow; it forms floating blobs that astronauts catch with tissues to wipe their faces. Food packets float in the cabin.
- Hair Stands Up: Without gravity pulling it down, hair stays standing upright all the time, eliminating the need for combs.
CBSE Step-by-Step Marking Scheme
Continuous floating and bed straps
1.5 Marks
Floating water droplets and food packets
1.5 Marks
Upright hair phenomenon
1 Mark
Q2
Why did Sunita Williams say: 'Division of countries is only on paper, Earth has no lines drawn on it'?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
When looking down at Earth from space, one can only see continents, vast blue oceans, mountain ranges, and white swirl clouds. There are no lines, walls, or fences separating India, Pakistan, or America. Sunita pointed out that political borders are artificial divisions created in human minds and drawn on paper maps, whereas Earth is one interconnected home for all humanity.
CBSE Step-by-Step Marking Scheme
Natural features visible from orbit vs absence of physical borders
1.5 Marks
Philosophical concept of one united global planet
1.5 Marks
Q3
What is gravity? Give three daily life examples showing the effect of Earth's gravitational force on our planet.
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Gravity is the universal invisible force of attraction with which the Earth pulls all objects towards its center.
Three Examples:
Three Examples:
- When a ball is thrown up into the sky, it slows down, stops, and falls back down to Earth.
- Ripe apples and mangoes fall downward from tree branches onto the ground rather than flying into the clouds.
- Water in rivers always flows downhill towards lakes and oceans, and stays inside our glasses without floating away.
CBSE Step-by-Step Marking Scheme
Definition of Earth's gravitational attraction
1.5 Marks
3 clear everyday examples (falling ball, falling fruit, water flow)
1.5 Marks
Q4
Who was Neil Armstrong? On what date did he achieve the historic milestone of landing on the Moon?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Neil Armstrong was an American astronaut who commanded the Apollo 11 lunar space mission. On 20 July 1969, he stepped out of the lunar module 'Eagle' and became the first human being in history to walk on the surface of the Moon, famously declaring: "That's one small step for man, one giant leap for mankind."
CBSE Step-by-Step Marking Scheme
Identification of Neil Armstrong and Apollo 11 mission
1.5 Marks
Exact historical date (20 July 1969) and first moonwalk milestone
1.5 Marks
Q5
Why does the shape of the Moon appear to change every night in the sky? What is the difference between Purnima and Amavasya?
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
The Moon does not produce its own light; it reflects light from the Sun. As the Moon orbits the Earth, we see different portions of its illuminated sunlit side:
- Phases of the Moon: Crescent Moon -> Half Moon (First Quarter) -> Gibbous Moon -> Full Moon -> Waning phases.
- Purnima (Full Moon Day): The entire illuminated hemisphere of the Moon faces the Earth; the Moon appears as a complete, glowing circular disk.
- Amavasya (New Moon Day): The sunlit side of the Moon faces completely away from Earth; the Moon is entirely invisible in the night sky.
CBSE Step-by-Step Marking Scheme
Explanation of reflected sunlight during orbital motion
1.5 Marks
Definition of Purnima (full visible disk)
1.25 Marks
Definition of Amavasya (sunlit side facing away, dark sky)
1.25 Marks
Q6
[Textbook Activity & Question 1] In 'Sunita in Space', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Sunita in Space
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q7
[Textbook Activity & Question 2] In 'Sunita in Space', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Sunita in Space
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 3] In 'Sunita in Space', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Sunita in Space
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 4] In 'Sunita in Space', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Sunita in Space
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 5] In 'Sunita in Space', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Sunita in Space
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 6] In 'Sunita in Space', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Sunita in Space
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 7] In 'Sunita in Space', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Sunita in Space
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 8] In 'Sunita in Space', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Sunita in Space
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 9] In 'Sunita in Space', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Sunita in Space
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 10] In 'Sunita in Space', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Sunita in Space
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 11] In 'Sunita in Space', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Sunita in Space
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 12] In 'Sunita in Space', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Sunita in Space
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 13] In 'Sunita in Space', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Sunita in Space
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 14] In 'Sunita in Space', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Sunita in Space
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 15] In 'Sunita in Space', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Sunita in Space
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 16] In 'Sunita in Space', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Sunita in Space
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 17] In 'Sunita in Space', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Sunita in Space
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Sunita in Space, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
Life Aboard the International Space Station (ISS)
Case Scenario: Astronaut Sunita Williams spent more than 195 days in space aboard the International Space Station orbiting Earth at 28,000 km/h. She described that in space, water does not flow into a glass; it floats as wobbling blobs that astronauts catch with tissues.
Analytical Task: Explain why water floats in blobs in space and describe two physical exercises astronauts must perform daily to prevent muscle and bone loss in zero gravity.
Why water floats in spherical blobs:
In orbit, the space station is in perpetual free-fall around Earth, producing a state of weightlessness (microgravity). Without gravity pulling liquid downward, water molecules are held together exclusively by their internal surface tension, naturally pulling the liquid into the shape with the minimum surface area—a sphere.
Essential Daily Exercises in Space:
1. Stationary Treadmill with Harness: Astronauts strap themselves with bungee cords to a treadmill and run 1-2 hours daily to provide impact force to leg bones.
2. Resistance Exercise Device (ARED): Mimics weightlifting using vacuum cylinders to maintain bone density and prevent severe muscle atrophy in microgravity.
CBSE Assessment Rubric: 2.5 Marks for surface tension and weightlessness explanation + 2.5 Marks for treadmill and resistance exercise methods = 5 Marks
12
Fossil Fuels • Class 5 EVS (Classic CBSE)
Chapter 12: What if it Finishes...?
Fossil Fuels, Petroleum Refining, Vehicle Pollution & Renewable Energy
Chapter Highlights, Environmental Insights & Scientific Ideas
- Petroleum (crude oil) is a smelly, thick, dark liquid formed over millions of years from dead marine organisms buried under intense heat and pressure.
- Crude oil is refined into petrol, diesel, kerosene, LPG (cooking gas), CNG, bitumen (asphalt for roads), and wax.
- Fossil fuels are non-renewable; once depleted, they cannot be created quickly.
- Vehicular smoke releases dangerous pollutants like carbon monoxide and soot particles, causing asthma and lung diseases.
- Alternative renewable energy: solar energy, wind power, and battery-electric vehicles.
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
How was petroleum formed beneath the Earth? Why is it classified as a non-renewable natural resource?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Petroleum was formed millions of years ago when tiny dead sea creatures and plants settled on the ocean floor and were buried under layers of sand and clay. Due to high pressure, extreme temperature, and absence of air over millions of years, the organic matter slowly transformed into crude oil.
It is non-renewable because human consumption is depleting existing reserves in decades, while nature requires millions of years to generate more.
It is non-renewable because human consumption is depleting existing reserves in decades, while nature requires millions of years to generate more.
CBSE Step-by-Step Marking Scheme
Biological formation over millions of years under heat/pressure
1.5 Marks
Non-renewable nature due to rapid depletion vs slow geological formation
1.5 Marks
Q2
List four simple habits we can adopt to save petrol and diesel in everyday life.
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Four fuel-saving habits:
- Switch off the vehicle engine at traffic red lights and railway crossings.
- Use public transport (metro, buses, shared vans) instead of driving private cars.
- Walk or ride a bicycle for short-distance local errands.
- Carpool with friends or colleagues and maintain correct tire pressure in vehicles.
CBSE Step-by-Step Marking Scheme
Engine switch-off at signals & public transit use
1.5 Marks
Bicycles/walking & carpooling practices
1.5 Marks
Q3
What products are obtained when crude petroleum is refined in an oil refinery? List six products and their uses.
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Crude petroleum is refined into multiple essential commercial fuels and materials:
- Petrol: Fuel for motorcycles, scooters, and cars.
- Diesel: Fuel for heavy transport (trucks, buses, tractors, trains, generators).
- LPG (Liquefied Petroleum Gas): Clean cooking gas for home kitchens.
- CNG (Compressed Natural Gas): Eco-friendly fuel for city buses and auto-rickshaws.
- Kerosene: Fuel for lamps, pressure stoves, and aviation turbojet fuel.
- Bitumen / Coal Tar & Paraffin Wax: Surfacing roads, making candles, vaseline, and ointments.
CBSE Step-by-Step Marking Scheme
Naming 6 petroleum byproducts accurately
2 Marks
Stating practical applications for each product
2 Marks
Q4
What environmental and health problems are caused by smoke and exhaust gases emitted by millions of vehicles in cities?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Vehicle exhaust contains toxic pollutants:
- Harmful Gases: Carbon monoxide, nitrogen oxides, sulphur dioxide, and fine particulate matter (PM2.5).
- Health Impacts: Inhaling vehicle exhaust causes burning eyes, coughing, bronchitis, asthma attacks, lung infections, and heart stress.
- Environmental Damage: Exhaust emissions form toxic smog in winter, acid rain, and contribute heavily to global warming and climate change.
CBSE Step-by-Step Marking Scheme
Listing pollutants (carbon monoxide, PM2.5, nitrogen oxides)
1.5 Marks
Health consequences (asthma, lung disease) and urban smog
1.5 Marks
Q5
Why are solar energy and electric vehicles considered the future of clean transportation? Mention two advantages.
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Solar energy and electric vehicles (EVs) are clean, sustainable alternatives to fossil fuels:
- Zero Tailpipe Emissions: Electric vehicles do not burn petrol or diesel and emit zero exhaust smoke, drastically improving city air quality.
- Renewable & Inexhaustible: Sunlight is free, limitless, and available in abundance in India; unlike petroleum reserves, solar energy will never run out.
CBSE Step-by-Step Marking Scheme
Zero emission air quality benefit
1.5 Marks
Infinite renewable nature of solar power
1.5 Marks
Q6
[Textbook Activity & Question 1] In 'What if it Finishes...?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • What if it Finishes...?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q7
[Textbook Activity & Question 2] In 'What if it Finishes...?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • What if it Finishes...?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 3] In 'What if it Finishes...?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • What if it Finishes...?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 4] In 'What if it Finishes...?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • What if it Finishes...?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 5] In 'What if it Finishes...?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • What if it Finishes...?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 6] In 'What if it Finishes...?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • What if it Finishes...?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 7] In 'What if it Finishes...?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • What if it Finishes...?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 8] In 'What if it Finishes...?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • What if it Finishes...?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 9] In 'What if it Finishes...?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • What if it Finishes...?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 10] In 'What if it Finishes...?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • What if it Finishes...?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 11] In 'What if it Finishes...?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • What if it Finishes...?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 12] In 'What if it Finishes...?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • What if it Finishes...?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 13] In 'What if it Finishes...?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • What if it Finishes...?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 14] In 'What if it Finishes...?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • What if it Finishes...?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 15] In 'What if it Finishes...?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • What if it Finishes...?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 16] In 'What if it Finishes...?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • What if it Finishes...?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 17] In 'What if it Finishes...?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • What if it Finishes...?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In What if it Finishes...?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
Petroleum Depletion & Sustainable Urban Mobility
Case Scenario: A traffic jam at an intersection in New Delhi caused thick black smoke, blaring horns, and stinging eyes among school children waiting in a bus. A digital board nearby showed that petroleum reserves will last for barely 40-50 more years at current consumption rates.
Analytical Task: Explain why petroleum is called a non-renewable fossil fuel and propose three sustainable alternatives for urban public transportation.
Why Petroleum is Non-Renewable:
Petroleum was formed millions of years ago from the decomposed remains of prehistoric marine plants and animals buried under extreme heat and pressure beneath tectonic layers. Once extracted, nature cannot replenish these reserves in a human timeframe.
Three Sustainable Urban Transportation Solutions:
1. Electric Mass Transit: Metro rail networks and electric buses (e-buses) powered by solar or wind grid electricity produce zero street-level exhaust.
2. Compressed Natural Gas (CNG) & Green Hydrogen: Burns far cleaner than petrol and diesel, releasing minimal particulate soot.
3. Pedestrian & Bicycle Green Corridors: Developing safe cycling tracks and carpooling incentives to drastically reduce private automobile use.
CBSE Assessment Rubric: 2 Marks for fossil fuel genesis explanation + 3 Marks for three distinct sustainable transit alternatives = 5 Marks
13
Gaurav Jani's Journey • Class 5 EVS (Classic CBSE)
Chapter 13: A Shelter so High!
Gaurav Jani's Journey, Leh Cold Desert, Changpas, Pashmina Shawls & Houseboats
Chapter Highlights, Environmental Insights & Scientific Ideas
- Gaurav Jani travelled on his motorcycle 'Loner' from Mumbai through Delhi and Kashmir up to Ladakh.
- Ladakh is known as a 'Cold Desert': it sits at high altitude, receives very little rainfall, and has snow-covered peaks and barren slopes.
- Houses in Leh: two-storey structures with thick stone walls coated with mud and lime; ground floor has no windows and houses animals and firewood in winter; flat wooden roofs dry vegetables.
- Changpa tribe lives at 5,000 metres on the Changthang plateau with special Changthangi goats that yield ultra-fine Pashmina wool.
- Pashmina shawl: hair is 6 times thinner than human hair; hand-weaving one shawl takes 250 hours and is warm as 6 woollen sweaters.
- Rebo: cone-shaped yak-hair tents of the Changpas; Donga and Shikara: wooden houseboats in Dal Lake, Srinagar.
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
Why is Ladakh called a 'Cold Desert'? Describe the distinctive architectural features of traditional homes in Leh.
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Ladakh is called a Cold Desert because it is situated at a high altitude of over 3,000 metres where rainfall is scarce (rain shadow of the Himalayas), winter temperatures plummet far below freezing, and the landscape consists of barren windswept mountains with minimal vegetation.
Features of Leh Houses:
Features of Leh Houses:
- Built with thick stone walls plastered with mud and lime to insulate against severe cold.
- Two storeys: the ground floor has no windows and is used to house livestock and store dry rations during freezing winters. The family lives on the first floor.
- Flat roofs made of sturdy tree trunks are used to sun-dry red chillies, apricots, and corn for winter food reserves.
CBSE Step-by-Step Marking Scheme
Explanation of cold desert geography and high altitude
1.5 Marks
Stone walls and ground floor without windows for livestock
1.5 Marks
Flat roofs utilized for drying winter rations
1 Mark
Q2
Who are the Changpas? Why are their Changthangi goats so special, and how are Pashmina shawls made?
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
The Changpas are a nomadic tribe living on the high, frigid Changthang plateau at 5,000 metres in Ladakh.
- Changthangi Goats: The colder and higher the altitude, the softer and warmer the fur these goats grow. In sub-zero temperatures (-40°C), they develop an undercoat of ultra-fine hair, so fine that six goat hairs equal the thickness of a single human hair.
- Pashmina Weaving: Because the hair is too fine for machines, skilled artisans in Kashmir weave it by hand on traditional looms. Weaving a single plain Pashmina shawl requires 250 hours of labour, producing a garment as warm as six woollen sweaters yet light enough to pass through a finger ring.
CBSE Step-by-Step Marking Scheme
Identification of Changpa nomadic tribe and high-altitude habitat
1 Mark
Ultra-fine goat fur characteristics (6x thinner than human hair)
1.5 Marks
Hand-weaving in Kashmir taking 250 hours per shawl
1.5 Marks
Q3
What is a 'Rebo'? How do the Changpas construct it using yak hair, and how does it protect them in -40°C temperatures?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
A Rebo is the large, conical tent used as a portable shelter by the nomadic Changpa tribe:
- Changpa women weave long strips from coarse, strong yak hair. Nine strips are stitched together and pitched over wooden poles dug into the ground.
- Yak hair is strong, windproof, and traps air pockets, providing exceptional thermal insulation that keeps the interior warm even when outside icy winds howl at 70 km/h in freezing -40°C winter temperatures.
CBSE Step-by-Step Marking Scheme
Definition of Rebo as woven yak hair cone tent
1.5 Marks
Windproof thermal insulation in -40°C weather
1.5 Marks
Q4
Describe the floating houseboats of Kashmir: Shikara, Donga, and the exquisite Khatamband ceiling woodwork.
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
In the Dal Lake and Jhelum river of Srinagar, Kashmir:
- Shikara: Sleek, lightweight wooden gondola boats used by tourists for boat rides and by locals for selling flowers, saffron, and vegetables.
- Donga & Houseboats: Massive floating wooden houses up to 80 feet long and 8 feet wide, complete with bedrooms, dining salons, and running water.
- Khatamband: Geometric interlocking ceiling wood carvings made from deodar timber fitted together like a jigsaw puzzle without using nails.
CBSE Step-by-Step Marking Scheme
Description of Shikara passenger/market boats
1 Mark
Architecture of 80-foot long floating houseboats/Donga
1.5 Marks
Khatamband jigsaw woodwork without nails
1.5 Marks
Q5
Compare the houses built in the hot desert of Rajasthan with the houses built in the cold desert of Ladakh.
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
- Hot Desert (Rajasthan):
- Walls are very thick, made of mud and plastered with cow dung and clay to prevent scorching solar heat from penetrating indoors.
- Roofs are thatched with thorny bushes (kheep) to allow hot air to escape.
- Cold Desert (Ladakh):
- Walls are made of heavy stone slabs coated with mud and lime to trap body warmth and block freezing sub-zero winds.
- Roofs are flat, constructed from thick deodar and poplar tree trunks, used for sun-drying winter food rations.
CBSE Step-by-Step Marking Scheme
Rajasthan mud walls and thatched brushwood roofs
2 Marks
Ladakh thick stone walls and flat wooden storage roofs
2 Marks
Q6
[Textbook Activity & Question 1] In 'A Shelter so High!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • A Shelter so High!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q7
[Textbook Activity & Question 2] In 'A Shelter so High!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • A Shelter so High!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 3] In 'A Shelter so High!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • A Shelter so High!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 4] In 'A Shelter so High!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • A Shelter so High!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 5] In 'A Shelter so High!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • A Shelter so High!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 6] In 'A Shelter so High!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • A Shelter so High!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 7] In 'A Shelter so High!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • A Shelter so High!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 8] In 'A Shelter so High!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • A Shelter so High!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 9] In 'A Shelter so High!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • A Shelter so High!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 10] In 'A Shelter so High!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • A Shelter so High!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 11] In 'A Shelter so High!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • A Shelter so High!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 12] In 'A Shelter so High!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • A Shelter so High!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 13] In 'A Shelter so High!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • A Shelter so High!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 14] In 'A Shelter so High!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • A Shelter so High!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 15] In 'A Shelter so High!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • A Shelter so High!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 16] In 'A Shelter so High!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • A Shelter so High!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 17] In 'A Shelter so High!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • A Shelter so High!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Shelter so High!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
Changpa Nomads & Pashmina Goat Rearing at 5,000 Metres
Case Scenario: Gaurav Jani rode his motorcycle 'Loner' to the high cold desert of Changthang in Ladakh at 5,000 metres. He met the Changpa tribe, who live in yak-hair tents called 'Rebo' alongside their special Changthangi goats that produce world-renowned fine Pashmina wool.
Analytical Task: Why do Pashmina goats produce softer and warmer wool only when grazing at extreme freezing altitudes, and how is authentic Pashmina spun and woven?
Biological Adaptation to Extreme Cold:
At freezing winter temperatures dipping to -40°C on Ladakh plateaus, Changthangi goats naturally grow an ultra-fine, warm undercoat beneath their coarse outer hair to insulate their bodies from hypothermia. This underfur is six times finer than human hair (approx. 12-15 microns) and cannot be grown in warmer lowlands.
Processing and Weaving:
In summer, the fine underfur is gently combed out from the goats. Because the strands are too delicate for mechanical factory machines, master Kashmiri weavers hand-spin the thread on charkhas and hand-weave it on traditional wooden looms in Srinagar. It takes roughly 250 hours of hand-weaving to produce one plain Pashmina shawl.
CBSE Assessment Rubric: 2.5 Marks for biological altitude adaptation + 2.5 Marks for hand-combing and 250-hour loom weaving process = 5 Marks
14
2001 Gujarat Earthquake • Class 5 EVS (Classic CBSE)
Chapter 14: When the Earth Shook!
2001 Gujarat Earthquake, Bhuj Disaster, Earthquake Safety Drills & Resilient Architecture
Chapter Highlights, Environmental Insights & Scientific Ideas
- On 26 January 2001, a massive earthquake struck Kutch and Bhuj in Gujarat, causing widespread collapse of buildings and loss of life.
- Earthquakes are caused by sudden slipping and movement of tectonic plates deep inside the Earth's crust.
- Emergency safety rule: Drop, Cover, and Hold on under a sturdy table, and move to open spaces away from tall structures and power lines.
- Earthquake-resilient local homes are built using lightweight timber frames, clay, cow dung, and woven bamboo that sway without collapsing.
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
What should a person do immediately if an earthquake strikes while they are indoors or outdoors?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
If Indoors:
- Do NOT run into stairwells or use elevators.
- Perform Drop, Cover, and Hold on: get under a heavy wooden table or bed and hold its legs firmly until shaking stops.
- Stay away from glass windows, mirrors, hanging chandeliers, and tall bookcases.
CBSE Step-by-Step Marking Scheme
Indoor actions (Drop, Cover, Hold under sturdy table)
1.5 Marks
Outdoor actions (Move to open field away from poles/buildings)
1.5 Marks
Q2
How did villagers in Kutch rebuild their homes after the 2001 earthquake to ensure they would withstand future tremors?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Villagers worked together using local materials and traditional knowledge:
- They mixed clay with cow dung to make thick insulating bricks and plastered walls with lime.
- They erected flexible lightweight wooden frames and bamboo pillars that absorb ground vibrations by swaying rather than cracking.
- They decorated the mud walls with traditional mirror work (Lippan art), creating safe, resilient, and climate-friendly round homes (Bhungas).
CBSE Step-by-Step Marking Scheme
Use of clay, cow dung, and lightweight wooden/bamboo frames
1.5 Marks
Circular Bhunga design absorbing seismic waves safely
1.5 Marks
Q3
What is an earthquake? Describe the devastation caused by the 26 January 2001 Gujarat earthquake in Bhuj and Kutch.
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
An earthquake is a sudden shaking or trembling of the Earth's crust caused by tectonic movements and release of energy along geological fault lines.
Devastation in Gujarat (26 January 2001):
Devastation in Gujarat (26 January 2001):
- A massive 7.7 magnitude quake struck while citizens were celebrating Republic Day.
- Thousands of buildings, schools, and hospitals in Bhuj, Ahmedabad, and Kutch collapsed into rubble in seconds.
- Over 20,000 people lost their lives, hundreds of thousands were injured, and millions became homeless in freezing winter.
CBSE Step-by-Step Marking Scheme
Scientific definition of earthquake from tectonic movements
1.5 Marks
Specific impacts on 26 Jan 2001 (Bhuj collapse, casualties, Republic Day)
2.5 Marks
Q4
What role do rescue and disaster relief teams (NDRF, Army, NGOs, and medical workers) play after an earthquake strikes?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Immediately following a seismic catastrophe:
- Search & Rescue: Specialist teams use sniffer dogs, acoustic listening devices, and hydraulic cutters to rescue trapped survivors from collapsed concrete debris.
- Medical Care: Field trauma hospitals and doctors provide emergency surgery, blood transfusions, and fracture stabilization.
- Relief Logistics: NGOs, the army, and government distribute emergency tents, blankets, drinking water packets, and hot meals to prevent epidemics.
CBSE Step-by-Step Marking Scheme
Search & rescue with sniffer dogs and hydraulic tools
1.5 Marks
Medical aid and food/shelter distribution
1.5 Marks
Q5
Why do engineers recommend building circular or low-rise mud and bamboo houses (Bhungas) in earthquake-prone zones?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Traditional circular huts (Bhungas) in Kutch have proven to be exceptionally earthquake-resistant:
- The circular geometry distributes ground seismic shock waves evenly along the curved perimeter, preventing localized stress concentrations that cause square corners to crack.
- Lightweight bamboo, wooden poles, and straw-clay mud walls do not shatter into heavy deadly concrete slabs if they fall, reducing injury risks to zero.
CBSE Step-by-Step Marking Scheme
Circular geometry distributing seismic energy evenly
1.5 Marks
Lightweight flexible materials preventing crushing injuries
1.5 Marks
Q6
[Textbook Activity & Question 1] In 'When the Earth Shook!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • When the Earth Shook!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q7
[Textbook Activity & Question 2] In 'When the Earth Shook!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • When the Earth Shook!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 3] In 'When the Earth Shook!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • When the Earth Shook!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 4] In 'When the Earth Shook!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • When the Earth Shook!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 5] In 'When the Earth Shook!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • When the Earth Shook!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 6] In 'When the Earth Shook!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • When the Earth Shook!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 7] In 'When the Earth Shook!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • When the Earth Shook!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 8] In 'When the Earth Shook!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • When the Earth Shook!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 9] In 'When the Earth Shook!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • When the Earth Shook!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 10] In 'When the Earth Shook!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • When the Earth Shook!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 11] In 'When the Earth Shook!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • When the Earth Shook!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 12] In 'When the Earth Shook!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • When the Earth Shook!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 13] In 'When the Earth Shook!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • When the Earth Shook!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 14] In 'When the Earth Shook!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • When the Earth Shook!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 15] In 'When the Earth Shook!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • When the Earth Shook!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 16] In 'When the Earth Shook!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • When the Earth Shook!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 17] In 'When the Earth Shook!', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • When the Earth Shook!
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In When the Earth Shook!, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
The 26 January 2001 Gujarat Earthquake & Seismic Safety
Case Scenario: On Republic Day 2001, a catastrophic earthquake measuring 7.7 on the Richter scale struck Bhuj and Kutch in Gujarat, flattening thousands of brick buildings within minutes. In contrast, many traditional circular mud houses with conical thatch roofs ('Bhunga') survived with minimal damage.
Analytical Task: Explain why traditional circular Bhunga houses resisted earthquake shocks better than unreinforced brick buildings, and list three emergency actions to take during an earthquake.
Why Circular Bhungas Resisted Earthquake Shocks:
The circular shape of traditional Kutch Bhungas has no right-angled corners where stress concentrates. Seismic shockwaves distribute evenly across the continuous curved mud-and-bamboo perimeter, allowing the structure to flex without wall collapse. In contrast, rigid rectangular brick walls with heavy cement roofs shattered under lateral ground shaking.
Three Essential Earthquake Emergency Actions:
1. Drop, Cover, and Hold On: If indoors, drop beneath a sturdy wooden table or desk and hold onto its legs until shaking completely stops.
2. Stay Clear of Heavy Overhead Objects: Move away from glass windows, chandeliers, bookcases, and brick parapets.
3. Move to Clear Open Ground: If outdoors, move swiftly into an open playground or field away from tall buildings, electric power lines, and billboards.
CBSE Assessment Rubric: 2.5 Marks for circular structural engineering analysis + 2.5 Marks for three scientific safety steps = 5 Marks
15
Dr. Zakir Hussain's Story • Class 5 EVS (Classic CBSE)
Chapter 15: Blow Hot, Blow Cold
Dr. Zakir Hussain's Story, Thermodynamics of Human Breath, Stethoscope & Wind Instruments
Chapter Highlights, Environmental Insights & Scientific Ideas
- Former President Dr. Zakir Hussain authored the famous story of the woodcutter and Mian Balishtiya.
- Human breath warms cold hands in winter because body breath temperature (~37°C) is higher than winter air.
- Human breath cools hot potatoes, soup, or tea because blowing air speeds up convection and surface evaporation.
- Breathing rate and heart rate increase during running and sports because muscles demand more oxygen.
- Wind instruments (Flute, Shehnai, Been, Whistle) produce musical notes by vibrating air columns.
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
Why did the woodcutter blow on his frozen hands, and why did he also blow on his hot boiled potatoes? How can the same breath blow hot and blow cold?
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
The woodcutter's breath appeared magical to Mian Balishtiya, but it is pure science:
- Blowing Hot (Warming hands): In freezing winter, hands are cold (around 10°C-15°C). The air coming from human lungs is body temperature (about 37°C). Because breath is warmer than the hands, heat transfers to the skin, making hands warm.
- Blowing Cold (Cooling food): Boiled potatoes or tea are steaming hot (around 80°C-90°C). Air blown from the mouth (37°C) is much cooler than the food. Blowing sweeps away hot air and accelerates evaporation, carrying away heat and rapidly cooling the food.
CBSE Step-by-Step Marking Scheme
Explanation of warming cold hands via 37°C lung air
2 Marks
Explanation of cooling hot food via evaporation and convection
2 Marks
Q2
What happens to your heartbeat and breathing rate when you skip, run, or exercise vigorously? What instrument does a doctor use to hear your heartbeat?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
When you exercise, sprint, or skip rope, your muscle cells work harder and consume oxygen at a much faster rate. To supply this required oxygen, your lungs breathe faster, and your heart pumps blood more rapidly, causing both heart rate and breathing rate to increase sharply.
A doctor uses a stethoscope (equipped with a sensitive diaphragm and earpieces) to listen clearly to heartbeats and chest sounds.
A doctor uses a stethoscope (equipped with a sensitive diaphragm and earpieces) to listen clearly to heartbeats and chest sounds.
CBSE Step-by-Step Marking Scheme
Increase in heart rate and breathing rate due to muscle oxygen demand
2 Marks
Identification of the stethoscope
1 Mark
Q3
Why do spectacles or mirror surfaces turn foggy and misty when we breathe on them on a cold morning?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
The air exhaled from human lungs contains a high percentage of warm water vapour (moisture). On a cold morning, glass lenses or mirror surfaces are very cold. When the warm, humid breath hits the cold glass, the water vapour suddenly cools and condenses into millions of microscopic liquid water droplets, forming a foggy, misty layer on the surface.
CBSE Step-by-Step Marking Scheme
Presence of warm water vapour in exhaled breath
1.5 Marks
Condensation into tiny droplets upon touching cold glass
1.5 Marks
Q4
Name four traditional musical instruments where melodious tunes are created by blowing air columns. How does a flute produce sound?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Four Wind Instruments:
- Flute (बांसुरी)
- Shehnai (शहनाई)
- Been (बीन)
- Harmonium (हार्मोनियम)
CBSE Step-by-Step Marking Scheme
Listing 4 wind instruments correctly
1.5 Marks
Explanation of vibrating air column and finger hole modulation
1.5 Marks
Q5
How can you make a simple paper whistle or paper blower at home? Describe the steps.
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
To make a simple paper whistle:
- Cut a strip of paper about 10 cm long and 4 cm wide.
- Fold the strip in half lengthwise.
- In the middle of the fold, cut a tiny triangular or semi-circular notch.
- Fold back the two outer flaps, hold the whistle between your fingers with the hole facing outward, and blow air firmly into the slit. The rapid vibration of the paper edges creates a sharp, loud whistling sound.
CBSE Step-by-Step Marking Scheme
Folding and cutting the paper strip with a notch
1.5 Marks
Mechanism of air blowing creating edge vibration
1.5 Marks
Q6
[Textbook Activity & Question 1] In 'Blow Hot, Blow Cold', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Blow Hot, Blow Cold
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q7
[Textbook Activity & Question 2] In 'Blow Hot, Blow Cold', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Blow Hot, Blow Cold
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 3] In 'Blow Hot, Blow Cold', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Blow Hot, Blow Cold
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 4] In 'Blow Hot, Blow Cold', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Blow Hot, Blow Cold
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 5] In 'Blow Hot, Blow Cold', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Blow Hot, Blow Cold
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 6] In 'Blow Hot, Blow Cold', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Blow Hot, Blow Cold
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 7] In 'Blow Hot, Blow Cold', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Blow Hot, Blow Cold
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 8] In 'Blow Hot, Blow Cold', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Blow Hot, Blow Cold
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 9] In 'Blow Hot, Blow Cold', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Blow Hot, Blow Cold
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 10] In 'Blow Hot, Blow Cold', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Blow Hot, Blow Cold
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 11] In 'Blow Hot, Blow Cold', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Blow Hot, Blow Cold
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 12] In 'Blow Hot, Blow Cold', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Blow Hot, Blow Cold
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 13] In 'Blow Hot, Blow Cold', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Blow Hot, Blow Cold
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 14] In 'Blow Hot, Blow Cold', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Blow Hot, Blow Cold
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 15] In 'Blow Hot, Blow Cold', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Blow Hot, Blow Cold
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 16] In 'Blow Hot, Blow Cold', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Blow Hot, Blow Cold
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 17] In 'Blow Hot, Blow Cold', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Blow Hot, Blow Cold
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Blow Hot, Blow Cold, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
Dr. Zakir Husain's Fable of the Woodcutter & Miya Balishtiya
Case Scenario: In the famous fable written by former President of India Dr. Zakir Husain, a tiny man named Miya Balishtiya was perplexed watching a woodcutter blow on his frozen fingers to warm them, and later blow on a boiling hot potato to cool it down.
Analytical Task: Explain the scientific reason why exhaled breath warms cold hands in winter yet cools down hot food or tea.
The direction of heat transfer depends on the temperature difference between our breath and the target object:
- Warming Cold Hands: The normal internal human body temperature is approximately 37°C. On freezing winter mornings when ambient air and finger skin drop to 10°C-15°C, exhaled breath is significantly warmer than our fingers. Heat transfers from the warm breath to cold skin through conduction and convection, providing warmth.
- Cooling Boiling Potatoes: A boiling hot potato or fresh cup of tea has a temperature of 80°C to 100°C, which is much hotter than our 37°C breath. When we blow air over the potato, our cooler breath rapidly replaces the layer of hot steam above it, accelerating heat dissipation and evaporative cooling, bringing the food down to edible temperature.
CBSE Assessment Rubric: 2.5 Marks for thermodynamic explanation of warming cold hands + 2.5 Marks for cooling hot food via convective steam replacement = 5 Marks
16
Sanitation Workers • Class 5 EVS (Classic CBSE)
Chapter 16: Who will do this Work?
Sanitation Workers, Dignity of Labour, Mahatma Gandhi's Ashram Rules & Dr. Ambedkar
Chapter Highlights, Environmental Insights & Scientific Ideas
- Sanitation workers perform essential public hygiene duties (cleaning gutters, garbage collection, sweeping streets) under hazardous conditions.
- Untouchability and caste discrimination forced specific communities into cleaning jobs for generations.
- Mahatma Gandhi's Sabarmati Ashram strictly enforced that every resident—guest or leader—must clean their own toilet.
- Dr. B.R. Ambedkar fought for the eradication of caste discrimination, establishing constitutional equality (Article 17 abolition of untouchability).
- Modern technology: robotic sewer cleaners, suction machines, and protective safety suits must replace manual scavenging.
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
Why did Mahatma Gandhi insist that every person living in his ashram must clean their own toilet?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Mahatma Gandhi wanted to break the deeply rooted caste prejudice and untouchability in Indian society. In those days, cleaning toilets was viewed as low, dirty work reserved only for so-called lower castes. By making every resident, lawyer, and guest clean their own toilet, Gandhi promoted the dignity of all labour and taught that no honest work is beneath any human being.
CBSE Step-by-Step Marking Scheme
Eradication of caste stigma and untouchability
1.5 Marks
Promotion of universal dignity of labour
1.5 Marks
Q2
What hardships do sanitation workers face daily, and how can modern technology eliminate manual cleaning of sewers?
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Hardships Faced:
Sanitation workers face grave health risks from toxic gases (hydrogen sulphide) in sewer pits, skin infections, respiratory diseases, social stigma, and lack of safety gear.
Technological Solutions:
Technological Solutions:
- Sewage Suction Trucks: Mechanised vacuum pumps clean deep drain blockages without human entry.
- Manhole-Cleaning Robots: Robots (such as India's Bandicoot) equipped with cameras and robotic arms descend into manholes to clear sludge.
- Protective Gear: Heavy waterproof suits, oxygen masks, and gas detectors ensure complete worker safety.
CBSE Step-by-Step Marking Scheme
Health hazards and social discrimination faced
2 Marks
Robotic cleaners and mechanised suction trucks as solutions
2 Marks
Q3
What does 'Dignity of Labour' mean? Why is every profession—from a sanitation worker to an engineer—equally essential for society?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Dignity of Labour means that all forms of honest work are honourable, valuable, and deserve equal human respect, with no job considered superior or inferior based on prejudice.
If engineers design bridges, sanitation workers keep towns free from deadly cholera and plague epidemics. If sanitation workers stopped cleaning for just one week, cities would overflow with garbage and disease. Therefore, every job that serves society has equal dignity.
If engineers design bridges, sanitation workers keep towns free from deadly cholera and plague epidemics. If sanitation workers stopped cleaning for just one week, cities would overflow with garbage and disease. Therefore, every job that serves society has equal dignity.
CBSE Step-by-Step Marking Scheme
Definition of dignity of labour and equal human respect
1.5 Marks
Crucial role of sanitation in public disease prevention
1.5 Marks
Q4
Who was Dr. Bhimrao Ramji Ambedkar? What historic provisions did he incorporate in the Indian Constitution to fight untouchability?
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Dr. B.R. Ambedkar (Babasaheb) was the Chief Architect of the Constitution of India, a visionary legal scholar, and a champion of human rights from the Mahar community who suffered severe caste discrimination in childhood.
Constitutional Provisions:
Constitutional Provisions:
- Article 14: Guarantees equality before the law for all citizens irrespective of religion, caste, gender, or birth.
- Article 17: Completely abolishes the practice of Untouchability in any form and declares it a punishable criminal offense.
- Prohibited discrimination in public places, temples, schools, and water wells.
CBSE Step-by-Step Marking Scheme
Identification of Dr. Ambedkar as father of the Constitution
1.5 Marks
Article 17 abolition of untouchability as a punishable crime
1.5 Marks
Equal access to public facilities without caste discrimination
1 Mark
Q5
How can every household practice waste segregation (wet vs dry waste) at home to help municipal sanitation workers?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Households should maintain two separate color-coded waste dustbins:
- Green Bin (Wet Biodegradable Waste): Fruit peels, vegetable trimmings, leftover food, tea leaves, and eggshells. This waste can be turned into rich organic compost.
- Blue Bin (Dry Recyclable Waste): Paper, cardboard, plastic bottles, metal cans, glass, and wrappers. This waste is recycled by scrap industries.
CBSE Step-by-Step Marking Scheme
Green bin for biodegradable wet food waste (composting)
1.5 Marks
Blue bin for dry recyclable materials & worker safety
1.5 Marks
Q6
[Textbook Activity & Question 1] In 'Who will do this Work?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Who will do this Work?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q7
[Textbook Activity & Question 2] In 'Who will do this Work?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Who will do this Work?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 3] In 'Who will do this Work?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Who will do this Work?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 4] In 'Who will do this Work?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Who will do this Work?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 5] In 'Who will do this Work?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Who will do this Work?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 6] In 'Who will do this Work?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Who will do this Work?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 7] In 'Who will do this Work?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Who will do this Work?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 8] In 'Who will do this Work?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Who will do this Work?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 9] In 'Who will do this Work?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Who will do this Work?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 10] In 'Who will do this Work?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Who will do this Work?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 11] In 'Who will do this Work?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Who will do this Work?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 12] In 'Who will do this Work?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Who will do this Work?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 13] In 'Who will do this Work?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Who will do this Work?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 14] In 'Who will do this Work?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Who will do this Work?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 15] In 'Who will do this Work?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Who will do this Work?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 16] In 'Who will do this Work?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Who will do this Work?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 17] In 'Who will do this Work?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Who will do this Work?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Who will do this Work?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
Eradicating Manual Scavenging & Upholding Dignity of Labour
Case Scenario: Mahatma Gandhi and Dr. B.R. Ambedkar strongly condemned the caste-based practice of forcing specific communities to clean dry latrines and carry human excreta. In modern times, the government has banned manual scavenging and promotes robotic sewer cleaners like 'Bandicoot'.
Analytical Task: Why was manual scavenging an inhumane practice, and how does modern robotic technology uphold human dignity and worker safety?
Why Manual Scavenging is Inhumane:
Manual scavenging forced marginalized caste groups to enter toxic underground sewer lines and septic tanks without protective gear, inhaling deadly sewer gases (methane, hydrogen sulphide) that caused fatal asphyxiation and chronic lung diseases. It reinforced untouchability and violated the fundamental constitutional right to life and dignity (Article 21).
Role of Robotic Mechanization:
1. Zero Human Entry: Modern robotic units (such as 'Bandicoot') use multi-axis robotic arms and high-resolution cameras to break sludge and extract clogs remotely.
2. Rehabilitation into Skilled Technicians: Sanitation workers are trained to operate robotic control panels, transitioning from hazardous manual labour to respected technological professionals.
CBSE Assessment Rubric: 2.5 Marks for social justice and health hazard critique + 2.5 Marks for robotic sewer technology and dignity of labour = 5 Marks
17
Afsana Mansuri • Class 5 EVS (Classic CBSE)
Chapter 17: Across the Wall
Afsana Mansuri, Gender Stereotypes, NBA Mumbai, Team Spirit & Sports Equality
Chapter Highlights, Environmental Insights & Scientific Ideas
- Afsana Mansuri, a young girl from a poor Mumbai slum household who washed utensils, broke gender barriers to become a star basketball player for NBA (Nagpada Basketball Association).
- Gender discrimination: societal prejudice that girls should only cook, do household chores, and not participate in sports.
- True team spirit means playing for the collective victory of the team rather than individual glory, encouraging teammates during errors.
- Coach Noor Khan provided equal training, discipline, and emotional encouragement to boys and girls alike.
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
What social 'wall' did Afsana Mansuri have to cross to become a successful basketball player?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
The 'wall' was the invisible wall of gender discrimination, poverty, and societal prejudice. Her mother worked as a domestic help and initially opposed her playing, telling her that girls from poor families are meant to do household chores, wash utensils, and study quietly, not run around in shorts on sports grounds. Afsana overcame this resistance through sheer determination, discipline, and the support of her coach.
CBSE Step-by-Step Marking Scheme
Explanation of gender barrier and poverty constraints
1.5 Marks
Overcoming parental and societal prejudice through dedication
1.5 Marks
Q2
What is 'team spirit'? Why is mutual respect and unity more important in a team than individual talent?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Team Spirit is the feeling of togetherness, mutual respect, and shared purpose among all players in a sports squad.
Even if a team has extraordinarily talented individual players, they will lose if they argue, boast, or blame each other. True team spirit means celebrating each other's points, covering up for a teammate's mistake without shouting, and playing for the team's victory rather than personal statistics.
Even if a team has extraordinarily talented individual players, they will lose if they argue, boast, or blame each other. True team spirit means celebrating each other's points, covering up for a teammate's mistake without shouting, and playing for the team's victory rather than personal statistics.
CBSE Step-by-Step Marking Scheme
Definition of team spirit as collective unity and mutual trust
1.5 Marks
Why cooperation surpasses isolated individual skill
1.5 Marks
Q3
How did Coach Noor Khan inspire and train the young girls of the Nagpada Basketball Association?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Coach Noor Khan treated girls and boys with complete equality and professional discipline:
- He taught them foundational dribbling, passing, and shooting drills with rigorous physical conditioning.
- He constantly boosted their confidence, telling them: "Play like a player, not like a girl."
- He convinced skeptical, orthodox parents that girls from modest slum households could excel in competitive sports and bring pride to their families and community.
CBSE Step-by-Step Marking Scheme
Equal training and professional athletic discipline
1.5 Marks
Building psychological confidence and convincing parents
1.5 Marks
Q4
What life skills and psychological strengths do children develop by actively participating in team sports?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Participating in sports develops essential lifelong competencies:
- Physical Fitness & Stamina: Strengthens bones, heart, and motor coordination.
- Discipline & Time Management: Balancing rigorous practice schedules with school homework.
- Resilience & Emotional Control: Learning to accept defeat gracefully, analyzing mistakes, and persevering to win.
- Cooperation: Working harmoniously with diverse individuals towards a shared team goal.
CBSE Step-by-Step Marking Scheme
Physical fitness and discipline
1.5 Marks
Emotional resilience, handling defeat, and cooperative teamwork
1.5 Marks
Q5
Why is it unfair to treat boys and girls differently at home regarding household chores and sports opportunities?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Treating boys and girls unequally restricts human potential and reinforces harmful gender stereotypes:
- Both boys and girls have equal mental, intellectual, and physical capabilities to achieve excellence in athletics, sciences, and arts.
- Household duties like cooking, cleaning, and washing are essential life skills that every person must learn regardless of gender.
- Denying girls the opportunity to play outside hampers their health, independence, and career horizons.
CBSE Step-by-Step Marking Scheme
Equal capabilities of boys and girls in all fields
1.5 Marks
Household chores as universal life skills for everyone
1.5 Marks
Q6
[Textbook Activity & Question 1] In 'Across the Wall', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Across the Wall
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q7
[Textbook Activity & Question 2] In 'Across the Wall', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Across the Wall
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 3] In 'Across the Wall', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Across the Wall
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 4] In 'Across the Wall', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Across the Wall
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 5] In 'Across the Wall', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Across the Wall
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 6] In 'Across the Wall', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Across the Wall
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 7] In 'Across the Wall', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Across the Wall
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 8] In 'Across the Wall', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Across the Wall
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 9] In 'Across the Wall', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Across the Wall
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 10] In 'Across the Wall', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Across the Wall
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 11] In 'Across the Wall', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Across the Wall
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 12] In 'Across the Wall', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Across the Wall
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 13] In 'Across the Wall', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Across the Wall
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 14] In 'Across the Wall', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Across the Wall
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 15] In 'Across the Wall', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Across the Wall
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 16] In 'Across the Wall', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Across the Wall
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 17] In 'Across the Wall', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Across the Wall
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Across the Wall, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
Nagpada Basketball Association & Breaking Gender Barriers
Case Scenario: Afsana Mansuri, a young girl from a poor Mumbai slum whose mother worked as a domestic help, faced intense social opposition when she wanted to play basketball. With coach Noor Khan's guidance, Afsana and her teammates broke social stereotypes to become district champions.
Analytical Task: What social and family obstacles do young girls from underprivileged backgrounds face in sports, and how does team sports empower young women?
Obstacles Faced by Young Girls:
1. Gender Stereotypes: Society often expects girls to focus exclusively on cooking, cleaning, and sibling care, viewing competitive sports as a male domain.
2. Safety Concerns & Lack of Equipment: Families worry about sports attire (shorts), late evening practices, and lack of money to buy professional sports shoes.
Empowerment Through Team Sports:
- Confidence and Leadership: Sports teach girls to voice their opinions, strategize under pressure, and lead teams fearlessly.
- Team Spirit over Ego: Playing together teaches mutual respect, cooperation, and resilience against failure.
- Breaking Social Taboos: Their success inspires entire communities to encourage daughters to pursue sports and higher education.
CBSE Assessment Rubric: 2.5 Marks for identifying socio-cultural obstacles + 2.5 Marks for leadership and community transformation impact = 5 Marks
18
Dam Construction Displacement • Class 5 EVS (Classic CBSE)
Chapter 18: No Place for Us?
Dam Construction Displacement, Jatrya Bhai's Story, Village Harmony vs Urban Slum Struggles
Chapter Highlights, Environmental Insights & Scientific Ideas
- Jatrya Bhai lived happily in Khedi village surrounded by lush green forests and the river, where community members shared farm work, songs, and food.
- A large river dam was constructed, submerging Khedi village and forcing residents to leave their ancestral land.
- Relocation struggles in Sinduri village: infertile rocky land, costly medical care, lack of schooling, and mockery from local residents.
- Life in Mumbai slums: cramped, expensive tin-roof rooms, dirty gutters, daily wage exploitation, and loneliness.
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
Describe the harmonious community life of Khedi village before the dam was built. How did villagers support one another?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
In Khedi village, people lived in peaceful harmony with nature:
- Children learned together to dance, sing, play flute, make clay pots, and recognize birds and medicinal forest herbs.
- Villagers worked together as one big family: during harvests or weddings, everyone pitched in, and elders resolved disputes lovingly without police or courts.
CBSE Step-by-Step Marking Scheme
Learning from nature and forest knowledge
1.5 Marks
Community solidarity and mutual assistance in farming and festivals
1.5 Marks
Q2
What are the advantages and disadvantages of constructing large river dams for development?
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Advantages of Dams:
- Generates clean, renewable hydroelectric power.
- Provides irrigation canals to supply water to drought-prone farms.
- Helps control seasonal river flooding and supplies drinking water to distant cities.
- Massive submergence of fertile agricultural lands and ancient forest ecosystems.
- Forced displacement of indigenous villagers who lose their homes, livelihood, and community identity without fair compensation.
CBSE Step-by-Step Marking Scheme
Listing 2-3 key benefits (hydroelectricity, irrigation, flood control)
2 Marks
Listing 2 severe drawbacks (displacement, environmental destruction)
2 Marks
Q3
Describe the traumatic emotional and physical impact of forced displacement on tribal communities when dams or factories are built.
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Forced displacement shatters the entire social, economic, and cultural fabric of tribal families:
- Loss of Ancestral Heritage: Villagers leave behind sacred riverbanks, cremation grounds of ancestors, and ancient forests where their families lived for generations.
- Economic Ruin: Independent farmers become landless casual day-labourers in cities, struggling to pay for water, electricity, food, and rent.
- Cultural Alienation: Folk songs, herbal medicinal knowledge, and community solidarity disappear in crowded urban slums where neighbours do not know or trust each other.
CBSE Step-by-Step Marking Scheme
Severance from ancestral land and sacred natural sites
1.5 Marks
Economic descent into landless wage exploitation in slums
1.5 Marks
Loss of indigenous culture, songs, and communal trust
1 Mark
Q4
What fundamental facilities should the government ensure are fully established before relocating displaced families?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Before any relocation takes place, the government must provide:
- Fertile, irrigable agricultural land equal in productivity to what was submerged.
- Permanent pucca houses equipped with free potable water taps, electricity connections, and sanitation drainage.
- Proper government schools, primary health clinics, and accessible all-weather roads.
- Guaranteed rehabilitation employment or livelihood training for youth.
CBSE Step-by-Step Marking Scheme
Fertile agricultural land and permanent pucca housing
1.5 Marks
Schools, healthcare, sanitation, and livelihood rehabilitation
1.5 Marks
Q5
Compare the environmental sounds and air quality of Khedi village with the urban slums of Mumbai.
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
- Khedi Village: Clean, fresh mountain air smelling of wet earth and pine trees. Sounds of rushing river water, leaves rustling in the breeze, birds singing melodiously, and children laughing.
- Mumbai Slums: Air polluted with vehicular exhaust smoke, foul stench from open drains, burning plastic, and deafening traffic horns, train whistles, and factory sirens.
CBSE Step-by-Step Marking Scheme
Sensory description of Khedi's pure air and natural sounds
1.5 Marks
Sensory description of urban slum pollution, stench, and noise
1.5 Marks
Q6
[Textbook Activity & Question 1] In 'No Place for Us?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • No Place for Us?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q7
[Textbook Activity & Question 2] In 'No Place for Us?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • No Place for Us?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 3] In 'No Place for Us?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • No Place for Us?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 4] In 'No Place for Us?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • No Place for Us?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 5] In 'No Place for Us?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • No Place for Us?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 6] In 'No Place for Us?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • No Place for Us?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 7] In 'No Place for Us?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • No Place for Us?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 8] In 'No Place for Us?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • No Place for Us?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 9] In 'No Place for Us?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • No Place for Us?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 10] In 'No Place for Us?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • No Place for Us?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 11] In 'No Place for Us?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • No Place for Us?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 12] In 'No Place for Us?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • No Place for Us?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 13] In 'No Place for Us?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • No Place for Us?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 14] In 'No Place for Us?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • No Place for Us?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 15] In 'No Place for Us?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • No Place for Us?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 16] In 'No Place for Us?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • No Place for Us?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 17] In 'No Place for Us?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • No Place for Us?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In No Place for Us?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
Tehri Dam Construction & The Displacement of Khedi Village
Case Scenario: Jatrya Bhai's peaceful riverbank village of Khedi was submerged under a massive reservoir created by a hydroelectric dam. Although promised agricultural land and modern schools in Sinduri, the displaced villagers received barren stony plots, expensive electricity bills, and hostility in Mumbai.
Analytical Task: Analyze the ethical, social, and economic consequences of large development projects like dams on indigenous rural populations.
Consequences of Forced Displacement:
1. Loss of Culture and Identity: Villages like Khedi lived in harmony with rivers and forests for centuries. Uprooting them destroys traditional songs, folk knowledge, and community solidarity.
2. Flawed Rehabilitation Promises: Displaced families are often allotted unfertile rocky land without functioning schools, hospitals, or irrigation, sinking them into immediate poverty.
3. Urban Alienation and Poverty: When forced to migrate to mega-cities like Mumbai, skilled rural farmers become landless labourers living in cramped, unhygienic slums, struggling to afford basic drinking water and electricity.
Policy Imperative:
Development projects must obtain informed consent, provide genuine fertile land compensation, and ensure displaced communities receive direct shares in generated electricity and profits.
CBSE Assessment Rubric: 2 Marks for loss of community culture + 2 Marks for rehabilitation failures + 1 Mark for equitable policy recommendation = 5 Marks
19
Damjibhai vs Hasmukh • Class 5 EVS (Classic CBSE)
Chapter 19: A Seed tells a Farmer's Story
Damjibhai vs Hasmukh, Traditional Organic Farming vs Chemical Farming & Farmer Debt Trap
Chapter Highlights, Environmental Insights & Scientific Ideas
- Damjibhai practiced traditional sustainable farming in Gujarat: saving indigenous seeds in dried gourds, using neem leaves against pests, and enriching soil with cow dung manure.
- Hasmukh adopted modern farming: high-yield hybrid seeds, chemical fertilizers, synthetic insecticides, tube-well electric irrigation, and tractor bank loans.
- Consequences of excessive chemical farming: soil loses natural fertility, crops require more and more expensive fertilizers, underground water tables plummet, and farmers fall into bank debt traps.
- Traditional winter dish 'Undhiyu' cooked in inverted clay pots over hot coal pits.
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
How did Damjibhai preserve seeds from year to year? Compare his traditional farming methods with his son Hasmukh's modern practices.
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Damjibhai's Traditional Farming:
Kept the best ripe bajra seeds in dried gourds (lauki) sealed with mud, accompanied by neem leaves to protect from insect pests. Soil was nourished with organic cow dung and crop rotation.
Hasmukh's Modern Farming: Bought expensive hybrid seeds from the market every season. Replaced cow dung with chemical fertilizers and sprayed synthetic pesticides. Bought a tractor and dug deep electric borewells.
Outcome: Initially profits rose, but soon chemical overuse hardened the soil, underground water dropped, and earnings were swallowed by bank loan interest.
Hasmukh's Modern Farming: Bought expensive hybrid seeds from the market every season. Replaced cow dung with chemical fertilizers and sprayed synthetic pesticides. Bought a tractor and dug deep electric borewells.
Outcome: Initially profits rose, but soon chemical overuse hardened the soil, underground water dropped, and earnings were swallowed by bank loan interest.
CBSE Step-by-Step Marking Scheme
Damjibhai's natural seed saving and organic techniques
1.5 Marks
Hasmukh's chemical, hybrid, and mechanised inputs
1.5 Marks
Long-term soil degradation and debt consequences
1 Mark
Q2
Why are earthworms called a farmer's best friends in organic farming?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Earthworms are nature's natural ploughmen:
- They burrow continuously through the soil, creating countless tunnels that loosen the soil and allow air and water to penetrate deep to plant roots.
- They consume dead leaves and organic matter, producing rich worm castings (vermicompost) that contain vital minerals and natural nutrients for plants.
CBSE Step-by-Step Marking Scheme
Soil aeration through burrowing tunnels
1.5 Marks
Production of rich nutrient-dense vermicompost castings
1.5 Marks
Q3
Why did modern chemical farming, which initially brought high profits, ultimately lead Hasmukh into severe debt?
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Hasmukh's modern agriculture entered an unsustainable downward spiral:
- Skyrocketing Input Costs: Hybrid seeds cannot be saved from the harvest; new seeds, chemical fertilizers, and synthetic pesticides had to be bought from companies every single season at rising prices.
- Depletion of Natural Soil Fertility: Chemical fertilizers destroyed soil microorganisms and earthworms, turning fertile soil hard and dead. Every year, more and more chemicals were needed to harvest the same quantity of crop.
- Water Table Collapse: Electric borewells drained underground aquifers dry, forcing the installation of deeper, costlier submersible pumps.
- Debt Trap: When crop market prices crashed or pests destroyed crops, farm income could not even pay the interest on bank tractor and pump loans.
CBSE Step-by-Step Marking Scheme
Rising costs of non-reusable hybrid seeds and chemicals
1.5 Marks
Destruction of earthworms and soil fertility exhaustion
1.5 Marks
Groundwater depletion and loan default debt trap
1 Mark
Q4
What is 'Undhiyu'? How was it traditionally cooked by Gujarati farming families during the winter harvest?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Undhiyu is a famous Gujarati winter harvest specialty:
- Fresh seasonal vegetables (broad beans, baby eggplants, potatoes, sweet potatoes, yam, fenugreek dumplings / muthia) are tossed with aromatic spices and fresh coriander.
- The ingredients are packed into an earthen clay pot (matka), and its mouth is sealed tightly with dough.
- The pot is placed upside down ('Undhu') inside a pit filled with glowing hot wood coals. The vegetables cook slowly in their own steam, developing a divine smoky flavor, served with bajra rotis and fresh butter.
CBSE Step-by-Step Marking Scheme
Composition of winter seasonal vegetables and spices
1.5 Marks
Inverted sealed clay pot slow-cooking over coals (Undhu meaning upside down)
1.5 Marks
Q5
What are indigenous (desi) heirloom seeds, and why are agricultural scientists urging farmers to conserve traditional seed banks?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Indigenous (Desi) Seeds are traditional crop varieties nurtured and selected by generations of farmers over hundreds of years:
- They possess natural genetic resilience against local droughts, floods, and native insect attacks without requiring synthetic chemical sprays.
- They can be harvested, dried, and replanted every year for free.
- Conserving heirloom seed banks preserves crop biodiversity, food security, and regional culinary heritage.
CBSE Step-by-Step Marking Scheme
Definition of traditional heirloom seeds and self-replacing nature
1.5 Marks
Natural pest/climate resistance and biodiversity preservation
1.5 Marks
Q6
[Textbook Activity & Question 1] In 'A Seed tells a Farmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • A Seed tells a Farmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q7
[Textbook Activity & Question 2] In 'A Seed tells a Farmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • A Seed tells a Farmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 3] In 'A Seed tells a Farmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • A Seed tells a Farmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 4] In 'A Seed tells a Farmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • A Seed tells a Farmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 5] In 'A Seed tells a Farmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • A Seed tells a Farmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 6] In 'A Seed tells a Farmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • A Seed tells a Farmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 7] In 'A Seed tells a Farmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • A Seed tells a Farmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 8] In 'A Seed tells a Farmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • A Seed tells a Farmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 9] In 'A Seed tells a Farmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • A Seed tells a Farmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 10] In 'A Seed tells a Farmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • A Seed tells a Farmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 11] In 'A Seed tells a Farmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • A Seed tells a Farmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 12] In 'A Seed tells a Farmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • A Seed tells a Farmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 13] In 'A Seed tells a Farmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • A Seed tells a Farmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 14] In 'A Seed tells a Farmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • A Seed tells a Farmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 15] In 'A Seed tells a Farmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • A Seed tells a Farmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 16] In 'A Seed tells a Farmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • A Seed tells a Farmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 17] In 'A Seed tells a Farmer's Story', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • A Seed tells a Farmer's Story
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In A Seed tells a Farmer's Story, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
Damjibhai's Traditional Farming vs Hasmukh's Chemical Agriculture
Case Scenario: An old Bajra seed reminisces how Damjibhai grew mixed crops with cow dung manure, neem leaf pest repellent, and community seed sharing. His son Hasmukh switched to expensive hybrid seeds, synthetic urea, borewell irrigation, and bank loans, leaving his grandson Paresh trapped in debt.
Analytical Task: Contrast the ecological sustainability of Damjibhai's traditional farming with Hasmukh's modern chemical farming, explaining why chemical farming leads to long-term soil degradation and financial debt.
Ecological Contrast:
- Damjibhai's Organic System: Used heirloom seeds, cow dung compost, and neem leaves. Earthworms aerated the soil, preserving moisture and biological fertility for decades at virtually zero monetary cost.
- Hasmukh's Chemical System: Synthetic fertilizers provided temporary high yields but destroyed soil microorganisms, turning fertile soil sterile. Intensive borewell pumping depleted groundwater tables.
CBSE Assessment Rubric: 2.5 Marks for ecological comparison (earthworms vs chemical sterilisation) + 2.5 Marks for debt cycle breakdown = 5 Marks
20
Suryamani's Torang • Class 5 EVS (Classic CBSE)
Chapter 20: Whose Forests?
Suryamani's Torang, Kuduk Culture, Right to Forest Act 2007 & Jhoom Farming in Mizoram
Chapter Highlights, Environmental Insights & Scientific Ideas
- Suryamani, a tribal woman from Jharkhand, graduated college and founded 'Torang' (meaning 'jungle' in Kuduk language) to protect Adivasi culture, herbs, and songs.
- Forests are collective community banks: tribals take only what they need, never plundering trees for selfish greed.
- Right to Forest Act (FRA) 2007: people living in forests for at least 25 years have legal rights over the forest land, produce, and conservation decisions.
- Jhoom farming (shifting cultivation) in Mizoram: bamboo patches slashed and burned as fertilizer, crops grown naturally without chemical pesticides, and community land allocated by lucky lottery.
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
Who is Suryamani and what is 'Torang'? What rights are guaranteed under the Right to Forest Act 2007?
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Suryamani: A courageous 'Girl Star' from a Jharkhand Adivasi family who loved the forest. She studied hard, completed her B.A., and founded a community cultural centre called Torang ('Jungle' in Kuduk language) to preserve tribal folk music, herbal medicines, and indigenous Kuduk traditions.
Right to Forest Act (2007):
Right to Forest Act (2007):
- Grants legal land rights to forest dwellers who have lived in the forest for at least 25 years.
- Recognizes their ownership over forest produce (fruits, roots, medicinal plants).
- Affirms that gram sabhas (village councils) have the authority to manage and protect forest conservation.
CBSE Step-by-Step Marking Scheme
Suryamani's background and establishment of Torang
1.5 Marks
25-year residency criterion under FRA 2007
1 Mark
Legal ownership of forest produce and Gram Sabha governance
1.5 Marks
Q2
Describe the unique traditional practice of Jhoom farming (shifting cultivation) in Mizoram.
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Jhoom Agriculture in Mizoram:
- After cutting a crop, the land is left untouched for several years so soil regains fertility and bamboo groves grow back.
- The bamboo is slashed and burned; the ash acts as rich natural fertilizer. Burning is done carefully so flames do not spread into the main forest.
- The land is not ploughed deep; the soil is lightly scraped with a hoe and seeds of rice, maize, and chillies are dropped.
- Land belongs to the entire village and is distributed among families through a fair community lottery.
CBSE Step-by-Step Marking Scheme
Fallow period and ash fertilization
1.5 Marks
Light hoeing instead of deep ploughing
1 Mark
Community land ownership via lottery system
1.5 Marks
Q3
Why did Suryamani say: 'Forests are our collective bank (Sajha Bank)'? How do tribal beliefs prevent overexploitation of nature?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Suryamani explained that for Adivasis, the forest is not a private money-making resource for one individual to plunder. It is a shared community heritage that belongs equally to everyone, including future generations:
- Tribals take only what they immediately require for survival—firewood, edible roots, fallen leaves, and medicinal herbs.
- They never cut green flowering trees, kill pregnant animals, or exhaust natural reserves. Unlike commercial timber corporations, tribals live as caretakers of the forest.
CBSE Step-by-Step Marking Scheme
Concept of collective intergenerational common bank (Sajha Bank)
1.5 Marks
Harvesting only sustainable needs without commercial overexploitation
1.5 Marks
Q4
What is the 'Cheraw' dance performed in Mizoram? On what occasion is it celebrated?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
The Cheraw Dance is the celebrated traditional folk dance of Mizoram performed during the post-harvest festival:
- Pairs of men sit facing each other on the ground, holding long bamboo poles. They beat the bamboos on the ground and against each other to a rhythmic musical beat.
- Women dressed in colorful traditional attire (Puan) step gracefully in and out of the closing and opening bamboo pairs, keeping perfect rhythmic synchronization with the beats.
CBSE Step-by-Step Marking Scheme
Celebration of post-harvest festival in Mizoram
1 Mark
Rhythmic clapping of bamboo poles by men and stepping by women
2 Marks
Q5
Explain why clearing natural forests to build commercial monoculture eucalyptus plantations harms biodiversity and groundwater.
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
A natural forest contains hundreds of diverse plant species, giant canopy trees, creepers, and shrubs that shelter diverse birds, mammals, and pollinating insects:
- Commercial eucalyptus monocultures support zero wildlife food or nesting sites.
- Eucalyptus trees consume colossal quantities of groundwater through taproots, causing local wells and streams to dry up completely.
- Their fallen leaves prevent native shrubs from growing, destroying topsoil ecology.
CBSE Step-by-Step Marking Scheme
Contrast between multi-species biodiverse forests vs monocultures
1.5 Marks
Massive groundwater depletion and soil damage by eucalyptus
1.5 Marks
Q6
[Textbook Activity & Question 1] In 'Whose Forests?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Whose Forests?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q7
[Textbook Activity & Question 2] In 'Whose Forests?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Whose Forests?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 3] In 'Whose Forests?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Whose Forests?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 4] In 'Whose Forests?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Whose Forests?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 5] In 'Whose Forests?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Whose Forests?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 6] In 'Whose Forests?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Whose Forests?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 7] In 'Whose Forests?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Whose Forests?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 8] In 'Whose Forests?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Whose Forests?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 9] In 'Whose Forests?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Whose Forests?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 10] In 'Whose Forests?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Whose Forests?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 11] In 'Whose Forests?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Whose Forests?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 12] In 'Whose Forests?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Whose Forests?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 13] In 'Whose Forests?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Whose Forests?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 14] In 'Whose Forests?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Whose Forests?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 15] In 'Whose Forests?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Whose Forests?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 16] In 'Whose Forests?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Whose Forests?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 17] In 'Whose Forests?', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Whose Forests?
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Whose Forests?, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
Suryamani Bhagat & The Kuduk Community's 'Torang' Movement
Case Scenario: Suryamani Bhagat, an Adivasi girl from Jharkhand, loved the forest and fought for the rights of the Kuduk tribe. She graduated from college with the help of Vasavi didi and established 'Torang' (meaning jungle in Kuduk language) to protect tribal culture, traditional herbal medicine, and the Forest Rights Act 2007.
Analytical Task: What are the core legal provisions of the Forest Rights Act 2007, and why are Adivasis indispensable for the preservation of India's forests?
Core Provisions of the Forest Rights Act 2007:
The Act recognizes that people who have been living in forest areas for at least 25 years have legal rights over the forest land and what grows on it:
- They cannot be evicted or displaced arbitrarily by forest departments or private corporations.
- The village Gram Sabha (community council) has the legal authority to protect and manage local forest resources.
CBSE Assessment Rubric: 2.5 Marks for the 25-year residency right and Gram Sabha authority + 2.5 Marks for Adivasi ecological stewardship = 5 Marks
21
Inherited vs Acquired Traits • Class 5 EVS (Classic CBSE)
Chapter 21: Like Father, Like Daughter
Inherited vs Acquired Traits, Twins, Gregor Mendel's Pea Experiments & Polio Facts
Chapter Highlights, Environmental Insights & Scientific Ideas
- Inherited traits: physical characteristics passed from biological parents to children through genes (eye colour, curly hair, dimples, free/attached earlobes).
- Acquired skills: abilities learned through education, practice, and environment (swimming, playing tabla, cycling, language accents).
- Identical twins: share identical genes, but environmental upbringing influences habits, skills, and personality.
- Gregor Mendel discovered the laws of inheritance through thousands of experiments on pea plants (traits inherit in pairs, like tall vs dwarf).
- Polio is caused by a virus (Poliovirus); it is NOT hereditary. It can be completely eradicated through Pulse Polio oral vaccine drops.
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
Differentiate between an inherited trait and an acquired skill with two examples of each.
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
- Inherited Traits: Physical characteristics passed from parents to children through genetics from birth. Examples: Eye colour, natural curly or straight hair, facial dimples, attached earlobes.
- Acquired Skills: Abilities, knowledge, and habits that a person learns through practice, schooling, and environment after birth. Examples: Playing the harmonium/piano, swimming, cycling, speaking multiple languages.
CBSE Step-by-Step Marking Scheme
Definition and 2 examples of inherited traits
1.5 Marks
Definition and 2 examples of acquired skills
1.5 Marks
Q2
Who was Gregor Mendel? What groundbreaking discovery did he make regarding pea plants?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Gregor Mendel was an Austrian monk born in 1822 in a poor farming family. Over seven years, he conducted meticulous breeding experiments on over 28,000 pea plants in his monastery garden:
- He discovered that plant traits are passed down in discrete pairs and do not blend into an intermediate mix.
- For instance, crossing tall and dwarf pea plants produced either tall or dwarf offspring, not medium-height plants; seed coats were either smooth or wrinkled, never halfway.
- His work laid the fundamental foundation for the modern science of genetics.
CBSE Step-by-Step Marking Scheme
Identification of Gregor Mendel as father of genetics
1 Mark
Discovery that traits inherit in discrete pairs without blending
2 Marks
Q3
Is Polio hereditary? A relative told Saroja that her newborn might catch polio because her aunt had polio. Is this scientifically true? What causes polio, and how can it be prevented?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
No, this is completely false scientifically.
- Polio is NOT hereditary: Polio is an infectious disease caused by a microscopic virus (Poliovirus), not by parental genes. It never passes down through family lineage or birth traits.
- Transmission: The poliovirus spreads through contaminated drinking water, unhygienic food, or dirty hands, attacking the spinal cord and nervous system, leading to paralysis of limbs (most commonly legs).
- Prevention: Polio can be completely prevented through the Pulse Polio oral vaccine drops (दो बूंद जिंदगी की) given to every child under five years of age.
CBSE Step-by-Step Marking Scheme
Refutation of hereditary myth and identifying viral cause
1 Mark
Mode of transmission through contaminated water/food
1 Mark
Prevention via Pulse Polio oral vaccination drops
1 Mark
Q4
Saroja and Suvasini are identical twins who look completely alike. Why can Saroja sing Tamil songs and speak Marathi fluently while Suvasini cannot? How does environment shape abilities alongside inherited traits?
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Although Saroja and Suvasini are identical twins sharing identical genetic traits from their parents (giving them matching faces, hair, and eye shape), their abilities and language skills developed differently because of their upbringing environment:
- Saroja's Environment: Saroja was brought up by her uncle in an environment where people spoke Marathi and listened to classical Tamil music, so she acquired fluency in Marathi and learned to sing songs through daily listening and practice.
- Suvasini's Environment: Suvasini lived in a different home where these languages and music were not practiced, so she never acquired those specific skills.
- Scientific Conclusion: Physical traits (height, facial features, hair type) are inherited from biological parents, whereas languages, arts, sports, and intellectual skills are acquired abilities shaped by environment, schooling, practice, and social exposure.
CBSE Step-by-Step Marking Scheme
Explanation of identical genetic origin for physical features
1.5 Marks
Impact of differing upbringing environments on language and singing
1.5 Marks
Conclusion distinguishing inherited traits from acquired skills
1 Mark
Q5
List four physical traits that children commonly inherit from their parents or grandparents, and three skills or habits that must be acquired through practice.
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
- Four Inherited Physical Traits:
- Colour of eyes (e.g. brown, black, hazel).
- Hair texture (curly, wavy, or silky straight).
- Attached or free earlobes.
- Facial dimples when smiling, or distinctive shape of nose and chin.
- Three Acquired Skills/Habits:
- Riding a bicycle or swimming.
- Reading, writing, and speaking languages.
- Playing a musical instrument (harmonium, flute, guitar).
CBSE Step-by-Step Marking Scheme
Four accurate inherited biological traits
1.5 Marks
Three accurate acquired behavioural/motor skills
1.5 Marks
Q6
[Textbook Activity & Question 1] In 'Like Father, Like Daughter', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Like Father, Like Daughter
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q7
[Textbook Activity & Question 2] In 'Like Father, Like Daughter', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Like Father, Like Daughter
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 3] In 'Like Father, Like Daughter', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Like Father, Like Daughter
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 4] In 'Like Father, Like Daughter', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Like Father, Like Daughter
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 5] In 'Like Father, Like Daughter', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Like Father, Like Daughter
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 6] In 'Like Father, Like Daughter', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Like Father, Like Daughter
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 7] In 'Like Father, Like Daughter', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Like Father, Like Daughter
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 8] In 'Like Father, Like Daughter', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Like Father, Like Daughter
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 9] In 'Like Father, Like Daughter', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Like Father, Like Daughter
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 10] In 'Like Father, Like Daughter', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • Like Father, Like Daughter
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 11] In 'Like Father, Like Daughter', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • Like Father, Like Daughter
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 12] In 'Like Father, Like Daughter', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • Like Father, Like Daughter
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 13] In 'Like Father, Like Daughter', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • Like Father, Like Daughter
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 14] In 'Like Father, Like Daughter', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • Like Father, Like Daughter
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 15] In 'Like Father, Like Daughter', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • Like Father, Like Daughter
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 16] In 'Like Father, Like Daughter', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • Like Father, Like Daughter
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 17] In 'Like Father, Like Daughter', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • Like Father, Like Daughter
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In Like Father, Like Daughter, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
Mendelian Inheritance & The Eradication of Polio
Case Scenario: Saroja and Suvasini are identical twins separated at birth; one was raised by an uncle in Pune (learning karate and music) while the other stayed in Chennai (speaking Tamil and doing household chores). Meanwhile, a health worker arrived at their home to administer two drops of Pulse Polio oral vaccine to infants.
Analytical Task: Explain how twin studies help scientists differentiate between genetic heredity and environmental nurture, and explain why administering oral polio vaccine drops to all children under five is essential.
Scientific Value of Twin Studies:
Identical twins share 100% identical genetic DNA inherited from biological parents. By studying identical twins raised in different physical and social settings, scientists can pinpoint which traits are strictly genetic (blood group, facial bone structure, eye colour) and which traits are shaped by environmental nurture (skills like karate, musical talent, language vocabulary, dietary habits).
Importance of Pulse Polio Campaign:
Polio is an infectious viral disease that paralyzes limbs. If even a small pool of children remains unvaccinated, the virus continues to circulate in water and soil. Simultaneous mass administration of oral polio drops ensures community 'herd immunity', preventing virus replication and eradicating the disease entirely from the population.
CBSE Assessment Rubric: 2.5 Marks for twin genetics vs nurture explanation + 2.5 Marks for herd immunity and viral eradication rationale = 5 Marks
22
Dhanu's Story • Class 5 EVS (Classic CBSE)
Chapter 22: On the Move Again
Dhanu's Story, Sugarcane Migrant Labourers, Mukadam Agent System & RTE Educational Disruption
Chapter Highlights, Environmental Insights & Scientific Ideas
- Dhanu's family and other landless agricultural labourers in Maharashtra celebrate Dussehra, after which their nomadic migration begins.
- The 'Mukadam' (money-lending labour contractor) gives loans to poor families during the non-rainy months and contracts them out to sugarcane factories.
- Nomadic cycle: 6 months farming in native village during monsoon; 6 months living in temporary huts made of dried sugarcane leaves near factories.
- Severe educational disruption: children like Dhanu miss school for six months every year, leading to high dropout rates.
- Sustainable solutions: year-round canal irrigation for dual cropping, seasonal residential schools, and government implementation of the Right to Education (RTE) Act.
📖 NCERT Textbook Exercise Solutions & Inquiry Activities (22 Solved Questions)
Q1
Who is a Mukadam? How does the loan system force poor agricultural families into continuous seasonal migration?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
A Mukadam is an agent and money-lender for sugarcane processing factories. During the dry months when there is no rain and no farm work, landless villagers borrow money from the Mukadam to survive. To pay back these loans, families are obligated to work for six months cutting and transporting sugarcane stalks wherever the Mukadam commands, trapping them in an unending cycle of debt and displacement.
CBSE Step-by-Step Marking Scheme
Role of Mukadam as factory agent and money lender
1.5 Marks
Cycle of debt forcing 6-month migration away from village
1.5 Marks
Q2
What difficulties do children like Dhanu face due to their parents' seasonal migration? How can the government ensure their education continues uninterrupted?
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Difficulties Faced by Migrant Children:
- They are pulled out of village school for six months, forgetting previously learned concepts.
- They cannot understand the local language at the new migration sites and end up helping parents carry heavy bundles of cane.
- Many eventually drop out completely and are pushed into child labour.
- Establish Seasonal Residential Hostels in native villages so children can stay, eat, and attend school while parents migrate.
- Introduce Mobile Tent Schools that travel with the migrant caravans.
- Construct canal irrigation networks so farmers can harvest two to three crops a year, eliminating the need to migrate.
CBSE Step-by-Step Marking Scheme
Educational disruption and child labour risks
2 Marks
Residential hostels and mobile schooling solutions
2 Marks
Q3
Why is there no farming work in Dhanu's village from Dussehra until the next rainy season? What modern irrigation methods could help farmers grow crops throughout the year?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
In Dhanu's village, agriculture is almost entirely dependent on seasonal monsoon rains (rainfed farming). Once the rainy season ends after Dussehra, there is no rain for six months, and the soil dries up completely with no local reservoirs or canals.
Modern irrigation solutions to enable round-the-year cultivation:
Modern irrigation solutions to enable round-the-year cultivation:
- Construction of canal networks connecting nearby perennial rivers.
- Installing deep tube wells and solar-powered borewell pumps.
- Building village check-dams, stepwells, and percolation ponds for rainwater harvesting.
- Adopting drip irrigation and sprinkler systems to cultivate low-water winter crops like mustard, gram, and vegetables.
CBSE Step-by-Step Marking Scheme
Explanation of rainfed farming dependency ending at Dussehra
1.5 Marks
Canal, tube well, and drip irrigation solutions for year-round crops
1.5 Marks
Q4
When whole families migrate for six months to work in sugarcane fields, what challenges do the elderly grandparents and young infants left behind in the village face?
Textbook Exercise
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
The seasonal exodus leaves vulnerable family members in extreme hardship:
- Isolation and Lack of Care: Frail, elderly grandparents who cannot walk or work are left alone in deserted village houses. When they fall ill, there is no one nearby to cook food, fetch drinking water, or take them to a doctor.
- Emotional Distress: Grandparents deeply miss their children and grandchildren, suffering from loneliness and depression.
- Infant Neglect: Infants carried by mothers to the sugarcane fields are exposed to stinging cold, dust, smoke from sugar mills, and lack of clean drinking water, leading to frequent illnesses.
CBSE Step-by-Step Marking Scheme
Physical difficulties and healthcare crisis for elderly left alone
1.5 Marks
Emotional distress and health hazards for infants in harsh field conditions
1.5 Marks
Q5
Compare Dhanu's family life in their village home with their life in the temporary huts ('jhuggi' made of sugarcane leaves) near the sugar factory.
Textbook Exercise
4 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Comparison between Village Life and Migrant Camp Life:
| Aspect | Life in Native Village | Life at Sugarcane Factory Camp |
|---|---|---|
| Shelter | Permanent, sturdy ancestral house with separate rooms and courtyard. | Fragile makeshift huts ('kopas') made of dried sugarcane leaves and bamboo. |
| Daily Food | Fresh home-cooked meals, milk, festive sweets like Puran Poli during Dussehra. | Dry rotis cooked early morning over smoky wood fires, eaten cold with jaggery or chilli paste. |
| Schooling | Children attend regular village government school daily with friends. | Schooling is completely halted; children help load heavy cane bundles. |
| Working Hours | Daytime farming with leisure, festival celebrations, and family bonding. | Gruelling 16-hour shifts from 4 AM, standing in long factory queues at night. |
CBSE Step-by-Step Marking Scheme
Contrast in shelter and housing quality
1 Mark
Contrast in food nutrition and daily meals
1 Mark
Contrast in children's education and schooling continuity
1 Mark
Contrast in working conditions and daily routine
1 Mark
Q6
[Textbook Activity & Question 1] In 'On the Move Again', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • On the Move Again
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q7
[Textbook Activity & Question 2] In 'On the Move Again', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • On the Move Again
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q8
[Textbook Activity & Question 3] In 'On the Move Again', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • On the Move Again
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q9
[Textbook Activity & Question 4] In 'On the Move Again', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • On the Move Again
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q10
[Textbook Activity & Question 5] In 'On the Move Again', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • On the Move Again
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q11
[Textbook Activity & Question 6] In 'On the Move Again', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • On the Move Again
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q12
[Textbook Activity & Question 7] In 'On the Move Again', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • On the Move Again
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q13
[Textbook Activity & Question 8] In 'On the Move Again', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • On the Move Again
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q14
[Textbook Activity & Question 9] In 'On the Move Again', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • On the Move Again
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q15
[Textbook Activity & Question 10] In 'On the Move Again', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Find Out and Write • Observational Field Study • On the Move Again
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q16
[Textbook Activity & Question 11] In 'On the Move Again', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Scientific Investigation • Ecosystem Relationships • On the Move Again
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q17
[Textbook Activity & Question 12] In 'On the Move Again', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Traditional Wisdom & Community Stewardship • Conservation • On the Move Again
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q18
[Textbook Activity & Question 13] In 'On the Move Again', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Survey & Data Collection • Experiential Inquiry • On the Move Again
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q19
[Textbook Activity & Question 14] In 'On the Move Again', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Health, Diet & Human Biology • Nutritional Science • On the Move Again
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q20
[Textbook Activity & Question 15] In 'On the Move Again', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Disaster Preparedness & Climate Resilience • Geography • On the Move Again
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q21
[Textbook Activity & Question 16] In 'On the Move Again', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Biodiversity & Habitat Adaptations • Wildlife Protection • On the Move Again
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
Q22
[Textbook Activity & Question 17] In 'On the Move Again', describe how students can conduct an empirical investigation or discussion on this topic and explain the scientific principles involved.
Think and Discuss • Environmental Science & Ecology • On the Move Again
3 Marks
✅ Step-by-Step Model Answer & Scientific Explanation:
Scientific Model Answer & Environmental Analysis:
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
1. Field Inquiry / Observation: In On the Move Again, students examine real-world ecological relationships, habitat dependencies, and sustainable environmental practices.
2. Scientific Core Principles: Applying primary scientific methods—such as formulating a hypothesis, measuring field parameters, and recording observations in a nature journal—reveals direct linkages between human communities and natural cycles.
3. Stewardship Conclusion: Understanding these concepts cultivates empathy for living organisms and empowers students to implement eco-friendly conservation measures in daily life.
CBSE Step-by-Step Marking Scheme
Observation methodology & identification of ecological concepts
1.0 M
Scientific explanation of natural cause-and-effect processes
1.0 M
Actionable conservation recommendations stated clearly
1.0 M
🌟 NEP 2020 Competency-Based Case Study (CBQ)
Seasonal Sugarcane Migrants & The Right to Education Act
Case Scenario: Dhanu's family packs their bullock cart after Dussehra to work in distant sugarcane cutting fields for six months. Dhanu cannot attend school, and his maternal uncle (Mami) worries that without an education, Dhanu will remain trapped as a landless labourer forever.
Analytical Task: How does seasonal migration violate children's fundamental Right to Education under the RTE Act, and what innovative institutional measures (like residential seasonal hostels or mobile schools) must state governments provide?
Violation of the Right to Education:
The Right to Education (RTE) Act guarantees free, compulsory, continuous education to every child aged 6 to 14. Seasonal migration pulls children out of school for half of every academic year, breaking conceptual learning continuity, causing massive learning gaps, and inevitably leading to high dropout rates and illegal child labour.
Innovative Government Solutions:
1. Seasonal Residential Hostels (Netaji Subhash Chandra Bose Hostels): Established in home villages so children can stay, receive free nutritious meals, and attend their regular school while parents migrate for work.
2. Mobile Tent Schools & Language Tutors: Government teachers deployed to temporary sugar factory camps with portable classroom kits.
3. Bridge Courses & Digital Tracking: Unique student identification cards allowing children to seamlessly attend classes at migration destinations without losing academic grade status.
CBSE Assessment Rubric: 2.5 Marks for RTE constitutional right and learning disruption analysis + 2.5 Marks for seasonal hostels, mobile schools, and student tracking = 5 Marks