Chapter 11 of 22
Chapter 11: Sunita in Space
Space Travel, Zero Gravity, Earth from Space, Neil Armstrong & Moon Phases | CBSE Session 2026–27
Core Pedagogical Competencies & Concepts
- 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.
All Textbook Exercises & In-Text Tasks (22 Questions)
100% Complete Ingestion
Q1
Textbook Exercise
Describe what living in a zero-gravity spacecraft is like based on Sunita Williams' experiences.
[4 Marks]
✅ Step-by-Step Solution & Working
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
Textbook Exercise
Why did Sunita Williams say: 'Division of countries is only on paper, Earth has no lines drawn on it'?
[3 Marks]
✅ Step-by-Step Solution & Working
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
Textbook Exercise
What is gravity? Give three daily life examples showing the effect of Earth's gravitational force on our planet.
[3 Marks]
✅ Step-by-Step Solution & Working
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
Textbook Exercise
Who was Neil Armstrong? On what date did he achieve the historic milestone of landing on the Moon?
[3 Marks]
✅ Step-by-Step Solution & Working
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
Textbook Exercise
Why does the shape of the Moon appear to change every night in the sky? What is the difference between Purnima and Amavasya?
[4 Marks]
✅ Step-by-Step Solution & Working
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
Think and Discuss • Environmental Science & Ecology • Sunita in Space
[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.
[3 Marks]
✅ Step-by-Step Solution & Working
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
Find Out and Write • Observational Field Study • Sunita in Space
[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.
[3 Marks]
✅ Step-by-Step Solution & Working
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
Scientific Investigation • Ecosystem Relationships • Sunita in Space
[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.
[3 Marks]
✅ Step-by-Step Solution & Working
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
Traditional Wisdom & Community Stewardship • Conservation • Sunita in Space
[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.
[3 Marks]
✅ Step-by-Step Solution & Working
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
Survey & Data Collection • Experiential Inquiry • Sunita in Space
[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.
[3 Marks]
✅ Step-by-Step Solution & Working
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
Health, Diet & Human Biology • Nutritional Science • Sunita in Space
[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.
[3 Marks]
✅ Step-by-Step Solution & Working
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
Disaster Preparedness & Climate Resilience • Geography • Sunita in Space
[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.
[3 Marks]
✅ Step-by-Step Solution & Working
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
Biodiversity & Habitat Adaptations • Wildlife Protection • Sunita in Space
[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.
[3 Marks]
✅ Step-by-Step Solution & Working
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
Think and Discuss • Environmental Science & Ecology • Sunita in Space
[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.
[3 Marks]
✅ Step-by-Step Solution & Working
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
Find Out and Write • Observational Field Study • Sunita in Space
[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.
[3 Marks]
✅ Step-by-Step Solution & Working
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
Scientific Investigation • Ecosystem Relationships • Sunita in Space
[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.
[3 Marks]
✅ Step-by-Step Solution & Working
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
Traditional Wisdom & Community Stewardship • Conservation • Sunita in Space
[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.
[3 Marks]
✅ Step-by-Step Solution & Working
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
Survey & Data Collection • Experiential Inquiry • Sunita in Space
[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.
[3 Marks]
✅ Step-by-Step Solution & Working
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
Health, Diet & Human Biology • Nutritional Science • Sunita in Space
[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.
[3 Marks]
✅ Step-by-Step Solution & Working
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
Disaster Preparedness & Climate Resilience • Geography • Sunita in Space
[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.
[3 Marks]
✅ Step-by-Step Solution & Working
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
Biodiversity & Habitat Adaptations • Wildlife Protection • Sunita in Space
[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.
[3 Marks]
✅ Step-by-Step Solution & Working
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
Think and Discuss • Environmental Science & Ecology • Sunita in Space
[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.
[3 Marks]
✅ Step-by-Step Solution & Working
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
Life Aboard the International Space Station (ISS)
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.
Evaluation & Model Answer:
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.
Rubric: 2.5 Marks for surface tension and weightlessness explanation + 2.5 Marks for treadmill and resistance exercise methods = 5 Marks