Class 6 Science Chapter 11 Extra Questions and Answers – Nature’s Treasures
Class 6 Science Chapter 11 Extra Questions and Answers for “Nature’s Treasures” (based on NCERT textbook Curiosity).
EXTRA IMPORTANT QUESTIONS WITH ANSWERS – Chapter 11 – Nature’s Treasures
This includes All types of Questions normally asked in school exams, tests, and NCERT exercises.
VERY SHORT ANSWER QUESTIONS (with answers)
Q1. What gas is the major component of air?
Answer: Nitrogen (78%)
Q2. Which gas in air supports burning?
Answer: Oxygen
Q3. What is moving air called?
Answer: Wind
Q4. Name the main source of energy on Earth.
Answer: The Sun
Q5. What is the term for salty water found in seas and oceans?
Answer: Saline water
Q6. Give one example of a renewable resource.
Answer: Water
Q7. Give one example of a non-renewable resource.
Answer: Coal
Q8. What is the process of collecting rainwater called?
Answer: Rainwater harvesting
Q9. What do plants release into the soil when their leaves decay?
Answer: Nutrients
Q10. Which fuel is commonly used in scooters and motorbikes?
Answer: Petrol
SHORT ANSWER QUESTIONS (with answers)
Q11. Why is oxygen important for living beings?
Answer: Oxygen is required for breathing and for carrying out various life processes in the body. Without oxygen, living beings cannot survive.
Q12. Why is wind important?
Answer: Wind helps rotate windmills, supports pollination, dries clothes, and aids in dispersal of seeds.
Q13. Why do we say freshwater is limited?
Answer: Most water on Earth is salty; only a small amount of freshwater is available in rivers, lakes, ponds, and underground sources.
Q14. Why should we not waste water?
Answer: Freshwater resources are limited, many people do not have enough water, and conserving water ensures sustainability for future generations.
Q15. Why do clothes dry faster in sunlight?
Answer: Heat from the Sun increases evaporation, causing water in the clothes to evaporate faster.
Q16. How does air pollution occur?
Answer: Air pollution occurs due to burning fossil fuels, factory emissions, vehicle smoke, and burning garbage.
Q17. What is the importance of forests?
Answer: Forests provide food, oxygen, shelter, herbs, wood, and maintain ecological balance.
Q18. What are minerals?
Answer: Minerals are naturally occurring substances found in rocks; metals like iron, copper, and gold are obtained from them.
LONG ANSWER QUESTIONS (with answers)
Q19. Describe how soil is formed.
Answer:
Soil is formed by the breakdown of rocks over thousands of years due to heat from the Sun, flowing water, and the action of living organisms. Plant roots, animals, and microorganisms also help break down rocks. The resulting particles mix with organic matter to form soil.
Q20. Explain the importance of conserving forests.
Answer:
Forests prevent soil erosion, provide oxygen, support wildlife, maintain rainfall patterns, provide raw materials like wood and fruits, and maintain ecological balance. Cutting forests leads to loss of biodiversity, climate change, and reduced soil fertility.
Q21. Explain the difference between renewable and non-renewable resources with examples.
Answer:
Renewable resources can be replenished naturally within a short time, such as air, water, and forests. Non-renewable resources take millions of years to form and are available in limited quantities, such as coal, petroleum, and minerals.
Q22. Why is the Sun considered the ultimate source of energy?
Answer:
The Sun provides energy for plants to prepare food. Herbivores get energy by eating plants and carnivores get energy by eating animals. Most natural processes depend on sunlight, including the water cycle, photosynthesis, and temperature regulation.
HIGHER ORDER THINKING (HOTS) QUESTIONS (with answers)
Q23. If all forests were cut down, what major changes would occur in the environment?
Answer:
There would be soil erosion, loss of wildlife, irregular rainfall, increase in temperature, air pollution increase due to lack of oxygen production, and disruption of the ecological balance.
Q24. Why does water become polluted when plastic is thrown into rivers?
Answer:
Plastic releases harmful chemicals, blocks sunlight, prevents oxygen movement in water, kills aquatic life, and does not decompose, making rivers toxic.
Q25. Why is it harmful to depend only on fossil fuels?
Answer:
Fossil fuels cause air pollution, global warming, health issues, and are limited in quantity; if overused, they will run out.
APPLICATION-BASED QUESTIONS (with answers)
Q26. Riya observes her tap leaking continuously. What should she do?
Answer:
She should ask an adult or plumber to fix the leakage and ensure that water is not wasted.
Q27. Why are solar cookers more useful in areas with a lot of sunlight?
Answer:
Because they rely on sunlight to generate heat, and areas with strong sunlight provide better heating for cooking food.
Q28. Why do plants grow well in forest soil?
Answer:
Forest soil contains humus from decayed leaves, which enriches the soil with nutrients needed for plant growth.
REASONING / DIAGRAM-BASED QUESTIONS (with answers)
Q29. A firki rotates when you run while holding it. Why?
Answer:
The moving air pushes the blades of the firki, causing it to rotate. This demonstrates how windmills work.
Q30. In Fig. 11.4b, stepwells have stone-lined walls. Why is this helpful?
Answer:
Stone walls allow slow seepage of water, helping collect both rainwater and groundwater efficiently.
DIFFERENTIATION QUESTIONS (with answers)
Q31. Differentiate between air and wind.
Answer:
Air: Invisible mixture of gases around Earth.
Wind: Moving air.
Q32. Differentiate between renewable and non-renewable resources.
Answer:
Renewable: Replenished naturally (air, water).
Non-renewable: Limited, cannot be replaced quickly (coal, petroleum).
ACTIVITY-BASED QUESTIONS (with answers)
Q33. What did you learn from Activity 11.1 (breathing exercise)?
Answer:
Our body needs oxygen continuously; holding breath for long causes discomfort because oxygen supply stops.
Q34. What is the conclusion from Activity 11.3 (water wastage table)?
Answer:
Water is widely wasted; we must reduce wastage by turning off taps, recycling water, and preventing leaks.
Q35. What do we learn from Activity 11.4 (soil investigation)?
Answer:
Different soils have different textures, colors, and materials; soil contains living and non-living components.
VALUE-BASED QUESTIONS (with answers)
Q36. Why should we not pluck fruits in forests?
Answer:
They are food for animals and birds; respecting nature maintains balance in the ecosystem.
Q37. What value is shown when Bhoomi and Surya help Ajji in watering plants?
Answer:
Responsibility, care for nature, and awareness about resource conservation.
EXTRA NCERT-STYLE QUESTIONS (with answers)
Q38. Why is it important to classify natural resources?
Answer:
Classifying helps us understand which resources need conservation and which are at risk of exhaustion.
Q39. How do earthworms help maintain soil quality?
Answer:
They turn and loosen soil, increase air spaces, and help in decomposition, enriching soil fertility.
Q40. Why do vehicles cause more pollution in cities than in villages?
Answer:
Cities have more vehicles, heavy traffic, and continuous burning of fossil fuels, leading to higher pollution levels.