Chapter 11: Nature’s Treasures Worksheet

Bhupendra Rawat -

 

Chapter 11: Nature’s Treasures

Worksheet 

A. Multiple Choice Questions 

1. Which of the following is a natural resource?
(a) Plastic
(b) Machine
(c) Water
(d) Computer

Answer: (c) Water

2. Which gas is present in the largest amount in air?
(a) Oxygen
(b) Nitrogen
(c) Carbon dioxide
(d) Argon

Answer: (b) Nitrogen

3. Approximately what percentage of air is oxygen?
(a) 78%
(b) 50%
(c) 21%
(d) 1%

Answer: (c) 21%

4. Moving air is called:
(a) Wind
(b) Cloud
(c) Vapour
(d) Breeze

Answer: (a) Wind

5. Which of the following is a source of freshwater?
(a) Sea
(b) Ocean
(c) River
(d) Saltwater lake

Answer: (c) River

6. Which device uses sunlight to produce electricity?
(a) Windmill
(b) Solar panel
(c) Water pump
(d) Bicycle

Answer: (b) Solar panel

7. Forests are important because they:
(a) Reduce biodiversity
(b) Provide habitat to many organisms
(c) Produce machines
(d) Increase pollution

Answer: (b) Provide habitat to many organisms

8. Soil is formed mainly through the:
(a) Melting of plastic
(b) Weathering and disintegration of rocks
(c) Burning of coal
(d) Formation of clouds

Answer: (b) Weathering and disintegration of rocks

9. Which organism helps in improving soil by making it loose?
(a) Earthworm
(b) Fish
(c) Butterfly
(d) Eagle

Answer: (a) Earthworm

10. Which of the following is a fossil fuel?
(a) Sunlight
(b) Wind
(c) Coal
(d) Forest

Answer: (c) Coal

11. Which one is a renewable resource?
(a) Coal
(b) Petroleum
(c) Natural gas
(d) Wind

Answer: (d) Wind

12. Which of these is a non-renewable resource?
(a) Sunlight
(b) Wind
(c) Petroleum
(d) Water

Answer: (c) Petroleum

13. Which movement is associated with the protection of trees?
(a) Chipko Movement
(b) Green Revolution
(c) Quit India Movement
(d) Swachh Bharat Movement

Answer: (a) Chipko Movement

14. Which of the following is a human-made resource?
(a) Forest
(b) Soil
(c) Machine
(d) Water

Answer: (c) Machine

15. Which practice helps in conserving water?
(a) Keeping taps running
(b) Repairing leaking taps
(c) Polluting rivers
(d) Wasting water while washing

Answer: (b) Repairing leaking taps

B. Fill in the Blanks 

1. About ________% of air is nitrogen.
Answer: 78%

2. About ________% of air is oxygen.
Answer: 21%

3. Moving air is called ________.
Answer: wind

4. The main source of energy for Earth is the ________.
Answer: Sun

5. Plants use sunlight to prepare food through ________.
Answer: photosynthesis

6. Coal, petroleum and natural gas are called ________ fuels.
Answer: fossil

7. ________ is a renewable natural resource.
Answer: Wind

8. ________ helps to hold soil together and prevents soil erosion.
Answer: Roots of plants

9. Rocks contain useful substances called ________.
Answer: minerals

10. Collecting and storing rainwater for later use is called ________.
Answer: rainwater harvesting

C. True or False

1. Air is a natural resource.
Answer: True

2. Nitrogen forms about 21% of air.
Answer: False

3. Oxygen is essential for respiration.
Answer: True

4. Petroleum is a renewable resource.
Answer: False

5. Forests provide shelter and food to many organisms.
Answer: True

6. Soil can be formed instantly.
Answer: False

7. Sunlight is a renewable source of energy.
Answer: True

8. Machines are natural resources.
Answer: False

9. Large-scale cutting of trees can lead to soil erosion.
Answer: True

10. Conservation means careful and sensible use of resources.
Answer: True

D. Match the Following

Column AColumn B
1. Wind(a) Fossil fuel
2. Coal(b) Renewable resource
3. Solar panel(c) Produces electricity from sunlight
4. Earthworm(d) Helps improve soil
5. Petroleum(e) Non-renewable resource

Answers:
1 – (b)
2 – (a)
3 – (c)
4 – (d)
5 – (e)

E. Very Short Answer Questions

1. What are natural resources?

Answer: Natural resources are materials and substances obtained from nature that are useful to humans and other living organisms.

2. Name two gases present in air.

Answer: Nitrogen and oxygen.

3. What is wind?

Answer: Moving air is called wind.

4. Name two fossil fuels.

Answer: Coal and petroleum.

5. What is rainwater harvesting?

Answer: Rainwater harvesting is the collection and storage of rainwater for later use.

6. Name two renewable resources.

Answer: Sunlight and wind.

7. Name two non-renewable resources.

Answer: Coal and petroleum.

8. Why are forests important?

Answer: Forests provide food and shelter to many organisms and support biodiversity.

9. What is a mineral?

Answer: A mineral is a useful substance found naturally in rocks.

10. Name one movement related to forest conservation.

Answer: The Chipko Movement.

F. Short Answer Questions

1. Why is air important for living organisms?

Answer: Air is essential for life. Oxygen present in air is needed for respiration. Air also supports other natural processes and moving air, or wind, can be used for activities such as generating electricity.

2. Why should we conserve water?

Answer: Water is essential for drinking, cooking, cleaning, farming and other activities. Freshwater is limited, so we should avoid wastage, prevent pollution and use water carefully.

3. Write two uses of sunlight.

Answer:

  1. Plants use sunlight to prepare food through photosynthesis.

  2. Sunlight can be used to generate electricity and heat using solar devices.

4. How do forests help the environment?

Answer: Forests provide habitat and food for many organisms. They support biodiversity and their trees help protect soil and maintain the natural environment.

5. Why is soil important?

Answer: Soil supports plant growth and provides a place for many organisms to live. It also contains nutrients needed by plants.

6. Why are fossil fuels called non-renewable resources?

Answer: Fossil fuels take millions of years to form and cannot be replaced quickly after being used. Therefore, their supply is limited.

7. Differentiate between renewable and non-renewable resources.

Answer:
Renewable resources can be naturally replenished, such as sunlight and wind.
Non-renewable resources are limited and take a very long time to form, such as coal and petroleum.

8. How can we conserve forests?

Answer: We can conserve forests by planting trees, protecting existing forests, preventing unnecessary cutting of trees and encouraging people to participate in tree plantation and conservation activities.

9. How does cutting trees affect soil?

Answer: Tree roots hold soil together. When trees are removed, the soil becomes more vulnerable to erosion. The reduction of fallen leaves also reduces the addition of organic matter to the soil.

10. What is the importance of conservation of natural resources?

Answer: Conservation ensures that natural resources are used carefully and remain available for future generations. It also helps protect the environment and biodiversity.

G. Long Answer Questions

1. Explain the different types of natural resources with examples.

Answer:
Natural resources are resources obtained from nature. Important natural resources include:

  • Air: Essential for living organisms and contains gases such as nitrogen and oxygen.

  • Water: Needed for drinking, farming, cooking, cleaning and many other activities.

  • Sunlight: Provides energy and helps plants prepare food.

  • Forests: Provide food, shelter and support biodiversity.

  • Soil: Supports plant growth and contains nutrients.

  • Rocks and minerals: Used for construction and obtaining useful materials.

  • Fossil fuels: Coal, petroleum and natural gas are used as sources of energy.

2. Explain why water is an important natural resource. How can we conserve it?

Answer:
Water is essential for all living organisms. Humans use water for drinking, cooking, bathing, cleaning, farming and many other activities.

We can conserve water by:

  1. Avoiding unnecessary wastage.

  2. Closing taps when water is not needed.

  3. Repairing leaking taps and pipes.

  4. Reusing water wherever suitable.

  5. Preventing pollution of water sources.

  6. Collecting rainwater through rainwater harvesting.

3. Explain the importance of forests and the need for their conservation.

Answer:
Forests are important natural resources. They provide food and shelter to many organisms and support biodiversity. Trees also help protect soil.

Large-scale cutting of trees can damage forest ecosystems and increase soil erosion. Therefore, forests should be conserved by protecting existing trees, planting new trees and avoiding unnecessary cutting. Activities such as the Chipko Movement show the importance of protecting trees.

4. Explain renewable and non-renewable resources with examples.

Answer:

Renewable Resources

These resources can be replenished naturally. Examples include:

  • Sunlight

  • Wind

  • Water

  • Forests, when properly managed

Non-renewable Resources

These resources are limited and take a very long time to form. Examples include:

  • Coal

  • Petroleum

  • Natural gas

  • Minerals

We should use both types of resources carefully, especially non-renewable resources.

5. What are fossil fuels? Why should their use be reduced?

Answer:
Coal, petroleum and natural gas are called fossil fuels. They were formed from the remains of living organisms over millions of years.

They are non-renewable because they take a very long time to form and cannot be replaced quickly. Their burning can also cause pollution. Therefore, we should use fossil fuels carefully and increase the use of cleaner renewable sources such as sunlight and wind.

6. Explain how human activities can affect natural resources.

Answer:
Human activities can affect natural resources in many ways. Excessive cutting of trees reduces forest cover and may cause soil erosion. Wasting and polluting water reduces the availability of clean water. Excessive use of fossil fuels uses up limited resources and contributes to pollution.

Therefore, we should use resources responsibly, reduce wastage, prevent pollution, plant and protect trees, and use renewable sources of energy wherever possible.

7. Prepare a plan for saving natural resources in your school.

Answer:
A school can conserve natural resources through the following measures:

  1. Repair leaking taps and pipes.

  2. Turn off taps after use.

  3. Avoid unnecessary use of electricity.

  4. Encourage students to save water and energy.

  5. Plant and protect trees around the school.

  6. Keep the school surroundings clean.

  7. Use water carefully for cleaning and gardening.

  8. Collect rainwater wherever possible.

  9. Reuse suitable water for gardening or cleaning.

  10. Conduct awareness activities about conservation.

Such steps help reduce wastage and teach students to use natural resources responsibly.




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