Chapter 14
Natural Resources
Page-193
Questions–
1. How is our atmosphere different from the atmosphere on venus and Mars?
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2. How does the atmosphere act as a blanket?
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3. What causes winds?
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4/ How are clouds formed?
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5. List any three human activities that you think would lead to air pollution.
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Page-194
Questions-
1. Why do organisms need water?
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2. What is the major source of fresh water in the city/town/village where you live?
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3. Do you know of any activity which may be polluting this water source?
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Page-196
Questions-
1. How is soil formed?
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2. What is soil erosion?
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3. What are the methods of preventing or reducing soil erosion?
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Page-201
Questions-
1. What are the different states in which water is found during the water cycle?
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2. Name two biologically important compounds that contain both oxygen and nitrogen.
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3. List any three human activities which would lead to an increase in the carbon dioxide content of air.
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4. What is the greenhouse effect?
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5. What are the two forms of oxygen found in the atmosphere?
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Exercises–
1. Why is the atmosphere essential for life?
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2. Why is water essential for life?
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3. How are living organisms dependent on the soil? Are organisms that live in water totally independent of soil as a resource?
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4. You have seen weather reports on television and in newspapers. How do you think we are able to predict the weather?
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5. We know that many human activities lead to increasing levels of pollution of the air, water-bodies and soil. Do you think that isolating these activities to specific and limited areas would help in reducing pollution?
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6. Write a note on how forests influence the quality of our air, soil and water resources.
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