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Motion
List three measures for prevention of soil erosion.
Measures that can be adopted for the prevention of soil erosion are:
(i) Intensive cropping, and use of proper drainage canals in the fields.
(ii) Terrace farming to retard the speed of flowing water in hilly or sloping areas.
(iii) Trees should be planted. Grasses should also on lands with no vegetation cover.
(iv) Indiscriminate cutting down of forest should be avoided.
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How are living organisms dependent on the soil? Are organisms that live in water totally independent of soil as a resource?
You have seen weather reports on television and in newspapers. How do you think we are able to predict the weather?
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?
Write a note on how forests influence the quality of our air, soil and water resources.
What are the two things which are essential for all forms of life on the earth?
What is biosphere?
What are the physical components?
What is biotic component?
Does there exist any relationship between the climate and biotic components? If yes, explain with example.
What percentage of oxygen and nitrogen is present in the air?
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