Answer:
(a) The removal and transportation of the top layer of soil from its
original position to another place, under the effect of strong winds and fast
running rain water is called soil erosion.
It can be prevented by planting trees and sowing grasses.
Proper drainage canals around the fields can prevent soil
erosion.
(b) Nucleic acid and proteins.
(c) Water is essential for life due to following reasons
(i) All cellular processes take place in water medium.
(ii) Reactions take place in our body and within the
cells, occur between substances that are dissolved in water.
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