Insects have a damaging effect on the crop yield. Some insects cut the plant parts inhibiting their growth while others suck the cell sap so bees cannot help in pollination. Some insects are even seen as the bore which damage the entire crop yield.
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Figure shows the two crop fields plots A and B] have been treated by manures and Chemical fertilisers respectively, keeping other environmental factors same. Observe the graph and answer the following questions. (i) Why does plot B show sudden increase and then gradual decrease in yield? (ii) Why is the highest peak in plot A graph slightly delayed? (iii) What is the reason for the different pattern of the two graphs?
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Arrange these statements in correct sequence of preparation of green manure. (a) Green plants are decomposed in soil. (b) Green plants are cultivated for preparing manure or crop plant parts are used. (c) Plants are ploughed and mixed into the soil. (d) After decomposition it becomes green manure.
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