[" (B) (Any two) "],[" i.Why was Dr.Herriot tempted to keep Tricki on as a permanent guest? "],[" ii.Why did Richard Ebright give up tagging.butterflies? "]

Why is he tempted to keep Tricki on as a permanent guest?

The figure shows two crop fields (plots A and B) have been treated by manures and chemical fertilizers, respectively, keeping other environment factors same. Observe the graph and answer the following question: (i) Why does plot B shows 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.

(i) What is somg ? Is it a primary or secondaryy pollutant ? (ii) Why is it harmful to man ? Justify by giving two reasons.