Question

Question no. 3
To protect the food plants ....

Answer 1

The insecticide that has been mentioned in the question is DDT, a non-biodegradable substance which accumulates in the body of consumers or human beings through food chain. ... These kind of insecticides/pesticides are sprayed to protect the plant from insects and pests.

Answer 2

This is known as biological magnification. The increase in nom of hamful ingridients in each increasing tropic level. When the farmer put pestiside some ammount of it is taken by the roots and thisnis how it enter in plants now from plants it enter in the animal who will consume it and hence the cncntrtn will increase as the nom of consumer incrs