Give scientific reasons for the following statements :
It is necessary to prevent the uncontrolled use of pesticides and other chemicals

Explanation

Presticides and other chemical are used in order to protect the crops from diseases or pests.
Such chemicals are non-biodegrable. The amount of these chemicals increases in the soil or water bodies duet to uncontrolled use of it. From soil or water they enter in the body of plants and then it passes in trophic levels of food chain. They get accumulated progessively at each trphic level as these chemicals are not degradable. Due to biomagnification, high concentation of such chemical causes lethal effects on higher level carnivores animals. Some such chemicals prove lethal for organisms of lower trophic level too. Thise chemical reach upto human beings too through food.
Thus, it is necessary to prevent the uncontrolled use of persticides and other chemicals.