Question

It is a common observation that after a plant is sprayed with a heavy dose of insecticides, yellowish areas develop on the leaves. Investigations show that the plant cells die. Since the insecticide spray is not poisonous to plants, try and give the cause of death of the cells.

Answer 1

The statement that insecticide is not poisonous in nature is false , naturally they are high poisonous in nature. when we spray it on plants ,the leaves becomes yellowish because of the over chemical power of insecticide .the plant cell will  die and then the area becomes faded.