Question

why are pesticides and other chemical substance accumulated in large quantities in human beings

Answer 1

Harmful pesticides like ddt are sprinkled on crop plants to protect them from pests and disease . These chemicals are either washed down into soil or into waterbodies. From the soil they are absorbed by plants and from waterbodies these are taken by aquatic plants and anoimals . These toxins enter our food chain. They get accumulated in the organisms body in each trophic level. The maximum gets accumulated in the human body because they occupy The topmost place in food chain