Question

how do pesticides enter the food chain and subsequently get into the human body justify

Answer 1

A large number of pesticides and chemicals are used to protect crops from several pests and diseases. These pesticides reach the soil because of rain or sprinkling of water on crops and are absorbed by plants along with water and minerals from the soil.

Due to rain, these chemicals enter the water sources and bodies of aquatic plants and animals. This is how these chemicals enter the food chain.

Since these chemicals cannot decompose, they accumulate continuously at each trophic level. As the food chain proceeds, concentrations of the pesticides also increase. When human beings depends on the herbivores or other animals(secondary consumers) then the pesticides enter the human bodies.