Ncert Exercises & Solutions

A farmer was using pesticides on his farm. He used the produce of his farm as food for rearing fishes. He was told that fishes were not fit for human consumption because large amount of pesticides had accumulated in the tissues of fishes. Explain how did this happen?

Pesticides from soil are transferred into the crops and from the crops these are transferred into rearing fish food. Pesticides entered into water through rearing fish food and finally entered into the bodies of the fishes.

Therefore, pesticides are transferred from lower trophich level to higher tropic level through food chain. Over the time, the concentration of pesticides in fishes reach a level which causes serious metabolic and physiological disorders.

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