What is biological magnification? Will the levels of this magnification be different at different levels of the ecosystem?

Explanation

(a) The harmful chemicals like pesticides enter the food chain at the producer level (plant level) and in the process of transfer of food through food chains these hermful chemicals get concentrated at each trophic level. The increase in concentration of hermful chemical substances like pesticides in the body of living organisms at each trophic level of a food chain is called biological magnification. Pesticides are non-biodegradable chemicals, so they get accumulated at each trophic level.
(b)Yes the level of biological magnification is different for different trophic levels of an ecosystem. For example , in the food chain : Plant`to`Goat`to`Men, the hermful chemicals enter into plants from soil and water. When goat eats these plants , the chemicals enter into goat's body. And ultimately when a non-vegaterian men eats the goat meat, the chemicals are trasnferred to his body. The level or concentration of the hermful chemicals increases with increasing level. In the above given food chain, the concentration of hermful chemiclas is mininum in the plants, higher in the goat and maximum in man.