Name the phenomenon in which non-biodegradable chemical gets accumulated at each trophic level of a food chain.

The phenomenon in which non-bodegradable chemical get accumulated at each tropic level of a food chain is called biological magnification.

Example: DDT shows biological magnification. It is an insecticide used to kill mosquitoes.

DDT gets accumulated in the successive trophic levels. Zooplankton, small nekton, larger fish etc., anyone who eats these fish also have higher level of DDT than fish.