Write notes: Biomagnification

Explanation

Biomagnifaction is defind as the increase in concentration of toxicants at successive trophic levels of a food chain. Mercury and DDT are well known for biological magnification . Toxic materials cannot be metabolised or excreted. Therefore, they get accumulated in an organism and pass on to higher trophic levels, e.g., DDT accumulates in birds at higher trophic levels and disturbs calcium metabolism in them which resulting in thinning of egg shell and breaking prematurely. This results in decline of bird population.