What is biomagnification in biology?

Biomagnification is the collection of a chemical by an organism from water and food  through exposure that causes a concentration of those chemicals. The chemicals accumulated will be greater than what would normally be accumulated through water exposure alone, thus exceeding the equilibrium.

An example of biomagnification is the accumulation of insecticides in zooplanktons. These zooplanktons are consumed by fish and the fish in turn are consumed by lifeforms high in the food chain, thus spreading the toxicity in the entire food chain. 

For more relevant articles refer to the links given below:

• UPSC Environment and Ecology Questions
• Conservation of Biodiversity
• UPSC Environment and Ecology