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(C) The increase in the concentration of toxic substances at successive trophic levels is known as biomagnification.This occurs because a toxic substa

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biomagnification

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(C) The increase in the concentration of toxic substances at successive trophic levels is known as biomagnification.This occurs because a toxic substance accumulated by an organism cannot be metabolized or excreted,and thus is passed on to the next higher trophic level.For example,$DDT$ is a persistent pesticide that accumulates in the fatty tissues of organisms.As it moves up the food chain,its concentration increases significantly per unit weight of the organism.For instance,the concentration of $DDT$ in water is $0.003 \ ppb$,which increases to $0.003 \ ppm$ in phytoplankton,$0.04 \ ppm$ in zooplankton,$0.5 \ ppm$ in small fish,$2.0 \ ppm$ in large fish,and reaches $25 \ ppm$ in fish-eating birds.

Increase in concentration of the toxicant at successive trophic levels is known as

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