Biomagnification refers to

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Increase in concentration of the toxicant from lower to higher trophic level in a food chain

Increase in concentration of the toxicant from higher to lower trophic level in a food chain

Increase in the biomass from higher to lower trophic level in an ecological pyramid

Increase in trophic efficiency from lower to higher trophic levels in an ecosystem

answer is A.

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Detailed Solution

Biomagnification refers to an increase in the concentration of the toxicant at successive trophic levels. This happens because a toxic substance accumulated by an organism cannot be metabolized or excreted and is thus passed on to the next higher trophic level. In aquatic food chains, the maximum concentration of DDT is found in birds (apex predators) due to biomagnification.

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