The term 'bio-magnification' refers to the

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(B) Bio-magnification refers to the increase in the concentration of non-degradable pollutants (such as $DDT$ or mercury) at successive trophic levels

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Increase in the concentration of non-degradable pollutants as they pass through the food chains

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(B) Bio-magnification refers to the increase in the concentration of non-degradable pollutants (such as $DDT$ or mercury) at successive trophic levels in a food chain.This occurs 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 a higher concentration.

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