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Q.

Mark the correct statement with respect to biomagnification and energy flow.

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a

Available energy increases while the toxicant concentration decreases in the successive trophic levels of a food chain.

b

Both available energy and toxicant concentration decreases in the successive trophic levels of a food chain.

c

Both available energy and toxicant concentrations increase in the successive trophic levels of a food chain.

d

Available energy decreases while toxicant concentration increases in the successive trophic levels of a food chain.

answer is B.

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Detailed Solution

When energy flows from a particular trophic level to the next trophic level, some energy is always lost as heat at each step. Hence, the energy decreases from one trophic level to another.

Toxic substances on other hand increase in successive trophic levels as they are neither metabolised not excreted. Thus lead to biomagnification.

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