Assertion :Presence of large amounts of nutrients in water body causes excessive growth of planktonic algae. Reason: It is due to biomagnification.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is C Assertion is correct but Reason is incorrect.
There may be excess of nutrients which enter the water bodies due to the flow of nutrients from the fertilizers. In the presence of nutrients, the algae grow in large amounts. Biomagnification is the process in which the concentration of a toxic molecule increases in the food chain and then cause the death of the aquatic organisms by entering the lakes and rivers.
So, the correct answer is option C.

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