Assertion :During succession, nutrient availability decreases while biomass level increases. Reason: NCP decreases during succession.

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 D Both Assertion and Reason are incorrect
During succession, both nutrient availability and biomass level increases as more and more communities develop in the given area. Hence, the assertion is incorrect.
Net community productivity or NCP is the amount of organic matter which is trapped in a particular trophic level at a given time. During succession, NCP increases as more and more communities are formed and hence, more organic matter is trapped in the trophic levels. Hence, the reason is also incorrect.
So, the correct answer is 'Both Assertion and Reason are incorrect'.

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