Assertion :In a terrestrial ecosystem, detritus food chain is a major conduit for energy flow. Reason: Solar energy is direct source of energy supply in detritus food chain.

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
In a terrestrial ecosystem, detritus food chains (DFC) a major conduit of energy flow. As an organism does or produces biological matter or waste, it enters DFC. Further steps include recycling of nutrient and flow of energy in DFC.
However, the source of energy in DFC is dead organic matter.
So, the correct answer is option C, assertion is correct but reason is incorrect.

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