Assertion :Arthropods possess only true coelom. Reason: Haemocoel in arthropods is not lined by the mesodermal epithelium.

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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Assertion is incorrect but Reason is correct.

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Solution

The correct option is C Assertion is correct but Reason is incorrect.
In contrast to annelids, the arthropods have a much reduced coelomic cavity. The space between the gut and body wall is mostly occupied by muscles and organs with blood containing interspaces. These spaces together forms the haemocoel, which is not a true coelom. The coelom is lined by mesodermal epithelium. However, greatly reduced true coelom exists in the form of a number of separate spaces, such as enclosing the excretory and genital organs. Therefore, assertion is correct but reason is incorrect.
Thus, the correct answer is option C.

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