Assertion :In Obelia, the polypoid and medusoid bodies are fundamentally homologous. Reason: Both phases show alternation of generation.

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
Polyp and medusae are the two body types of cnidarians. The polyps are normally fixed and are representative of asexual stage and medusae are free floating umbrella shaped which represents the sexual form. Thus, they are homologous in nature. Both of them show alteration in a generation. But, it is not the correct explanation for the assertion.
So, the correct option is B.

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Reason (R) We cannot determine order from balanced chemical equation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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