Assertion :Heteronomous segmentation, i.e., the division of labor resulting in dissimilarity of the metamers of the different regions of the body, is found in the phyla Annelida, Arthropoda and Chordata. Reason: None of these have true coelom.

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.
Metamerism can be defined as a linear series of segments of the body which are fundamentally similar in structure but some of them perform special functions hence, they might not be alike in any single life form. Heteronomous segmentation, i.e., the division of labour resulting in dissimilarity of the metameres of the different regions the body is found in the phyla Annelida, Arthropoda and Chordata.
Phylum Annelida, Arthropoda and Chordata all have a true coelom. Hence, the reason is incorrect. Thus, the option C is correct.

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