Assertion :Cephalization is first observed in Phylum Platyhelminthes. Reason: Cephalization developed along with evolution of bilateral symmetry.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Cephalization is an evolutionary trend in which, over many generations, the mouth, sense organs, and nerve ganglia become concentrated at the front end of an animal, producing a head region. This is associated with movement and bilateral symmetry, such that the animal has a definite head end. Flatworms of the Platyhelminthes phylum show the beginnings of cephalization but are not fully cephalized.

So, the correct option is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'.

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