Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): All vertebrates are chordates but all chordates are not vertebrates.
Reason (R) : Notochord is replaced by vertebral column in the adult vertebrates.
In the light of the above statements, choose the most appropriate answer from the options given below:

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(A) is correct but (R) is not correct

Both (A) and (R) are correct and (R) is the correct explanation of (A)

(A) is not correct but (R) is correct

Both (A) and (R) are correct but (R) is not the correct explanation of (A)

answer is D.

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Detailed Solution

All vertebrates are chordates because they possess a notochord at least at some time during their life.

All chordates are not vertebrates because protochordates have notochord but lack a vertebral column.

Therefore, A and R are true and R is the correct explanation of A.

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