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…

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 :

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

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

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

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

Doubtly Asked 30 Oct 2026 NEET UG 2022 Practice test neet Save WhatsApp Report

1 answer

Best answer

Answer: 2. Both (A) and (R) are correct and (R) is the correct explanation of (A)

Key idea: Chordates have a notochord. In vertebrates it is replaced by the vertebral column.

(A) is correct: all vertebrates are chordates, but chordates also include non-vertebrates such as Urochordata and Cephalochordata.
(R) is correct: in adult vertebrates the notochord is replaced by the vertebral column.
(R) explains (A), because this replacement is exactly what separates vertebrates from the other chordates.

Answer: option 2.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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