Question

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 the vertebral column in the adult vertebrates.
In the light of the above statements, choose the most appropriate answer from the options given below:

• A. Both (A) and (R) are correct and (R) is the correct explanation of (A)
• B. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
• C. (A) is correct but (R) is not correct
• D. (A) is not correct but (R) is correct

Answer 1

Answer: (A)

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

Answer 2

The correct answer is (a).
All vertebrates are chordates but all chordates are not vertebrates. This statement is true because all the features of chordates are present in all the vertebrates. In adult vertebrates, the notochord is replaced by the vertebral column and this is not the case for all chordates, hence the assertion is correct and reason is the correct explanation of assertion.