NEET 2025 · BiologyVertebrataPrevious Year Question
Given below are two statements: one is labelled as Assertion (A) and the other labelled as Reason (R). Assertion (A): All vertebrates are chordates but all chordates are not vertebrate. Reason (R): The members of subphylum vertebrata possess notochord during the embryonic period, the notochord is replaced by a cartilaginous or bony vertebral column in adults. In the light of the above statements, choose the correct answer from the options given below:
Answer: (C) Both A and R are true and R is the correct explanation of A. Both statements are true.
- A.A is true but R is false
- B.A is false but R is true
- C.Both A and R are true and R is the correct explanation of A✓
- D.Both A and R are true and R is not the correct explanation of A
Correct Answer
(C) Both A and R are true and R is the correct explanation of A
Solution & Explanation
Both statements are true. Vertebrates possess a notochord in the embryo which is later replaced by a cartilaginous or bony vertebral column, while protochordates (Urochordata, Cephalochordata) retain the notochord and lack a vertebral column. This defining vertebrate feature correctly explains why all vertebrates are chordates but not all chordates are vertebrates, so R is the correct explanation of A (option c). NCERT Reference: Page 46, line 30
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