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): The members of subphylum Vertebrata possess a notochord during the embryonic period; the notochord is replaced by a cartilaginous or bony vertebral column in adults.
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): The members of subphylum Vertebrata possess a notochord during the embryonic period; the notochord is replaced by a cartilaginous or bony vertebral column in adults.
Assertion (A): All vertebrates are chordates but all chordates are not vertebrates.
Reason (R): The members of subphylum Vertebrata possess a notochord during the embryonic period; the notochord is replaced by a cartilaginous or bony vertebral column in adults.
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Vertebrates have backbones (vertebral column). Some chordates don't.
Updated On: Jan 13, 2026
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
- Both A and R are true and R is the correct explanation of A.
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The Correct Option is A
Solution and Explanation
The assertion is true. Vertebrates are a subphylum within the phylum Chordata. However, other chordate subphyla (Urochordata and Cephalochordata) are not vertebrates. The reason is also true – vertebrates develop a vertebral column that replaces the notochord. However, the reason doesn't fully explain why all chordates aren't vertebrates. The key difference lies in the development of a vertebral column, which is unique to vertebrates. Other chordates retain the notochord throughout their lives.
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