Question:medium
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Members of subphylum vertebrates possess notochord during the embryonic period. The notochord is replaced by a cartilaginous or bony vertebral column in the adult.
Reason R: Thus all chordates are vertebrates not all vertebrates are chordates.
In the light of the above statements choose the correct answer from the option given below
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Members of subphylum vertebrates possess notochord during the embryonic period. The notochord is replaced by a cartilaginous or bony vertebral column in the adult.
Reason R: Thus all chordates are vertebrates not all vertebrates are chordates.
In the light of the above statements choose the correct answer from the option given below
Assertion A: Members of subphylum vertebrates possess notochord during the embryonic period. The notochord is replaced by a cartilaginous or bony vertebral column in the adult.
Reason R: Thus all chordates are vertebrates not all vertebrates are chordates.
In the light of the above statements choose the correct answer from the option given below
Updated On: Nov 26, 2025
- 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.
- Both A and R are true but R is NOT the correct explanation of A.
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The Correct Option is A
Solution and Explanation
Statement A is valid. Vertebrates exhibit a notochord in their embryonic stage, which is subsequently substituted by a vertebral column.
Statement R is invalid. While all vertebrates are chordates, the converse is not true; some chordates are not vertebrates (e.g., tunicates, cephalochordates). A key characteristic of chordates is the presence of a notochord at some point during development. Statement R misrepresents the connection between chordates and vertebrates.
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