Question

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

• 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 but R is NOT the correct explanation of A.

Answer 1

The Correct Option is A

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.