Q. 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 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:
A) Both A and R are true and R is the correct explanation of A
B) Both A and R are true but R is not the correct explanation of A
C) A is true but R is false
D) A is false but R is true
Explanation
[Solution by Claude - not from source] Both are true. Vertebrates have a notochord in the embryo (so they are chordates), and it is replaced by a vertebral column in adults, which distinguishes them from other chordates such as urochordates and cephalochordates. Answer (1). (Some keys may choose (2); verify.)
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.