NEETBotanyAnimal Kingdom
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 which is replaced by a cartilaginous or bony vertebral column in the adult. In the light of the above statements, choose the most appr
Options
- ABoth (A) and (R) are true and (R) is the correct explanation of (A)
- BBoth (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
Correct answer
A. Both (A) and (R) are true and (R) is the correct explanation of (A)
Step-by-step solution
According to NCERT, all members of the phylum Chordata possess a notochord at some stage of their life. The subphylum Vertebrata is a part of Chordata, so all vertebrates are chordates. However, in vertebrates, the notochord is present only during the embryonic period and is later replaced by a cartilaginous or bony vertebral column in the adult. Other chordates (like Urochordates and Cephalochordates, collectively called protochordates) never develop a vertebral column. Therefore, all chordates are not vertebrates