Which one of the following statements is totally wrong about the occurrence of notochord, while the other three are correct?
Held on 30 Apr 2011 · Verified 9 Jul 2026.
It is present only in larval tail in Ascidians
It is replaced by a vertebral column in adult frog
It is absent throughout life in humans from the very beginning
It is present throughout life in Amphioxus
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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 cartilaginous or bony vertebral column in adults. In the light of the above statements, choose the correct answer from the options given below:
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Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Members of subphylum vertebrata 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.
Work through every NEET UG Animal Kingdom PYQ, year by year.