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Topic: Chordates up to classes· Diversity in Living World

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 noto…

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 :

1. Both A and R are true and R is the correct explanation of A

2. Both A and R are true but R is not the correct explanation of A

3. A is true but R is false

4. A is false but R is true

Doubtly Asked NEET UG 2025 Practice test neet Save WhatsApp Report
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Best answer

Answer: 1. Both A and R are true and R is the correct explanation of A

Key idea: All chordates have a notochord, but only vertebrates replace it with a vertebral column.

A is true: vertebrates are a subphylum of chordates; urochordates and cephalochordates are chordates without a vertebral column. R is true and explains why vertebrates form a special group within chordates: the notochord is present in the embryo and replaced by cartilaginous or bony vertebrae in the adult. Option 1.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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