Given below are two statements: one is labeled Assertion (A) and other is labeled Reason (R).
Assertion (A): All chordates are vertebrates.
Reason (R): Notochord is replaced by the vertebral column in vertebrates during the embryonic stage.
In the light of above statements, choose the correct answer from the options given below.

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A is true, R is false.

A and R are false.

A and R are true, R does not explain A.

A and R are true, R explains A.

answer is B.

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Detailed Solution

Assertion (A) is false. All chordates are vertebrates.

Reason (R) is false. Notochord is replaced by the vertebral column in vertebrates during the embryonic stage.

Explanation: While it is true that all vertebrates are chordates, not all chordates are vertebrates. Chordata is a phylum that includes both vertebrates and invertebrates. Additionally, in some vertebrates, like tunicates and lancelets, the notochord persists into adulthood and is not replaced by a vertebral column. Notochord is replaced by the vertebral column in adult vertebrates.

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