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Get Answers to all your Questions
Q.93)
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason ®.1
Assertion (A) : All verfebrates 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) (1) A is false but R is true
B) Both A and R are true and A is the correct explanation of R
C) Both A and R are true but A is not the correct explanation of R
D) A is true but R is false
Answers (1)
The Assertion (A) is true as all vertebrates are members of the phylum Chordata (they constitute a subphylum of chordates), but all chordates are not vertebrates. Certain chordates, such as urochordates (e.g., tunicates) and cephalochordates (e.g., Amphioxus), fail to develop a vertebral column.
The Reason (R) is also correct. In vertebrates, there is a notochord during embryonic development, which subsequently gets replaced by a vertebral column (backbone) formed of cartilage or bone in adults.
As the replacement of notochord by vertebral column is a characteristic feature distinguishing vertebrates from other chordates, R is able to explain A correctly.
Hence, the right answer is option (2) Both A and R are true and R is the correct explanation of A.
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