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Given below are two statements. One is labeled as Assertion (A) and the other is labeled as Reason (R).
Assertion (A) : Cartilaginous fishes have to swim constantly to avoid sinking.
Reason (R) : Air bladder which regulates buoyancy is absent in the members of class chondrichthyes.
In the light of the above statements, choose the most appropriate answer from the option given below.

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(A) is correct but (R) is not correct.

(A) is not correct but (R) is correct.

Both (A) and (R) are correct and (R) is the correct explanation of (A).

Both (A) and (R) are correct and (R) is not the correct explanation of (A).

answer is C.

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Detailed Solution

Air bladder of fishes is a hydrostatic organ which regulates buoyancy. Air bladder is absent in the members of Chondrichthyes. They constantly swim to avoid sinking.

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