Statement (S). Fishes belonging to Chondrichthyes have heterocercal caudal fin.
Reason (R). These fishes have an air bladder that acts as a hydrostatic organ.

S is correct but R is wrong

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S is wrong but R is correct

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Both S and R are correct and R is correct explanation to S

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Both S and R are correct and R is not correct explanation to S

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Solution

The correct option is A S is correct but R is wrong
Answer is option A i.e. "S is correct but R is wrong"
Chondrichthyes are the cartilageous fishes. They have skeletons made of cartilage rather than bone. One of the important characteristics present in Chondrichthyes is the heterocercal caudal fin, which helps in locomotion. It is organ called swim bladder, a sac of air that acts as a hydrostatic organ and not heterocercal caudal fin.

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Statement (S). Fishes belonging to Chondrichthyes have heterocercal caudal fin.Reason (R). These fishes have an air bladder that acts as a hydrostatic organ.

Statement (S). Fishes belonging to Chondrichthyes have heterocercal caudal fin.
Reason (R). These fishes have an air bladder that acts as a hydrostatic organ.