(C) In Chondrichthyes (cartilaginous fishes),the air bladder (swim bladder) is absent,which forces them to swim constantly to avoid sinking. In contra

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Chondrichthyes - Air bladder present,Osteichthyes - Air bladder absent.

(C) In Chondrichthyes (cartilaginous fishes),the air bladder (swim bladder) is absent,which forces them to swim constantly to avoid sinking. In contrast,Osteichthyes (bony fishes) possess an air bladder that regulates buoyancy. Therefore,the statement in option $C$ is incorrect because it reverses the presence of the air bladder between the two classes.

Class 11 Biology Animal Kingdom Mix Examples - Animal Kingdom

Easy

Which of the following differences between Chondrichthyes (cartilaginous fishes) and Osteichthyes (bony fishes) is incorrect?

A
Chondrichthyes - Endoskeleton is cartilaginous,Osteichthyes - Endoskeleton is bony.
B
Chondrichthyes - Respiration through $5-7$ pairs of gills,Osteichthyes - Respiration through $4$ pairs of gills.
C
Chondrichthyes - Air bladder present,Osteichthyes - Air bladder absent.
D
Chondrichthyes - Caudal fin is heterocercal (unequal),Osteichthyes - Caudal fin is homocercal (equal).