First slide

Classification of Animals

Question

Which of the following organisms swim constantly to avoid sinking?

Moderate

A

Exocoetus
B

Pterophyllum
C

Hippocampus
D

Carcharodon

Solution

Air bladder regulates buoyancy. It is absent in the cartilaginous fishes (Chondricthyes). Thus, cartilaginous fishes (e.g., Carcharodon – great white shark) have to swim constantly to avoid sinking.
Hippocampus, Pterophyllum and Exocoetus possess air bladder.

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