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Question

Presence of air bladder is a common feature of

A
Dipnoi.
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B
Teleostomi.
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C
Holocephali.
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D
Elasmobranchii.
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Solution

The correct option is B Teleostomi.
Teleostomi is a group of jawed vertebrates. This group includes tetrapods and bony fishes. The teleostomes develop a primitive lung which has the ability to use some atmospheric oxygen. The evolved species have developed the lung. Much evolved species have developed the swim bladder or air bladder. This helps the fishes to maintain the body at neutral buoyancy.
Thus, the correct answer is option B.

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