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Question

The number of gills present in Osteichthyes is

A
2 pairs
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B
6-15 pairs
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C
7 pairs
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D
3 pairs
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E
12 pairs
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Solution

The correct option is D 3 pairs
Osteichthyes are the bony fishes that have bone as a part of the endoskeleton, as opposed to the cartilaginous skeletons in cartilagenous fishes. This is the largest class of vertebrates. Osteichthyes possess three pairs of gill slits, which is protected by an operculum. There are many capillaries in the gill slits which helps in the transport of the oxygen to the tissues.
Thus, the correct answer is option D.

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