First slide

Classification of Animals

Question

In bony fishes, how many pairs of gills are present?

Moderate

A

6-15
B

4-15
C

4
D

6

Solution

In Osteichthyes, 4 pairs of gills are present.
6-15 pairs of gill-slits are found in cyclostomes.
In Chondrichthyes 5-7 pairs (usually 5 pairs) of gill-slits are present.

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