Q.

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

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a

6-15

b

4-15

c

4

d

6

answer is C.

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Detailed 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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