The number of gills present in Osteichthyes is

2 pairs

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6-15 pairs

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5 pairs

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4 pairs

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12 pairs

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Solution

The correct option is D 4 pairs
Osteichthyes are the bony fishes that breathe through gills. There are four pairs of gill slits protected by an operculum which is a lateral flap of skin.
Thus, the correct answer is option D.

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	Column-I		Column-II
(a)	Scales and paired fins absent	(i)	Torpedo
(b)	Claspers on pelvic fins of males	(ii)	Cyclostomes
(c)	4 pairs of gills covered with operculum	(iii)	Chondrichthyes
(d)	Electric organs	(iv)	Osteichthyes

Number of bond pairs and lone pairs present respectively on the central atom of xenon difluoride are

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