Which of the following has the highest number of gill slits?

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Petromyzon

Clarias

Labeo

Scoliodon

answer is B.

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Detailed Solution

Petromyzon (Cyclostomata) has seven pairs of gill-slits. Cyclostomes have 6-15 pairs of gill-slits. Five pairs of gill-slits are present in Scoliodon (Chondrichthyes). In Osteichthyes (e.g., Labeo and Clarias) have four pairs of gills. The gill-slits of each side are covered by an operculum.

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