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Cartilaginious fishes have I. Scoroll ...

Cartilaginious fishes have
I. Scoroll valve `" "` II. Operculum
III. Placoid scale`" "` IV. Cycloid or ctenoid scales
Choose the correct option.

A

I and II

B

II and IV

C

I and III

D

I, II and III

Text Solution

Verified by Experts

The correct Answer is:
C
Cartiaginous fishes belong to class-Chondrichthyes in which exoskeleton is cartilaginous wit h placoid scales and the gills are not covered by an operclum (gill cover). A spiral valve called scroll valve is present in t he intestine to increase the absorptive surface area.
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