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Q. Cartilaginous fishes have
(1) placoid scales
(2) cycloid or ctenoid scales
(3) scroll valve
(4) operculum

BHUBHU 2007

Solution:

Characteristic Cartilagenous fish
a Habitat Mostly marine
b Caudal fin Heterocercal
c Mouth Ventral
d Gill opening Usually 5 pairs, no operculum
e Exoskeleton Placoid scales
f Endoskeleton Cartilaginous
g Intestine With scroll valve
h Air bladder Absent