Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
Cartilaginous fishes have (1) placoid scales (2) cycloid or ctenoid scales (3) scroll valve (4) operculumA) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: D
Solution :
Characteristic Cartilagenous fish Habitat Mostly marine Caudal fin Heterocercal Mouth Ventral Gill opening Usually 5 pairs, no operculum Exoskeleion Placoid scales (f) Endoskeleton Cartilaginous (g) Intestine With scroll valve (h) Air bladder Absent
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