First slide

Classification of Animals

Question

A student observed a specimen and identified it as a bony fish. The character by which he identified is

Easy

A

placoid scales on its body
B

operculum on gills
C

oil gland near its caudal fin
D

circular and sectorial mouth

Solution

Operculum on gills is the salient feature of bony fishes.
Placoid scales are present in cartilaginous fishes.
Oil gland near tail is seen in birds.
Circular and sectorial mouth is the feature of cyclostomes.

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