First slide

Classification of Animals

Question

Select the features of Scoliodon from the following.
a.   The mouth is located ventrally.
b.   The gill-slits are covered by operculum
c.   An air bladder regulates buoyancy
d.   Possesses a poison sting
e.   Teeth are modified placoid scales
f.   The heart is two-chambered

Moderate

A

c, e and f
B

a, b and f
C

a, d and e
D

a, e and f

Solution

Scoliodon (dogfish) is a cartilaginous fish of the class Chondrichthyes. Operculum and air bladder are the features of bony fishes. Poison sting is present in Trygon (stingray).

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