Question

Cartilaginous fishes are characterised by the presence of
A) Terminal mouth
B) Ventral mouth
C) A homocercal tail
D) A heterocercal tail

Answer 1

according to the question just given an answer D

Answer 2

Answer:

B) Ventral mouth and D) A heterocercal tail is a correct answers.

Explanation:

A) Terminal mouth: Fishes that belong to the class Osteichthyes have their mouth located terminally. Hence, the option is Incorrect.

B) Ventral mouth: Fishes that belong to the class Chondrichthyes have their mouth located ventrally. because of the ventral mouth, their jaws are more powerful. Hence, the option is Correct.

C) A homocercal tail: These are mainly found in the fishes which belong to the class Osteichthyes. The vertebral column is bent upwards and the dorsal and the ventral lobe of the caudal fin are alike. Hence, the option is Incorrect.

D) A heterocercal tail: These are mainly found in the fishes which belong to the class Chondrichthyes, the vertebral column is bent upward at the end and the dorsal and ventral lobes of the caudal fin are unequal. hence, the option is also Correct.