Question

Chondrichthyes is characterized by

• A. placoid scale and terminal mouth.
• B. ctenoid scale and terminal mouth.
• C. ctenoid scale and ventral mouth.
• D. placoid scale and ventral mouth.

Answer 1

Answer: (D)

Chondrichthyes is a class which belongs to subphylum Vertebrata of phylum Chordata. This class comprises of cartilaginous fishes. These fishes show the presence of a ventrally located mouth. The skin of these fishes is covered by minute placoid scales.
Ctenoid scales and terminal mouth is present in class Osteichthyes.