Question

Scales of Elasmobranch are

• A. Ganoid
• B. Cycloid
• C. Ctenoid
• D. Placoid

Answer 1

The correct option is D Placoid

Placoid scales are tough scales that cover the skin of elasmobranchs. This is the group of fishes which includes the sharks and rays. These are the scales which are modified from of the scales in the other fishes. There are modified teeth like structures. There is a covering of enamel on this teeth. They are directed and oriented in the backward direction. The function of these scales is for protection against predators.

Thus, the correct answer is option D.