Question

Placoid scales are present in?

Answer 1

Placoid scales

1. They are called denticles because they are covered by a layer of dentine.
2. They are found embedded in the body of cartilaginous fishes.
3. They are rough structures that are triangular.

Placoid scales are present in:

1. Placoid scales are found in rays and sharks.
2. Rays and sharks come under elasmobranchs which are cartilaginous fishes.
3. They help in the protection and defense of fish by camouflage.