Home
Class 11
BIOLOGY
Scales in chondrichthyes are...

Scales in chondrichthyes are

A

Placoid

B

Ganoid

C

Cycloid

D

Sesamoid

Text Solution

Verified by Experts

The correct Answer is:
A
Placoid scales are dermal scales characteristic of cartilaginous fishes. They are modified teeth and are covered with hard enamel. They grow out of the dermis layer and this why they are called dermal denticles.
Promotional Banner

Similar Questions

Explore conceptually related problems

Teeth in chondrichthyes are modified

Assertion: Chondrichthyes swim constantly in water body to avoid sinking. Reason: In chondrichthyes, air bladder is not found.

Which types of scales are found in chondrichthyes and osteichthyes?

Type of fertilisation in Chondrichthyes and osteichthyes is____

The members of Chondrichthyes have to swim constantly to avoid sinking due to

Choose the correct statements : I. Cartilaginous fish swims continously due to the presence of an air bladder. II. Osteichthyes have four pairs of gills that are covered by an operculum. III. The notochord is persistent throughout life in Chondrichthyes. IV. Teeth of cartilaginous fishes are modified placoid scales.

In chondrichthyes, claspers are seen on

In chondrichthyes, claspers are seen on

The chief nitrognous waste in class-Chondrichthyes members is