Question

Teleost fish is differentiated externally from elasmobranch fish by

• A. Endoskeleton
• B. Exoskeleton
• C. Operculum
• D. Stream-lined body

Answer 1

The correct option is C Operculum

A. Endoskeleton is the internal skeleton.

B. Exoskeleton is the external skeleton.

C. Operculum is the gill cover.

D. Stream-lined body is the body shape that suffers less friction and aids in swimming.

Teleost fish are bony fishes and elasmobranch fishes are the cartilaginous fishes. The gills of teleost fishes are covered by operculum whereas, operculum is not present in elasmobranch fishes.

So, the correct answer is 'Operculum'.