Question

Bony/teleost fishes are characterised by

• A. Cloaca
• B. Air bladder
• C. Placoid scales
• D. Ventral mouth

Answer 1

Answer: (B)

Air bladder

Bony fishes and Teleosts (ray-finned fishes) belong to class Osteichthyes.

A. Cloaca is cavity or aperture through which genital products or excretory products are released. It is absent in Osteichthyes.

B. Osteichthyes have an air bladder which facilitates the floating gills covered by an operculum.

C. Osteichthyes have cycloid, ctenoid and ganoid scales whereas placoid scales are present in Chondrichthyes.

D. Osteichthyes have a terminal mouth.

Hence, Bony/teleost fishes are characterized by air bladder. So, the correct answer is 'Air bladder'.