Question

Bony fishes can stay at any particular depth in water without spending energy due to presence of

• A. Operculum
• B. Tympanum
• C. Pneumatic bones
• D. Swim bladder

Answer 1

The correct option is D Swim bladder

A. Operculum is the gill cover. It is a structure that covers the gill openings.

B. Tympanum is the external hearing structure or simply called as eardrum present in animals like reptiles, birds, amphibians, mammals.

C. Pneumatic bones are hollow bones present in birds with the help of which birds can fly.

D. Swim bladder or air bladder is present in Bony fishes. It is a gas filled organ that enables the bony fishes to swim and stay at any particular depth in water without spending energy.

So, the correct answer is 'Swim bladder'.