Question

Air bladder in most fishes is a

• A. Purely respiratory organ
• B. Major respiratory organ associated with lung
• C. Hydrostatic organ, as an outgrowth of alimentary canal
• D. None of the above

Answer 1

The correct option is C Hydrostatic organ, as an outgrowth of alimentary canal

The swim bladder or air bladder is an internal gas-filled hydrostatic organ, that develops as the diverticulum of the alimentary canal. It contributes to the ability of a fish to control its buoyancy and thus to stay at the current water depth without having to waste energy in swimming. Thus, the correct answer is option C.