Question:
Which of the following organ found in bony fishes keeps them floating in water without much expenditure of energy?
Which of the following organ found in bony fishes keeps them floating in water without much expenditure of energy?
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Air bladder = buoyancy control organ in bony fishes.
Updated On: Jul 18, 2026
- Gills
- Air bladder
- Bursa fabricii
- Diphycercal caudal fin
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The Correct Option is B
Solution and Explanation
Step 1: Understanding buoyancy in fishes.
Bony fishes need to maintain their position in water without sinking or floating uncontrollably. This requires regulation of body density relative to water.
Step 2: Role of air bladder.
The air bladder (swim bladder) is a gas-filled organ that helps fishes maintain buoyancy. It allows them to stay at different water depths without energy expenditure.
Step 3: Mechanism of function.
By adjusting gas volume inside the bladder, fish can increase or decrease buoyancy. This reduces the need for constant swimming to stay afloat.
Step 4: Evaluation of other options.
Gills are used for respiration, bursa fabricii is found in birds, and diphycercal caudal fin is for locomotion, not buoyancy control.
Step 5: Biological advantage.
The air bladder helps conserve energy and improves survival efficiency in aquatic habitats by enabling neutral buoyancy.
Step 6: Final conclusion.
Thus, the air bladder is responsible for floating in bony fishes.
Bony fishes need to maintain their position in water without sinking or floating uncontrollably. This requires regulation of body density relative to water.
Step 2: Role of air bladder.
The air bladder (swim bladder) is a gas-filled organ that helps fishes maintain buoyancy. It allows them to stay at different water depths without energy expenditure.
Step 3: Mechanism of function.
By adjusting gas volume inside the bladder, fish can increase or decrease buoyancy. This reduces the need for constant swimming to stay afloat.
Step 4: Evaluation of other options.
Gills are used for respiration, bursa fabricii is found in birds, and diphycercal caudal fin is for locomotion, not buoyancy control.
Step 5: Biological advantage.
The air bladder helps conserve energy and improves survival efficiency in aquatic habitats by enabling neutral buoyancy.
Step 6: Final conclusion.
Thus, the air bladder is responsible for floating in bony fishes.
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