Question

Swim bladder or air bladder is present only in
A) Fish
B) Amphibia
C) Aquatic reptilia
D) Aquatic mammals

Answer 1

Q. Swim bladder or air bladder is present only in  

ans. A) Fish

Answer 2

Answer:

Option A is the correct answer.

Fish

• Only fish with bones have swim blades. By utilising the oil in their bodies, sharks and rays can stay buoyant in the water. However, not all boney fish have swimblades; many bottom-dwelling species have lost theirs since buoyancy is not important to them.

Explanation:

• The swim bladder, commonly known as the air bladder, is an organ of buoyancy found in most bony fish.
• An out pocketing of the digestive tube gave rise to the swim bladder, which is housed inside the body cavity.
• It serves as a hydrostatic organ, or ballast, allowing the fish to maintain its depth without rising or falling, and it carries gas (often oxygen).
• In order to create or receive sound, it also functions as a resonating chamber. Some species' swim bladders don't contain gas, but oil.
• Instead of serving as a hydrostatic organ, it helps some primitive fish breathe. All cartilaginous fish, including certain bottom-dwelling and deep-sea bony fish (teleosts), lack the swim bladder.

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