Question

What is an air bladder?
A. Larva of Taenia solium
B. Swimming organ of amphibians
C. Hydrostatic or respiratory organ of teleost fishes
D. Excretory organ of teleost fishes

Answer 1

Hint: Swim bladder, gas bladder, or sir bladder these all are names of an internal organ present in fishes. This organ is gas-filled inside and it helps in controlling buoyancy of fishes, that is it helps in making light weight and helps in swimming.

Complete answer:
Do you know how fishes are able to float inside water?
Fishes have an organ in which only gas is present. Due to the presence of gas, the weight of bony fishes reduces considerably. And this gas organ is responsible for maintaining buoyancy of fishes inside the water. So, this organ is called a swim bladder, gas bladder, or air bladder.
It is present at different positions in different fishes and performs different functions.

Example- If it is present on the dorsal side that means the centre of mass is below the centre of volume. Which means it can act as a stabilizing agent. Air bladder can also act as a resonating chamber to produce or to receive different sounds.

So, let’s check the available options.
> Option A is Larva of Taenia solium – In the discussion we conclude that air bladder is present in fishes. Thus, this option is not correct.

> Option B is the Swimming organ of amphibians – These are small vertebrates, need water to live but they do not have an air bladder. Thus, this option is also not correct.

> Option C is Hydrostatic or respiratory organ of teleost fishes- From the discussion we can see that the air bladder helps in respiration and helps in floating in fishes. Thus, this option is the correct option.

> Option D is Excretory organ of teleost fishes- No, air bladder is not an organ of excretory system. Thus, this option is also wrong.

Hence, The correct answer is, option (C).

Note: Air bladder of swim bladder is a gas-filled organ, thus they can stay in current water without wasting energy in swimming. Also, the swim bladder functions as a resonating chamber, to produce or receive sound.