Question

Swim bladder is present in
A Star fishes
B Bony fishes
C Carp fishes
D All of the above

Answer 1

Hint: Most bony fish have a swim bladder, also known as an air bladder, which serves as a buoyancy organ.

Complete answer:
The swim bladder is derived from an out-pocketing of the digestive tube and is located in the body cavity. It is filled with gas (usually oxygen) and serves as a hydrostatic, or ballast, organ, allowing the fish to maintain its depth without floating upward or sinking.
It also functions as a resonating chamber for producing or receiving sound.
In some species, primarily freshwater fishes (catfish, and bowfin), the swim bladder is linked to the fish's inner ear. They are linked together by four Weberian ossicles from the Weberian apparatus. These bones are capable of transmitting vibrations to the saccule and lagena (anatomy).
Swim bladders are present in a variety of bony fish but not in cartilaginous fish.

So, Swim bladder is present in option B bony fishes.

Note:
In some primitive fish, it serves as a lung or respiratory aid rather than a hydrostatic organ. Some bottom-dwelling and deep-sea bony fish (teleosts), as well as all cartilaginous fish, lack a swim bladder (sharks, skates, and rays).