Question

Which of the following character deviates cartilaginous fishes from bony fishes ?
(A) Absence of air bladder
(B) Presence of operculum
(C) Presence of Gills
(D) Marine habitat​

Answer 1

Answer:

Option (A) Absence of air bladder

Explanation:

• While the air bladder or swim bladder is present in bony fishes. These air bladders are internal gas-filled organs that help in maintaining buoyancy to stay at their current water with no wastage of energy in swimming or respiration. Also, it serves as accessory respiratory organs or lungs or as sound-producing organs.

• The cartilaginous fishes lack the air bladder. So they have to constantly swim to avoid sinking to the bottom of the water column.

Hence option A) absence of an air bladder is the character that deviates cartilaginous fishes from bony fishes.