ZoologyStatement I: A shark can stay at a desired level in water without much expenditure of energy.Statement II: Shark has a buoyancy regulating organ called the swim bladder.

Statement I: A shark can stay at a desired level in water without much expenditure of energy.
Statement II: Shark has a buoyancy regulating organ called the swim bladder.

A
Statement-I is correct but Statement-II is incorrect
B
Statement-I is incorrect but Statement-II is correct
C
Both Statement-I and II are incorrect
D
Both Statement-I and II are correct

Solution:

Air bladder is absent in sharks (Chondrichthyes), and so they have to swim constantly to avoid sinking.

Bony fishes (Chondrichthyes) have air bladder acting as a hydrostatic organ helping the fish float easily at the desired level without much expenditure of energy.