Question

Most fish do not sink in water because of the presence of
swim bladder
air bladder
air sacs
air in spongy bones
A.I and II are correct
B.II and III are correct
C.III and IV are correct
D.I, II, III and IV are correct

Answer 1

answer is mentioned below
D
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Answer 2

many species of Bony fish have an organ called swim bladder a long Chamber of soft flexible walls glasses from inside the fish Body Can diffuse into this chamber does increasing the volume this helps in the rising of the wish to the surface of the water when gas is contained in the chamber are released the walls of the chamber collapse there by decreasing the volume and hence a decrease in upthrust the fish go deep into the water hence digesting the value of sin letter to the required extend the fish can stay at any level in the water