Pisces

Amphicoelous vertebrae is with

• with a centra which is concave at both ends

• with a centra which is convex at both ends

• convex and concave centra

• none of the above

Patches of sensory cells running along each sides in fishes

• lateral line system

• neuromast organ

• gill filament

• none of the above

sensory structures in fishes which detect movements in surrounding water

Excretory organ in fishes

• paired kidneys

• opisthonephric kidneys

• kidneys

• None

Salt secreting glands in fishes

• caudal fin

• cloaca

• rectal glands

• none of the above

In chondrictheys, the absorptive area of the intestine is increased by

• mitral valve

• tricuspid valve

• spiral valve

• spiracle

sense organs on the head in elasmobranchs

In fishes if the upper and lower lobes of the tail are about the same size, it is

• heterocercal

• homocercal

• caudal fin

• none

In Periophthalmus, ------------functions as the accessory respiratory organ

labyrinthine organ is used for respiratin in

• Channa

• mud skipper

• Anabas

• none