The body of Rohu fish is covered by

• cycloid scale, but the tail of homocercal

• placoid scale, but the tail of heterocercal

• cycloid scale, but the tail of heterocerca

• placoid scale, but the tail is homocercal

Which one is an example of living fossil?

• Coral

• Ascidia

• Octopus

• King crab

Which one of the following matching pairs is incorrect?

• Mollusca - Pseudocoel

• Cnidaria - Nematocyst

• Annelida - Chloragogen cells

• Echinodermata - Water vascular system 

Which one of the following matching pairs is incorrect?

• Shell fish - Pisces

• Silver fish - Arthropoda

• Cuttle fish - Mollusca

• Star fish - Echinodermata

Which one of the following group of animals is homeothermic?

• Reptiles

• Amphibians

• Birds

• Fishes

Which one of the followings is not a characteristic feature of mammals?

• Diphyodont tooth

• Ten pairs of cranial nerves

• Seven cervical vertebrae

• Left aortic arch in the circulatory system

257.

Antelope cervicapra is

• a mammal

• commonly known as black back

• an animal under data deficient category of wildlife

• a threatened Indian wildlife

The largest type of nematocysts in Hydra is

• Holotrichous isorhizas

• Atrichous isorhizas

• Desmonemes

• Stenoteles

Which of the following represents the class of Tubifex?

• Echiurida

• Archiannetida

• Hirudinea

• Oligochaeta

Select the mismatch from those given below.

• Noctiluca bioluminescence

• Gonyaulax catenella saxitoxin

• Pyrodinum red tide

• Ceratium-zygotic meiosis