Which one of the following statements about all the four of Spongilla, leech, dolphin and penguin is correct?

• Penguin is homoiothermic while the remaining three are poikilothermic 

• Leech is a fresh water from while all other are marine

• Spongilla has special collared cells called choanocytes, not found in the remaining three

• Spongilla has special collared cells called choanocytes, not found in the remaining three

Which one of the following statements about certainly given animals is correct?

• Roundworms (Aschelminthes) are pseudocoelomates

• Molluscs are acoelomates

• insects are pseudocoelomates

• insects are pseudocoelomates

33.

Which one of the following kinds of animals are tribalistic?

• Flatworms

• Sponges

• Ctenophores

• Ctenophores

Crocodile and penguin are similar to whale and dogfish in which one of the following features?

• possess a solid single -stranded central nervous system

• lay eggs and guard them till they hatch

• possess a bony skeleton

• possess a bony skeleton

Which one onf the following groups of animals is bilaterally symmetrical and triploblastic?

• Coelenterates (cnidarians)

• Aschelminthes (roundworms)

• ctenophores

• ctenophores

A change in the amount of yolk and its distribution in the egg will effect

• formation of a zygote

• the pattern of cleavage

• number of blastomeres produced

• number of blastomeres produced

Which one of the following pairs of animal comprises' jawless fishes'

• Lampreys and eels

• Mackerels and rohu

• Lampreys and hag fishes

• Lampreys and hag fishes

Which one of the followings in birds, indicates their reptilian ancestry?

• Scales on their hind limbs

• Four chambered heart

• Two special chambers crop and gizzard in their digestive tract

Cellulose is the major component of cell walls of 

• Pythium

• Xanthomonas

• Pseudomonas

• Pseudomonas

Which one of the following is not a characteristic of phylum-Annelida?

• Closed circulatory system

• Segmentation

• Pseudocoelom

• Pseudocoelom