Which of the following is common among mammals?

(1) They do not moult

(2) They have seven cervical vertebrae

(3) They are carnivores

(4) They have ventral nerve cord

Water transport system or canal system is a characteristic feature of which animal?

1. Spongilla

2. Hydra

3. Asterias

4. Echinus

Fresh water sponge is the common name of

(1) Hydra

(2) Sycon

(3) Spongilla

(4) Euspongia

Collar cells are present in the members of which phyla

1. Echinodermata

2. Coelenterata

3. Ctenophora

4. Porifera

Fragmentation is a method of asexual repoduction in

(1) Annelida

(2) Platyhelminthes

(3) Aschelminthes

(4) Porifera

Eggs and Sperm are produced by the same individual in case of

(1) Leech

(2) Sponges

(3) Pleurobrachia

(4) All of the above

The digestive system in Meandrina is

(1) Digestion is extracellular only

(2) Digestion is intracellular only

(3) Digestion is both extracellular and intracellular

(4) Digestion absent as it is a parasite

Both polyp and medusa life forms are present in the life cycle of

(1) Obelia

(2) Physalia

(3) Aurelia

(4) Adamsia

The skeleton of corals is made up of

(1) Calcium silicate

(2) Calcium phosphate

(3) Hydroxyapatite

(4) Calcium carbonate

Which of the following group consists exclusively of cnidarians?

(1) Aplysia, Gorgonia, Spongilla, Hydra

(2) Hydra, pennatula, obelia, Echinus

(3) Hydra, obelia, adamsia, physalia

(4) Scypha, Hydra, adamsia, physalia