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

Ctenophorans are commonly referred to as

(1) Flatworms

(2) Comb jellies

(3) Sea anemone

(4) Cnidaria

The skeleton of corals is made up of

(1) Calcium silicate

(2) Calcium phosphate

(3) Hydroxyapatite

(4) Calcium carbonate

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

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

Ctenophora is an exclusively marine phylum, the other such phylum is

(1) Mollusca

(2) Echinodermata

(3) Porifera

(4) Coelenterata

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

1. Leech

2. Sponges

3. Pleurobrachia

4. All of the above