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

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

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

1. Obelia

2. Taenia

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?

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

1. Mollusca

2. Echinodermata

3. Porifera

4. Coelenterata

Ctenophorans are commonly referred to as

1. Flatworms

2. Comb jellies

3. Sea anemone

4. Cnidaria