Which characteristic is true for Obelia?
1.  Metagenesis
2.  Morphogenesis
3.  Apolysis
4.  Pedogeny

Which of the following animals have scattered cells with cell–tissue grade organization:

1. Sponge

2. Hydra

3. Liver fluke

4. Ascaris

In Hydra, waste material of food digestion and nitrogenous waste material are removed from:
1.  Mouth and mouth
2.  Body wall and body wall
3.  Mouth and body wall
4.  Mouth and tentacles

In which animal nerve cell is present but the brain is absent:

1. Sponge

2. Earthworm

3. Cockroach

4. Hydra