Question

On the basis of the characteristics given below, name the phylum or class:
Animals with porous body and cellurlar organization _______.

Answer 1

Porifera

It's characteristic features are :

1. Exclusively marine, mostly aquatic.

2. Cellular level of organisation.

3. Adults are sessile and young ones are free swimming.

4. Water enters into the large body cavity through ostia and comes out through osculum. This is known as water canal system.

5. Water canal system helps in food gathering, respiratory gases and removal of waste.

6. Body is made up of spicules.

7. Primitive and multicellular.

8. Nutrition: Holozoic and digestion: Intracellular.

9. Fertilization: Internal and development: Indirect.