Question

Give a comparative account between porifera and Cnidaria.

Answer 1

Porifera: Porifera represents the group of invertebrate animals which are having porous body with numerous pores and which are completely stationary or fixed in a particular place.

Cnidaria: Cnidaria represents the group of invertebrate animals which are having stinging cells on their tentacles present around the opening of their body.

Characters	Porifera	Cnidaria
1. Body organization	Porifera show cellular level organization.	Cnidaria show tissue level organization.
2. Structure	Body is covered with numerous pores and one large opening.	They have only one pore on the top of the body.
3. Canal system	Present.	Absent.
4. Stinging cells	Absent.	Stinging cells are present on the tentacles present around their opening of their body.
5. Movement	They are stationary or fixed in a particular place.	Some of the animals under this phylum are stationary some are motile.