Question

write the characteristic phylum Porifera and
phylum Cnidaria and give its examples​

Answer 1

Kingdom Animalia is divided into eleven major phylums.

1. Phylum Porifera
Primitive multicellular organisms with cellular level of organisation
They are generally marine and asymmetrical
Digestion is intracellular.
The body is supported by a skeleton made up of spicules or spongin fibres.
Sexes are not separate, thus they are called hermaphrodite (egg and sperms are in the same individual).
Sponges reproduce asexually by fragmentation and sexually by formation of gametes.
Fertilisation is internal
Development is indirect having a larval stage which is morphologically distinct from the adult.
Examples: Sycon, Spongilla, etc.

2. Phylum - Colenterata (Cnidaria)
They are aquatic, mostly marine, sessile or free-swimming.
Radially symmetrical animals
Exhibit a tissue level of organisation
They are diploblastic.
Digestion is intracellular and extracellular.
They have stinging capsules present on the tentacles and the body. These Cnidoblasts are used for anchorage, defense and for capture of prey.
They exhibit two basic body forms called polyp (sessile and cylindrical) and medusa (umbrella-shaped and free-swimming.
Examples: Physalia, Adamsia, etc.

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