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Write the general characters of the phyl...

Write the general characters of the phylum porifera.

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1. They are aquatic, asymmetrical.
2. They have pores all over the body.
3. They are multicellular with cellular level of organisation. Tissues are not formed.
4. They have canal system for circulation of water.
5. They have skeleton made of calcareous or siliceous spicules.
6. Nutrition is holozoic and digestion intracellular.
7. Asexual reproduction by fragmentation and gemmule formation.
8. Indirect development with parenchymula and amphiblastula larvae.
e.g.. Sycon and Spongilla.
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