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Wednesday, 23 September 2015

Short Notes On Phylum Porifera

Phylum Porifera –

- Marine.

- Multicellular, cellular grade body.

- Asymmetrical.

- Water canal system for food, respiration and excretion.

- Body wall with many pores – Ostia.

- Diploblastic.

- Water enters through Ostia and goes out through Osculum.

- Skeleton of spicules or spongin fibres.

- Hermaphrodite.

- Reproduction asexual by fragmentation and sexual by gametes.

- Fertilisation is internal, development indirect.

- eg. Sycon, Spongilla, Euspongiaetc.

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