previous year question on porifera class 11th
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PHYLUM PORIFERA
Members of this phylum are commonly known as sponges.
Waterenters in the body of sponges through minute pores (ostia) in the body wall into a central cavity, spongocoel, from where it goes out through the
Choanocytes or collar cells line the spongocoel and the canals.
Digestion is intracellular, skeleton made up of spicules or spongin fibres, they are hermaphrodites.
Sponges reproduce asexually by fragmentation and sexually by formation of gametes, fertilization is internal and development is indirect.
Examples- Sycon (Scypha), Spongilla (Fresh water sponge)
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