Biology notes for diversity in living organism in porifera
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Porifera
- This phylum consists of the sponges.
- They are mostly marine, very few are from fresh water.
- All the animals are sessile (fixed in one place).
- Cells are loosely arranged (cellular level of organization).
- Animals are diploblastic with outer ectoderm and inner endoderm held with jelly like mesoglea.
- Exoskeleton in the form of spicules made up of silica or calcium carbonate.
- Sponges have pores all over the body called ostia.
- Water from outside enters the body through ostia and leaves through one large opening called osculum.
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