characteristics of phylum porifera
Answers
Explanation:
Characteristic Features of Phylum Porifera
They are generally marine aquatic organisms, with a few freshwater species.
Their bodies are asymmetrical.
Body shape can be cylindrical, vase-like, rounded or sac-like.
They are diploblastic animals with two layers, the outer dermal layer and the inner gastral layer. There is a gelatinous, non-cellular mesoglea, in between these two layers. This contains many free amoeboid cells.
The body has many pores called the ostia and a single large opening called osculum at the top.
Spongocoel is the body cavity that is present.
They have the characteristic canal system for the flow of water through the body.
Sense organs are absent.
There is an endoskeleton present with calcareous spicules (calcium carbonate) or siliceous spicules (silica) or sponging fibres (protein).
Sexes are not separate.
Asexual reproduction is seen through budding, fragmentation. Sexual reproduction is seen in certain species, through gametic fusion.
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Answer:
Characteristics of Poriferia are
- Poriferans have pores all over their body to draw water in.
- A large pore or opening is present at the top of the body to expel the incoming water.
- they are mainly found in sea; only a few occur in freshwater. They are found attached to the bottom of the sea or pond.
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