Phylum Porifera & its general chractets
Answers
Answer:
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Explanation:
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.
Their bodies do not show any symmetry and their shape is adapted so as to allow maximum efficiency of water flow through the central cavity that is present inside. They generally feed on bacteria and other food particles that are present in the water. Their bodies have a large central cavity called the spongocoel. Water enters through the ostia into the spongocoel and goes out through the osculum. Cells called as Choanocytes or collar cells line up the spongocoel and canals, with their flagellum protruding out. It is the beating of this flagellum from all choanocytes that moves the water all through the body of the sponge.
Answer:
.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.