which one is the characteristic feature of phylum porifera?Full Marks : 2 A) tentacles
B)ostia
C)hypostome
D)coelenteron
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which one is the characteristic feature of phylum porifera?Full Marks : 2 A) tentacles
B)ostia
C)hypostome
D)coelenteron
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Organisms belonging to this phylum do not have specialised digestive, nervous or circulatory system. Instead, they have a water transport or canal system, which achieves the functions of digestion, excretion and also an exchange of gases.
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.