Write short note on Porifera

1.	Write short note on Porifera
Answer» \tThey are primitive animals.\tThey are generally multicellular organisms with specialised cells but these cells do not group together to form tissues.\tMost of them are marine, i.e., found in the seas. Some of them are also found in ponds and rivers.\tThey possess pores all over the body.\tReproduction can be by both sexual and asexual methods.\tSensory system is absent.\tMouth and **** are absent.\tA distinct canal system with inlets and outlets for water circulation inside the body is present. They obtain food and oxygen by means of water. The collar cells filter out food particles from the water current flowing through the canal system.\tExamples are:\xa0Sycon, Spongilla and Euplectella.

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