Describe life cycle of obelia with diagram in hindi
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1. It is a branched, fixed colony. Some of the horizontal branches anchoring the colony on some support are called Hydrorhiza while other branches are vertical and known as Hydrocaulus.
2. Each branch consists of a granular coenosarc made of two cell layers enclosing the coelenteron and surrounded by a thin transparent horny perisarc.
3. The vertical branches towards the base are further branched and all the branches end in zooids.
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