Question

write short note on phylum cnidaria​

Answer 1

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Phylum Cnidaria :- e.g. Hydra, Aurelia (Jelly fish), Physalia (Portuguese man-of-war), Adamsia (sea anemone), Diploria (Brain coral), Gorgonia (sea fan). They are aquatic, mostly marine and few are fresh water forms. They are sessile or free swimming. They show radial symmetry and are diploblastic with blind-sac body plan. Animals exhibit two body forms. Polyp is cylindrical form (Hydra) and medusa is umbrella-like (Aurelia - Jelly fish).