state three salient features of phylum coelenterata?
Answers
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1. All coelenterates are found in water. Most of the forms live in the sea (marine forms), except a few, like Hydra, which are found in freshwater.
2. Body is radially symmetrical.
3. These are the first of multicellular animals which possess tissue level organisation with a distinct division of labour.
4. The body has a single, sac-like central cavity, called coelenteron or the gastrovascular cavity, with only one opening.
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(1) Coelenterates are multicellular organisms
(2) They have tissue-grade of organization
(3) The body is radially symmetrical. Radial symmetry is the symmetry of a wheelPolyps and Medusa in Hydra
(4) All the members of this phylum are aquatic
(5) The are solitary or colonial
(6) Two types of individuals occur in the life cycle. They are polyps and medusa