Question

Mention the important characteristics of coelentrata and give example. ​

Answer 1

Answer:

Characteristics. All coelenterates are aquatic, mostly marine. The bodyform is radially symmetrical, diploblastic and does not have a coelom. The body has a single opening, the hypostome, surrounded by sensory tentacles equipped with either nematocysts or colloblasts to capture mostly planktonic prey.

Answer 2

• Aquatic / marine
• Sessile / free swimming
• radially symmetrical have cnedoblasts/ cnidocytes stinging capsule on tentacles.
• used for defence, ancourage and to capture the Prey
• tissue level of organisation
• diploblastic
• mouth of hypostome
• digestion extracellular and intracellular
• Coral have skeleton made of calcium carbonate
• exhibit two basic forms called polyp and Medusa
• they show alternation of generation where polyp forms Medusa asexually and Medusa forms polyp sexually
• for example obeliya, Hydra, brain coral

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