Write the characteristics of Phylum Cnidaria.
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Write the characteristics of Phylum Cnidaria.
No copied answers please.
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Phylum Cnidaria also called Coelentrata. This name of Cnidaria due to single cavity 'coelenteron'.
→ The Cnidarian have tissue but don't have organ or organ system. That's why they posses tissue level of organization.
→ They are Radially symmetry and Diploblastic.
a) Radial Symmetry :- In which body can be divided into two equal halves by any plane passing through the centre from top to bottom.
b) Diploblastic :- Organsims in which cells are arranged into endoderm and ectoderm layers are called Diploblastic animals.
→ No separate body cavity or coelom.
→ They have single aperture mouth but not anus. They have incomplete digestive system.
→ They respire through body surface by diffusion.
→ They excrete through body surface by diffusion.
→ Segmentations are absent in them.
→ Tentacles are present in them which acts as appendages.
→ They are aquatic, mostly marine and free living animals.
→ They reproduce by both sexually and asexually.
→ Ex :- Sea-pan, Sea-fan, Brain coral etc.
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