Question
Write down four general characters of cnidarians (coelenterates). Give two examples.
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Answer
- Cnidarians or coelenterates are multicellular, diploblastic animals with tissue grade of organisation. A gelatinous layer called mesoglea persists between the ectoderm and endoderm.
- Body shows radial symmetry.
- Respiratory, circulatory and excretory organs are absent.
- Nervous system is primitive, has only network of nerve cells.
Example: Hydra and Aurelia (jelly-fish).
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