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Diversity In Living Organisms — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceDiversity In Living Organisms3 Marks
Question
Write down four general characters of cnidarians (coelenterates). Give two examples.
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Answer

  1. Cnidarians or coelenterates are multicellular, diploblastic animals with tissue grade of organisation. A gelatinous layer called mesoglea persists between the ectoderm and endoderm.
  2. Body shows radial symmetry.
  3. Respiratory, circulatory and excretory organs are absent.
  4. Nervous system is primitive, has only network of nerve cells.
Example: Hydra and Aurelia (jelly-fish).

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