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Diversity In Living Organisms — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceDiversity In Living Organisms3 Marks
Question

Write down four main characters of Annelida.

✓

Answer

  1. Body triploblastic, bilaterally symmetrical, soft, elongated, vermiform and cylindrical or dorsoventrally flattened.
  2. Exoskeleton absent; body is covered by a thin cuticle.
  3. Alimentary canal is tube-like, complete and extends straight from mouth to anus.
  4. Reproduction is by sexual means. Sexes may be united (hermaphroditic) or separate.

Example: Nereis (sand worm) and Hirudinaria (leech).

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