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Question

Write down four main characters of Annelida.


Solution

(i) Body triloblastic, bilaterally symmetrical, soft, elongated, vermiform and cylindrical or dorsoventrally flattened.
(ii) Exoskeleton absent; body is covered by a thin cuticle.
(iii) Alimentary canal is tube-like, complete and extends straight from mouth to anus.
(iv) Reproduction is by sexual means. Sexes may be united (hermaphroditic) or separate.
Example: Nereis (sand worm) and Hirudinaria (leech).


Biology
Science for Ninth Class - Part III - Biology
Standard IX

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