Question

Write the important features of phylum Aschelminthes (Nematoda).

  • Diversity in living organisms CBSE Class 9
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Answer

(i) Most of them are small and cylindrical. So they are also called as round worms.

(ii) The body size ranges from microscopic to a few centimetres in length.

(iii) They all are mainly heterotrophic animals.

(iv) They are triploblastic.

(v) Body cavity has a true coelom.

(vi) Respiratory and circulatory systems are absent.

(vii) They have a complete alimentary canal.

(viii) Sexes are separate.

Examples: Ascaris (roundworm), Enterobius, and Wuchereria (filarial worm).

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