Which phylum includes the model organism C. elegans?

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Prepare for the Diversity of Life Test. Explore diverse biological concepts through multiple choice questions, with hints and explanations included. Get exam-ready now!

Multiple Choice

Which phylum includes the model organism C. elegans?

Explanation:
C. elegans is a roundworm, which places it in the phylum Nematoda. Nematodes are unsegmented, cylindrical worms with a protective cuticle and a pseudocoelom that acts as a body cavity. This body plan distinguishes them from flatworms, which are flattened and lack a true body cavity; from segmented worms, which have true coeloms and segmented bodies; and from echinoderms, which have radial symmetry and a water vascular system. So the best answer is Nematoda.

C. elegans is a roundworm, which places it in the phylum Nematoda. Nematodes are unsegmented, cylindrical worms with a protective cuticle and a pseudocoelom that acts as a body cavity. This body plan distinguishes them from flatworms, which are flattened and lack a true body cavity; from segmented worms, which have true coeloms and segmented bodies; and from echinoderms, which have radial symmetry and a water vascular system. So the best answer is Nematoda.

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