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Ascaris is characterized by

1. absence of true coelom but presence of metamerism
2. presence of neither true coelom nor metamerism
3. presence of true coelom but absence of metamerism
4. presence of true coelom and metamerism (metamerisation)

Correct answer: presence of neither true coelom nor metamerism

Solution

Ascaris is a nematode, and nematodes lack a true coelom; they have a pseudocoelom instead. They also do not show metameric segmentation, so the correct characterization is absence of both true coelom and metamerism.

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