Multiple choice

Which of the following organisms possess flattened bodies?

  1. Poriferans

  2. Molluscs

  3. Platyhelminthes

  4. Nemathelminthes
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C Correct answer
Explanation

Platyhelminthes (flatworms) are characterized by dorsoventrally flattened bodies, which is why they are called flatworms. They include planarians (free-living) and flukes/tapeworms (parasitic). Poriferans are sponges, molluscs have soft bodies (often with shells), and nematodes are cylindrical roundworms.

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