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Body organisation and symmetry across phyla
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Which of the following pairs is an incorrect match?A Annelids and arthropods-Bilateral symmetryB Sponges-AcoelomatesC Coelenterates and Ctenophores-Radial symmetryD Platyhelminthes-Diploblastic organisationPlatyhelminthes (flatworms) are triploblastic organisms (having three germ layers), not diploblastic — so this pairing is incorrect. The other pairs are correctly matched: annelids/arthropods show bilateral symmetry, sponges are acoelomate, and coelenterates/ctenophores show radial symmetry.