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Which of the following pairs is an incorrect match?
A
Annelids and arthropods-Bilateral symmetry
B
Sponges-Acoelomates
C
Coelenterates and Ctenophores-Radial symmetry
D
Platyhelminthes-Diploblastic organisation
Detailed Solution
Platyhelminthes (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.