Question
Biology Question on Classification Of Animals
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
Answer
Platyhelminthes-Diploblastic organisation
Explanation
Solution
Annelids and arthropods: Bilateral symmetry: Correct. Both phyla exhibit bilateral symmetry.
Sponges: Acoelomates: Correct. Sponges lack a coelom (body cavity).
Coelenterates and Ctenophores: Radial symmetry: Correct. Both phyla exhibit radial symmetry.
Platyhelminthes: Diploblastic organisation: Incorrect. Platyhelminthes (flatworms) are triploblastic, meaning they have three germ layers (ectoderm, mesoderm, and endoderm). Diploblastic organisms only have two germ layers (ectoderm and endoderm).