Body Symmetry Types in Animals — NEET Biology
📚 Practice ConceptAnimals can be categorised on the basis of their symmetry. Sponges are mostly asymmetrical, i.e., any plane that passes through the centre does not divide them into equal halves. When any plane passing through the central axis of the body divides the organism into two identical halves, it is called radial symmetry. Coelenterates, ctenophores and echinoderms have this kind of body plan. Animals like annelids, arthropods, etc., where the body can be divided into identical left and right halves in only one plane, exhibit bilateral symmetry.
Which of the following statements about body symmetry in animals are correct? S1. Sponges are typically asymmetrical, meaning no plane passing through the center divides them into equal halves. S2. Coelenterates and Ctenophores exhibit radial symmetry, where any plane through the central axis divides the organism into identical halves. S3. Adult Echinoderms display bilateral symmetry, while their larval forms are radially symmetrical. S4. Animals like Annelids and Arthropods exhibit bilateral symmetry, characterized by identical left and right halves in only one plane. S5. In radially symmetrical animals, directional movement is highly efficient due to a distinct anterior end.
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