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Assertion: When any plane passing through the central axis of the body divides the organism into two identical halves, it is called radial symmetry. Reason: Sponges mostly show radial symmetry. |
Both assertion and reason are correct and reason is the correct explanation of assertion. Both assertion and reason are correct and reason is not the correct explanation of assertion. Assertion is correct but reason is incorrect. Assertion is incorrect but reason is correct. |
Assertion is correct but reason is incorrect. |
The correct answer is Option (3) -Assertion is correct but reason is incorrect. Animals 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. |
