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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Adult echinoderms exhibit radial symmetry whereas their larvae are bilaterally symmetrical. Reason (R): Echinoderms possess a water vascular system which helps in locomotion, capture and transport of food, and respiration. In the light of the above statements, choose the most appropriate answer fro

Options

  1. ABoth Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
  2. BAssertion (A) is true but Reason (R) is false.
  3. CAssertion (A) is false but Reason (R) is true.
  4. DBoth Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).

Correct answer

D. Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).

Step-by-step solution

Assertion (A) is true. Echinoderms are unique in their symmetry; adult echinoderms are radially symmetrical but their larvae are bilaterally symmetrical. Reason (R) is also true. The most distinctive feature of echinoderms is the presence of a water vascular system which helps in locomotion, capture and transport of food, and respiration. However, Reason (R) does not explain Assertion (A). The developmental shift in symmetry is not caused by the presence of the water vascular system. Therefore, both Assertion (A) a

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