Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Obelia exhibits metagenesis, where polyps produce medusae asexually and medusae form polyps sexually. Reason (R): All cnidarians exhibit both polyp and medusa forms in their life cycle. In the light of the above statements, choose the correct answer from the options given below:

Step-by-step solution

Assertion (A) is correct because Obelia exhibits alternation of generation (metagenesis), where the asexual polyp generation alternates with the sexual medusa generation. Reason (R) is incorrect because not all cnidarians exhibit both forms. For example, Hydra exists only in the polyp form, while Aurelia (jellyfish) exists only in the medusa form. Therefore, Assertion (A) is correct but Reason (R) is incorrect. Answer: Assertion (A) is correct but Reason (R) is incorrect