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In Coelenterates, animals that exist as both POLYP and MEDUSA forms show:
AOpen circulatory system
BPseudocoelom
CBilateral symmetry
DAlternation of generations (Metagenesis) — e.g. Obelia: polyp produces medusa asexually, medusa produces polyp sexually
Answer & Solution
Correct answer: D. Alternation of generations (Metagenesis) — e.g. Obelia: polyp produces medusa asexually, medusa produces polyp sexually
Metagenesis = alternation between asexual polyp (sessile) and sexual medusa (free-swimming, umbrella-shaped). Obelia is the textbook example. Hydra is polyp-only; Aurelia is medusa-only.
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