alleryCnidarians that exhibit polyp and medusa alternating in the life cycle (Metagenesis) include
AAurelia
BAdamsia
CObelia
DPhysalia
Answer & Solution
Correct answer: C. Obelia
1. Metagenesis is the alternation between polyp and medusa generations.
2. Polyps produce medusae asexually and medusae produce polyps sexually.
3. Obelia is a classic example that displays this alternation.
4. Aurelia exists mainly as medusa, Adamsia as polyp, and Physalia is a colonial polyp.
_Source: syllabus Biology, Ch 4 "Animal Kingdom", §4.2.2_
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