Cnidarians that exhibit polyp and medusa alternating in the life cycle (Metagenesis) include
A{'text': 'Aurelia', 'label': 'A'}
B{'text': 'Adamsia', 'label': 'B'}
C{'text': 'Obelia', 'label': 'C'}
D{'text': 'Physalia', 'label': 'D'}
Answer & Solution
Correct answer: C. {'text': 'Obelia', 'label': 'C'}
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: NCERT Class 11 Biology, Ch 4 "Animal Kingdom", §4.2.2_
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