Question

For life cycle of Obelia, most appropriate term used is

• A. Alternation of generation
• B. Metamerism
• C. Metagenesis
• D. Both b and c

Answer 1

The correct option is C Metagenesis

$\text{Metagenesis}$
Obelia (Sea fur) belongs to the class Hydrozoa of the kingdom Cnidaria that shows polyp (cylindrical) as well as medusa (umbrella-shaped) forms in its life cycle.

Polyps, through the process of asexual reproduction (budding), form the free-swimming medusae, while medusae contain gonads and sexually reproduce to form the polyps.

Therefore, Obelia exhibits alternation of sexual and asexual stages in its lifecycle known as metagenesis, where both the phases are diploid.

$\text{Final answer}$

b. Metagenesis