Question

In metagenesis of cnidarian like Obelia, the polyps and medusae are respectively

• A. 2n and 2n
• B. n and 2n
• C. n and n
• D. 2n and n

Answer 1

The correct option is A 2n and 2n

Ploidy

Obelia (Sea Fur) belonging to the class Hydrozoa of the Kingdom Cnidaria consists of mostly marine and few freshwater animal species that show polyp (cylindrical) as well as medusa (umbrella-shaped) form in their life cycle. Polype (2n) by budding (asexually) reproduces medusae (2n), while medusae contain gonads and sexually form the polyps. Therefore, it exhibits alternation of sexual and asexual stages in its lifecycle known as metagenesis. where both the phases are diploid (2n).

Final answer

(c) 2n and 2n