Question

Obelia is characterised by
A. Ciliated free swimming planula larva
B. Metagenesis
C. Acraspedote medusa
D. Statocysts present in medusoid stage

• A. A and B
• B. B only
• C. A, B & D
• D. A, B, C & D

Answer 1

Answer: (C)

Obelia (sea fur) belong to class hydrozoa, phylum cnidaria. After fertilization in Obelia ciliated free swimming larva-planula is formed. Obelia show alternation of generations or metagenesis. Medusae are sexual forms and bear true velum, marked by narrow they like ridge. Such medusa are called craspedote medusae.