A) Hydra
B) Aurelia
C) Physalia
D) Obelia
Correct Answer: B
Solution :
Polyp and medusa are the asexual and sexual phase present respectively in coelente rates. The members of different classes can be differentiated by the presence or absence of these stages. Aurelia (jelly fish) belongs to class Scyphozoa, in which medusoid phase is dominant, polypoid phase absent. Hydra, Obelia, Physalia are the members of class Hydrozoa in which, both medusoid and polypoid stages are present. Metridium, Tubipora etc., belongs to class Anthozoa, with all polyps no medusae.
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