Animal Kingdom Question 716
Question: Polymorphism occurs in
[BHU 1997]
Options:
A) Anthozoa
B) Scyphozoa
C) Rhizopoda
D) Hydrozoa
Show Answer
Answer:
Correct Answer: D
Solution:
Hydrozoa, cnidarians exhibit two basic body forms called polyp and medusa.
The former is a sessile and cylindrical form like Hydra, Adamsia, etc. whereas, the latter is umbrella-shaped and free-swimming like Aurelia or jelly fish.
Those cnidarians which exist in both forms exhibit alternation of generation (Metagenesis), i.e., polyps produce medusae asexually and medusae form the polyps sexually (e.g., Obelia) So, the correct answer is ‘Hydrozoa’
BETA
