Question

In which class of Coelenterate, the polyp and medusa both are found in one animal?

• A. Hydrozoa
• B. Scyphozoa
• C. Anthozoa
• D. None of the above

Answer 1

Answer: (A)

Hydrozoa

• 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 jellyfish.
• These 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).