Question

Identify incorrect statements with regard to coelenterata.

• A. Gorgonia exhibits two basic forms called polyp and medusa
• B. Aurelia contains medusa stage
• C. Animals contain gastrovascular cavity
• D. Hydra is fresh water polyp

Answer 1

The correct option is A Gorgonia exhibits two basic forms called polyp and medusa

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. They have a central gastro-vascular cavity with a single opening, hypostome. Examples: Gorgonia - exhibits in polyp form. Hydra - a fresh water polyp.