Question

Choose the correct answers from the alternatives given.
Which one of the following body structure describes the freshwater hydra?

• A. A swimming medusa with mouth pointing upward
• B. A sessile medusa with mouth pointing upward
• C. A sessile polyp form with mouth pointing downward
• D. A freely moving polyp with mouth pointing upward

Answer 1

The correct option is D A freely moving polyp with mouth pointing upward

The life cycle of cnidarians can include a polyp stage and a medusa stage. The polyp is settled on a solid surface, with the mouth opening pointed upward. The polyp, also called the hydroid, tends to be elongated, with a thin body wall; it is attached to the ocean bottom or other surfaces by the end opposite the mouth, its tentacles pointing upward.

So, the correct option is, 'A freely moving polyp with mouth pointing upward'.