Multiple choice

The undigested food in Hydra is expelled from

  1. cloaca

  2. anus

  3. mouth

  4. general body surface
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Hydra has a sac-like body plan with a single opening that serves as both mouth and anus. This opening, surrounded by tentacles, is used for both ingestion (taking in food) and egestion (expelling undigested material). Hydra lacks a true digestive tract with separate openings.

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