alleryStart learning →What is the defining feature of a gastrovascular cavity?
AIt has a separate mouth and anus
BIt has only one opening for digestion
CIt has two chambers in sequence
DIt has no digestive enzymes at all
Answer & Solution
Correct answer: B. It has only one opening for digestion
1. The gastrovascular cavity is the simplest digestive arrangement.
2. It has only one opening, so the same hole serves for taking food in and passing waste out.
3. Flatworms, comb jellies and cnidarians such as jellyfish digest this way.
4. Cells lining the cavity secrete enzymes and then engulf the food particles.
_Source: OpenStax Biology 1e (CC BY 4.0), Ch 34 "Animal Nutrition and the Digestive System", section Invertebrate Digestive Systems_
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