Which statement correctly describes the alimentary canal of hydra?
Correct answer: D. All of the above
- A. The alimentary canal is formed from the endodermal cells
- B. The alimentary canal has a single opening
- C. The alimentary canal is saclike
- D. All of the above
Explanation
In simple invertebrates, such as hydras and flatworms, the digestive system is a sac with a single opening. A hydra has a central cavity that holds prey; the cavity is lined by a layer os specializd cells that secrete digestive enzymes to break down the prey's tissues.
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About Digestion
The human digestive system covers the organs from mouth to anus, the movement of food, and the mechanical and chemical breakdown of carbohydrates, proteins and fats. It also includes the roles of digestive enzymes, bile, absorption through intestinal villi, and the assimilation of nutrients by body cells.
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