The Digestive System

Question 1 • Biology - SC3209 IC

Which best differentiates between chemical digestion and mechanical digestion?

Answer

Chemical digestion happens in the small intestine; mechanical digestion happens in the mouth.

Chemical digestion involves the breaking down of food with enzymes; mechanical digestion is breaking down food by chewing and tearing with teeth.

Chemical digestion is the breakdown of fats; mechanical digestion is the breakdown of proteins.

Chemical digestion is done only by the major structures of the digestive system; mechanical digestion is done by the accessory structures of the digestive system.

Explanation

Chemical digestion uses enzymes to break food molecules into smaller chemical substances. Mechanical digestion physically breaks food into smaller pieces, such as when teeth chew and tear food. Choice B correctly describes both processes; the other choices wrongly limit where digestion happens or which nutrients are broken down.

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