Standard Science Primary 4 Systems

What is the function of saliva in the mouth during the process of digestion?

A To kill all the bacteria in the food.
B To soften the food and start the chemical breakdown of starch.
C To absorb nutrients directly into the tongue.
D To transport food down the gullet.
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Worked Solution

Step 1: Identify the first stage of digestion (Mouth). Step [2-9]: Teeth break food physically; saliva breaks it chemically. Step [2-9]: Saliva contains enzymes that begin the digestion of carbohydrates/starch.

Correct answer: To soften the food and start the chemical breakdown of starch.

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