Standard Science Primary 4 Systems

Digestive juices are added to food in the mouth, stomach, and small intestine. What is the main purpose of these juices?

A To move the food along the digestive tract
B To break down food into simpler substances
C To kill all the bacteria in the food
D To make the food soft for swallowing
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Worked Solution

Step 1: Digestion is the process of breaking down complex food. Step [2-9]: Chemical digestion requires enzymes found in digestive juices. Step [2-9]: These juices break down large molecules into small, soluble ones for absorption.

Correct answer: To break down food into simpler substances

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