Standard Science Primary 4 Systems

Which of the following occurs in the mouth during digestion?

A Absorption of water and mineral salts.
B Only chemical breakdown by saliva.
C Both mechanical breakdown by teeth and chemical breakdown by saliva.
D Only mechanical breakdown by teeth.
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Worked Solution

Step 1: Teeth cut and grind food (mechanical). Step 2: Saliva softens food and starts chemical breakdown. Step 3: Both processes happen simultaneously in the mouth.

Correct answer: Both mechanical breakdown by teeth and chemical breakdown by saliva.

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