O-LevelBiologyHuman Nutrition5090/11 · Oct/Nov 2017 · Q101 Mark

After eating, the pH in the mouth decreases. Which statement explains this decrease?

ABacteria release acids.

BEnzymes in saliva release acids.

CSalivary glands release acids.

DSensory neurones in the tongue release acids.

✓ Correct answer

A: Bacteria release acids.

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Topic: Human Nutrition, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2017 Paper 1 Variant 1, question 10.

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