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3 marksFood and Nutrition

CSEC Integrated Science · May/June 2016 · Paper 2 · Question 3(a)

Inadequate brushing after meals can cause mouth pH to drop below 5.5, damaging enamel and forming cavities.

Suggest THREE habits, other than brushing regularly, that could explain why Cindy has fewer cavities than her twin Joan.

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Other parts of this question

  1. 3(b)(i)Name a substance that can be used to measure the pH of toothpaste.[1 mark]
  2. 3(b)(ii)Arrange the four toothpaste brands in descending order of acidity (most acidic first) using their letters.[2 marks]
  3. 3(b)(iii)Identify the toothpaste brand with an incorrect pH in Table 2 and give a reason.[2 marks]
  4. 3(b)(iv)State a possible source of error that may have caused Frank to obtain the incorrect result.[1 mark]
  5. 3(b)(v)State ONE component in toothpaste that helps strengthen teeth.[1 mark]
  6. 3(c)(i)Name ONE acidic and ONE alkaline substance present in the human digestive system.[2 marks]
  7. 3(c)(ii)Name ONE digestive enzyme that operates best in an alkaline medium.[1 mark]
  8. 3(c)(iii)Explain the scientific principle by which antacids relieve digestive problems.[2 marks]

More practice: the rest of this paper · more Food and Nutrition questions · all CSEC Integrated Science past papers