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2 marksNutrition in Living Organisms

CSEC Biology · May/June 2016 · Paper 2 · Question 1(c)(ii)

Before food can be chemically digested by enzymes, it must first be mechanically broken down in the alimentary canal.

Give TWO reasons why mechanical digestion of food is important.

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Other parts of this question

  1. 1(a)(i)Plot a graph on the grid provided on page 5 to show the relationship between the number of oxygen bubbles released and temperature.[4 marks]
  2. 1(a)(ii)From your graph, determine the optimum temperature for the enzyme.[1 mark]
  3. 1(a)(iii)Explain the shape of the graph at EACH of the following temperature ranges: 0-10 °C, 11-40 °C, > 40 °C[6 marks]
  4. 1(a)(iv)Write a conclusion that the students could draw from their results.[1 mark]
  5. 1(a)(v)Suggest ONE reason why living organisms need to maintain a constant internal temperature.[1 mark]
  6. 1(a)(vi)Describe TWO precautions that the students should take when doing this experiment.[2 marks]
  7. 1(a)(vii)How could this experiment be modified to investigate the effect of pH on enzyme activity?[2 marks]
  8. 1(b)Name TWO enzymes that function in protein digestion and describe the role of EACH.[2 marks]
  9. 1(c)(i)Name TWO parts of the alimentary canal that are responsible for the mechanical digestion of food.[2 marks]
  10. 1(c)(iii)Explain the significance of chemical digestion of food.[2 marks]

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