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2 marksNutrition in Living Organisms

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

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

Explain the significance of chemical digestion of food.

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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)(ii)Give TWO reasons why mechanical digestion of food is important.[2 marks]

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