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4 marksCellular Respiration and ATP Synthesis

CAPE Biology Unit 2 · 2008 (Rest of Region) · Paper 2 · Question 1(b)(ii)

Table 1 presents data on cumulative oxygen uptake (cm³) by germinating and dry peas at 10 °C and 25 °C over 30 minutes.

Plot the results for the germinating peas at 25 °C on the graph grid provided.

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Other parts of this question

  1. 1(a)Explain how the respirometer apparatus is used to measure the rate of oxygen uptake by organisms.[6 marks]
  2. 1(b)(i)Suggest a control for this experiment.[1 mark]
  3. 1(b)(iii)Calculate the rate of oxygen consumption for germinating peas at BOTH temperatures (10 °C and 25 °C) using the time interval between 10 and 20 minutes.[2 marks]
  4. 1(b)(iv)a)Comment on the differences in oxygen consumption observed between germinating peas at 10 °C and 25 °C.[1 mark]
  5. 1(b)(iv)b)Comment on the differences in oxygen consumption observed between germinating and dry peas.[1 mark]

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