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3 marksPhotosynthesis and ATP Synthesis

CAPE Biology Unit 2 · 2014 · Paper 2 · Question 1(b)(ii)

Leaves were exposed to two atmospheric carbon dioxide concentrations (325 ppm and 1935 ppm) across different temperatures, and net photosynthetic rates were measured as shown in Figure 2.

With reference to data presented in Figure 2, explain the effect of the increase in CO2 concentration on the rate of photosynthesis, taking into consideration the temperature of the leaf.

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Other parts of this question

  1. 1(a)(i)Identify the structures labelled A, B, C and D in Figure 1.[4 marks]
  2. 1(a)(ii)Using an arrow labelled X on Figure 1, indicate the site of the Krebs cycle.[1 mark]
  3. 1(b)(i)Describe the relationship between leaf temperature and net photosynthetic rate at 1935 ppm CO2.[3 marks]
  4. 1(b)(iii)Briefly comment on how an understanding of temperature and carbon dioxide, as limiting factors of photosynthesis, may be used by farmers to increase crop yield…[4 marks]

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