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6 marksPhotosynthesis and ATP Synthesis

CAPE Biology Unit 2 · 2017 · Paper 2 · Question 4(a)(ii)

Light intensity and carbon dioxide concentration are two factors that can limit the rate of photosynthesis.

Using your knowledge of the light-dependent and light-independent stages of photosynthesis, explain how light intensity and carbon dioxide act as limiting factors.

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  1. 4(a)(i)Discuss the concept of a limiting factor in photosynthesis.[4 marks]
  2. 4(b)Microorganisms are primarily responsible for most of the cycling of nitrogen in the biosphere. With reference to the main processes in the nitrogen cycle,…[5 marks]

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