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3 marksPhotosynthesis and ATP Synthesis

CAPE Biology Unit 2 · 2003 · Paper 1 · Question 1(a)

An experiment examining the source of oxygen in photosynthesis using isotopic labelling. Plant A was supplied with normal carbon dioxide and water labelled with radioactive oxygen atoms, while Plant B was supplied with carbon dioxide labelled with radioactive oxygen atoms and normal water.

Predict, with reasons, which photosynthetic product of Plant A will contain radioactivity.

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Other parts of this question

  1. 1(b)Predict, with reasons, which photosynthetic product of Plant B will contain radioactivity.[3 marks]
  2. 1(c)(i)From the graph in Figure 1, describe how the amount of ATP generated by the plant varies with increasing light intensity.[2 marks]
  3. 1(c)(ii)State ONE reason why ATP production does not increase indefinitely.[2 marks]

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