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Photosynthesis Help

  1. Oct 14, 2007 #1
    [​IMG]

    This graph shows changes that occur in the amounts of ribulose 1,5 - bisphosphate (RuBP) and phosphoglyceric acid (PGA) in leaf mesophyll cells during a six minute interval of sunlight with the concentration of carbon dioxide being suddenly diminished at the middle of the interval.

    Can anyone help me understand whats going on this graph?
     
  2. jcsd
  3. Oct 15, 2007 #2

    jim mcnamara

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    Well, to start with PGA concentrations go down. Can you see why? ie., where does PGA come from? It must have something to do with carbon fixation, right? Why? because you just lost your fixable carbon source when the CO2 levels go to almost zero.

    RuBP is used for what? Does it seem like RuBP must be used up in the process that creates PGA? Or not? Hint: Calvin's cycle
     
  4. Oct 15, 2007 #3

    jim mcnamara

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  5. Jan 4, 2008 #4
    Carbon Dioxide is a limiting factor, so the rate of photosynthesis will vary.
     
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