Understand Changes in Photosynthesis Graph

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The graph illustrates the changes in ribulose 1,5-bisphosphate (RuBP) and phosphoglyceric acid (PGA) in leaf mesophyll cells during a six-minute sunlight interval, highlighting a significant drop in CO2 concentration. As CO2 levels decrease, PGA concentrations also decline due to its reliance on carbon fixation, which is directly affected by the availability of CO2. RuBP plays a crucial role in the Calvin cycle, where it is consumed to produce PGA, indicating that RuBP levels may also be impacted by the drop in CO2. The discussion emphasizes that carbon dioxide is a limiting factor in photosynthesis, affecting the overall rate of the process. Understanding these dynamics is essential for grasping the intricacies of photosynthesis and its dependence on carbon availability.
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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 what's going on this graph?
 
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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
 
Here is what you need to read if none of the above makes sense.
http://www.rpi.edu/dept/bcbp/molbiochem/MBWeb/mb2/part1/dark.htm
 
Carbon Dioxide is a limiting factor, so the rate of photosynthesis will vary.
 
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