Hello, I'm doing OCR A Biology, this is A2 unit f214, about photosynthesis.
The specification states "describe the effect on the rate of photosynthesis, and on the levels of GP, RuBP and TP, of changing carbon dioxide concentration, light intensity and temperature".
I understand how the rate of photosynthesis and the concentration of GP, TP and RuBP are effected in terms of light intensity and carbon dioxide concentration.
What I need help on is how the concentration of the molecules are effected by temperature...
(Ignore temperatures above 25 degrees as I understand how photo-respiration will act to decreases rate of photosynthesis)...
If I increase the temperature, for example from 10 degrees to 20 degrees.....
The rate of photosynthesis increases, because molecules have more kinetic energy hence more successful collisions per unit time.
From this it is clear that TP concentration must increase.
Therefore GP concentration must have increased, correct?
Now, how is RuBP concentration effected?
RuBP concentration increases? --> if so, how can they all increase? then there is a gain of carbon, is there not?
RuBP concentration decreases? --> this is what was suggested at college, but is this correct? An explanation was not given.
Please explain this to me it has been annoying me for months now.
All the books on the topic seem to avoid answering this.
And it can't be the concentration of all TP, GP, and RuBP all stay the same, can it? Because TP concentration must increase as this is the product of the Calvin Cycle, to use to make glucose/etc.