Question: where does the first stage of photosynthesis take place

title: Light-independent reactions
text: RuBisCO also reacts competitively with O instead of CO in photorespiration . The rate of photorespiration is higher at high temperatures . Photorespiration turns RuBP into 3 - PGA and 2 - phosphoglycolate , a 2 - carbon molecule that can be converted via glycolate and glyoxalate to glycine . Via the glycine cleavage system and tetrahydrofolate , two glycines are converted into serine + CO . Serine can be converted back to 3 - phosphoglycerate . Thus , only 3 of 4 carbons from two phosphoglycolates can be converted back to 3 - PGA . It can be seen that photorespiration has very negative consequences for the plant , because , rather than fixing CO , this process leads to loss of CO . C4 carbon fixation evolved to circumvent photorespiration , but can occur only in certain plants native to very warm or tropical climates -- corn , for example .