crop plants: increasing CO2 and temperature

Question 1

what are the 3 main factors that limit the rate of photosynthesis?

Answer 1

temperature
light intensity
CO2 concentration

Question 2

how does temperature limit the rate of photosynthesis?

Answer 2

as temperature increases, the rate of photosynthesis increases as the reaction is controlled by enzymes
as the reaction is controlled by enzymes, the trend only continues up to a certain temperature beyond which the enzymes start to denature and the ROR decreases