All the ATP needed in the dark reaction stage of photosynthesis comes from the ATP absorbed by light energy in the photoreaction. We should provide enough carbon dioxide after the light stops. C5 and CO2 continue to react to generate C3, but the ATP source disappears, so C3 accumulates and C3 increases. Temperature only slowed down the rate of photosynthesis and C3 formation, but the total C3 was still increasing. I hope it helps you. Q: Me too. I think so, but the answer has hardly changed. A: When the temperature is too low, the activity of the enzyme is very small, and the dark reaction is basically unchanged. Haha follow-up: the problem is that it only drops by 2 degrees, so it won't be carried out?