Because photosynthesis wouldn't happen, if it's too hot then it would become denatured and too cold = cells would stop working
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the photosynthesis would not happen if it is too hot then it would become too cold and denatured, then will result in cells would stop working.
Since the light-dependent reaction of photosynthesis is not affected by changes in temperature than the whole rate increases. If the temperature goes above optimum the rates begin to decrease. The enzyme is being denatured until the time it stops.
1. No light = no reaction can be made. That means the plant wouldn't intake any CO2 anyway.
2. When very hot the enzymes will denature (plant dead) or when cold, the activation energy will not be there. So once again, it will not respond to light as it is not its primary concern.
Light intensity is not dependent on temperature, with that said, plants (assuming that is what were talking about) would dehydrate faster at a higher temperature (unless they had mechanisms to cope e.g. C4 and CAM plants) with the same light intensity.