As light intensity increases, so does the rate since light provides the energy for the reaction, Light is no longer affecting photosynthesis so either carbon dioxide or temperature is a limiting factor, As carbon dioxide concentration increases the rate of photosynthesis increases. The gas is a limiting factor at this point., Either temperature or light intensity is a limiting factor at this point, As temperature increases enzymes have more frequent collisions with their substrates that speed up photosynthesis, This is the optimum temperature for photosynthesis, High temperatures are still a limiting factor and here they decrease the rate of photosynthesis as some enzymes are now denatured.

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