These are the factors.
Light
At first as light intensity is increased, the rate of photosynthesis is increased but then it plateaus because of limiting factors. Without enough light, a plant cannot photosynthesise very quickly, even if there is plenty of water and carbon dioxide. Increasing the light intensity will boost the speed of photosynthesis.
CO2
Temperature
Water
Humidity
Sometimes photosynthesis is limited by the concentration of carbon dioxide in the air. Even if there is plenty of light, a plant cannot photosynthesise if there is insufficient carbon dioxide.
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