Three factors can limit photosynthesis from going any faster. These are light intensity, carbon dioxide concentration and temperature.
Without enough light a plant cannot photosynthesise very fast, even if there is plenty of water and carbon dioxide. Increasing the light intensity will make photosynthesis faster.
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.
If it gets too cold the rate of photosynthesis will decrease. Plants cannot photosynthesise if it gets too hot.
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