The rate of Photosynthesis can be limited by:
- Light Intensity
- Carbon dioxide
- Temperature
Light Intensity - As the light intensity increases, the rate of photosynthesis increases steadily but only up to a certain point. After this, the rate no longer increases as either the temperature or carbon dioxide level is now a limiting factor not light.
Carbon Dioxide - Like light intensity, the amount of carbon dioxide will only increase the rate of photosynthesis up to a point. The graph flattens out as the rate no longer increases therefore carbon dioxide is no longer a limiting factor. If there is a good supply of light and carbon dioxide then temperature must be the limiting factor.
Temperature - The temperature has to be just right as if it's too low then the enzymes needed will work slower. If it is too hot then the enzymes will become denatured. This would happen at around 45 degrees. If this happens, photosynthesis stops.
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