Factors affecting the rate of photosynthesis

• The rate of photosynthesis depends on: • the energy available from light • the concentration of carbon dioxide in the air • the temperature.
• (HT only) The rate of photosynthesis may be limited by: • low temperature • shortage of carbon dioxide • shortage of light. (HT only) Increasing any one of the factors speeds up photosynthesis until the rate is limited by the factor which is in shortest supply.