- Factors : Light Intensity -

• Without enough light, a plant cannot photosynthesise very quickly - even if there is plenty of water and carbon dioxide
• Increasing the light intensity increases the rate of photosynthesis, until some other factor - a limiting factor - becomes in short supply
• The rate of photosynthesis is directly proportional to the light intensity until another factor becomes limiting
• At very high light intensities, photosynthesis is slowed, but these light intensities do not occur in nature
• Graph showing light intensity effect on the rate of photosynthesis