Question

How can the absence of light affect photosynthesis

Answer 1

As light intensity increases, the rate of photosynthesis will increase as long as other factors are in adequate supply. As the rate increases, eventually another factor will come into short supply. The graph below shows the effect of low carbon dioxide concentration.

Answer 2

Light intensity. Without enough light, a plant cannot photosynthesise very quickly - even if there is plenty of water and carbon dioxide. Increasing thelight intensity increases the rate ofphotosynthesis, until some other factor - a limiting factor - becomes in short supply.