Limiting factor graphs

Limiting factor graphs

1. Not enough light slows down the rate of photosynthesis.

   • Light provides the energy for photosynthesis.
   • As the light level is raised, the rate of photosynthesis increases steadily - but only up to a certain point.
   • Beyond that point, it wont make any difference because then it will either be temperature or the level of carbon dioxide which is the limiting factor.
   • Here is a graph showing the rate of photosynthesis against the light intensity - Light is the limiting factor.

2. Too little carbon dioxide also slows down the rate of photosynthesis.

   • Carbon dioxide is one of the raw materials needed for photosynthesis.
   • As with light intensity the amount of carbon dioxide will only increase the rate of photosynthesis up to a point.
     • After the graph flattens showing that carbon dioxide levels are no longer the limiting factor.
   • As long as light and carbon dioxide levels are in plentiful supply then the factor limiting photosynthesis must be temperature.
   • Here is a graph showing the rate of photosynthesis against the amount of carbon dioxide - amount of carbon dioxide is the limiting factor.