The rate of photosynthesis is commonly measured in one of two ways:
> Volume of oxygen released by plant
> Volume of carbon dioxide taken up by plant
When light is the limitng factor, the rate of photosynthesis is directly proportional to light intensity. As light intensity increases so does the volume of oxygen produced/carbon dioxide taken up to a point at which it is exactly balanced by the carbon dioxide produced/oxygen absorbed by cellular respiration. At this point = no net exchange of gases into/out of the plant = COMPENSATION POINT.
Further increases in light intensity will cause a proportional increase in rate of photosynthesis. However, a point will be reached where further increases in light intensity will have no effect on photosynthesis. .At this point some other factor is limiting the reaction.
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