What is compensation point?

Asked by ray.monika | 25th May, 2015, 09:07: PM

Expert Answer:

The amount of light intensity on the light curve where the rate of respiration is equal to the rate of photosynthesis is called compensation point. At this point, the uptake of CO2 through photosynthetic pathway is exactly equivalent to the respiratory release of CO2, and the uptake of O2 by respiration is exactly equivalent to the photosynthetic release of O2. With further increase in light intensity, the plant begins to photosynthesize more than it respires and the sugars produced get stored as starch. At the compensation point, the net carbon dioxide assimilation is zero. Leaves release CO2 by photorespiration and day respiration, but CO2 is also converted into carbohydrate by photosynthesis. The compensation point for light intensity varies according to the type of plant, but it is typically 40 to 60 W/m2 for sunlight. 

Answered by Sheetal Kolte | 26th May, 2015, 10:54: AM