Light compensation point is the point where:

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(B) The light compensation point is the specific light intensity at which the rate of photosynthesis exactly equals the rate of respiration. At this p

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Gaseous exchange does not occur in photosynthesis

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(B) The light compensation point is the specific light intensity at which the rate of photosynthesis exactly equals the rate of respiration. At this point,the amount of $CO_2$ fixed by photosynthesis is equal to the amount of $CO_2$ released by respiration,and the amount of $O_2$ consumed by respiration is equal to the amount of $O_2$ produced by photosynthesis. Consequently,there is no net gaseous exchange with the external environment.

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