why is RQ value zero at compensation point?

compensation point is a point at which co2fixation in photosynthesis is equal to volume of co2 released in respiration

so net co2 is zero and hence rq is zero

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The amount of CO2 taken up in the photosynthesis is equal to the amount of CO2 released by respiration. The amount of O2 taken up for respiration is equal to the amount of O2 released by photosynthesis. The net value of carbon dioxide and oxygen produced or assimilated is zero at compensation point in plants.
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