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During photosynthesis, there is a point at which the light intensity is such that the rate of photosynthesis exactly matches the rate of respiration called the compensation point. What this means is that the plant can essentially utilize the $\ce{CO_2}$ produced during respiration for photosynthesis and the $\ce{O_2}$ produced during photosynthesis for respiration. But, does this mean, that a plant which has been given an initial supply of $\ce{CO_2}$ and $\ce{O_2}$ and then subsequently put into another gas (still in compensation point light intensity), say nitrogen, can survive indefinitely? (or as long as it's life span).

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If the plant is growing the system will fall out of equilibrium due to more carbon going into biomass than oxygen.

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  • $\begingroup$ Another concern might be that depending on how much neutral nitrogen there is, the oxygen/CO2 might diffuse into the nitrogen, lowering the available amount. $\endgroup$ – Resonating Aug 12 '13 at 15:55

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