Which phenomenon limits photosynthetic rate when leaf intercellular CO2 concentrations decline significantly?

💡 Explanation

When CO2 concentration declines, rubisco's carboxylation rate, crucial for carbon fixation, becomes limited because the enzyme saturates, reaching its maximum velocity (Vmax), reducing overall photosynthetic output. Therefore rubisco carboxylation rate limits the system, rather than photorespiration inhibition, stomatal closure, or chlorophyll inhibition, which depend on different limiting factors.

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