Which photosynthetic constraint increases when photorespiration rate rises proportionally to oxygen concentration?

💡 Explanation

When photorespiration rate increases due to higher oxygen concentration, Rubisco's oxygenase activity increases, reducing its carboxylase function and lowering the binding affinity for CO2 because oxygen competitively inhibits carbon fixation. Therefore, options A results, rather than electron transport halting, decrease in conductance and reduction in chlorophyll synthesis, which are caused by other factors.

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