Which effect arises when elevated ozone concentrations inhibit rubisco carboxylation in plant mesophyll cells?

💡 Explanation

When ozone damages mesophyll cells, rubisco's carboxylation activity decreases because the ozone directly interferes with the enzyme's active site, thereby reducing carbon fixation. Therefore a reduction in photosynthetic carbon fixation results, rather than increased photorespiration, nitrogen assimilation, or improvements of water usage which would involve alternate biochemical pathways.

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