Which outcome results from increased photorespiration rates when stomatal closure restricts CO2 availability affecting enzyme rubisco?

💡 Explanation

When CO2 availability decreases due to stomatal closure, photorespiration increases because rubisco binds to O2 instead of CO2, leading to decreased carbon fixation and lower ATP production. Therefore photosynthetic efficiency lowers, rather than nitrogen fixation, chlorophyll increase, or growth acceleration, which require high CO2 levels.

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