Which outcome accelerates when excessive atmospheric CO₂ closes plant stomata undergoing C4 photosynthesis?

💡 Explanation

When excess CO₂ causes stomatal closure, the C4 pathway efficiency drops because CO₂ entry decreases and less carbon is fixed, disrupting the NADPH/ATP balance, causing increase in reactive oxygen species and oxidative stress. Therefore oxidative stress results, rather than suppression, reduction or improvement which rely on open stomata and efficient CO₂ transport.

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