Which outcome occurs when high oxygen concentration competitively inhibits ribulose-1,5-bisphosphate carboxylase/oxygenase (rubisco) in plant cells?

💡 Explanation

When high oxygen concentration competitively inhibits rubisco, photorespiration rate increases because rubisco binds oxygen instead of carbon dioxide, leading to energy waste. Therefore, photorespiration results, rather than Calvin cycle increase, which requires CO2, increased conductance, or chlorophyll synthesis.

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