Which inefficiency arises when photorespiration outcompetes the carboxylation of RuBP by rubisco?

💡 Explanation

When photorespiration outcompetes carboxylation, oxygen binds to RuBP instead of carbon dioxide because rubisco's active site favours oxygen at high O₂/CO₂ ratios, reducing the production of 3-PGA, decreasing overall carbohydrate synthesis. Therefore, decreased carbohydrate synthesis results, rather than increased ATP, reduced water loss or enhanced nitrogen fixation which are unrelated.

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