Which outcome occurs when C4 plants experience high nitrogen limitation?

💡 Explanation

When C4 plants are nitrogen-limited, decreased synthesis of Rubisco, a nitrogen-rich enzyme essential for carbon fixation in bundle sheath cells, occurs because nitrogen is unavailable for Rubisco production, leading to a reduction in carbon fixation rates. Therefore, carbon fixation decreases, rather than increased photorespiration, enhanced water efficiency, or elevated oxygen production, since those responses involve different regulation mechanisms.

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• Which effect occurs when high oxygen concentration competitively inhibits Rubisco in C3 plants?
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