Which outcome increases when a C4 plant's bundle sheath cells lack sufficient ATP synthase activity?

💡 Explanation

When ATP synthase activity is limiting, the regeneration of RuBP within mesophyll cells decreases due to insufficient ATP for the C3 cycle, which increases photorespiration to recapture carbon. Therefore, increased photorespiration results, rather than enhanced efficiency, transport, or lower oxygen due to disrupted ATP gradients.

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