Which outcome occurs when high atmospheric CO2 levels override typical stomatal control mechanisms in C3 plants?

💡 Explanation

When CO2 concentration rises above normal levels, stomata close more frequently through abscisic acid signaling even under non-stress conditions, decreasing transpiration because the plant prioritizes water conservation, which can lead to leaf overheating. Therefore reduced transpiration leading to overheating occurs, rather than photorespiration, nitrogen uptake change or root growth boost, mechanisms each having different triggers.

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