Which outcome occurs when a C4 plant transitions to conditions favoring C3 photosynthesis due to reduced photorespiration?

💡 Explanation

When a C4 plant experiences conditions where photorespiration is reduced, the C4 pathway, optimized for concentrating CO₂, becomes less advantageous because its cost outweighs benefits, leading to decreased ATP efficiency. Therefore, decreased ATP production occurs, rather than WUE increase, RuBisCO selectivity increases, or mesophyll depletion, as C3 solely is more thermodynamically beneficial.

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