The influx of K⁺ ions into guard cells and efflux of H⁺ ions from guard cells leads to? 

Concept: The K+ particles are moved into the guard cells, by framing a thick slope. For this ingestion of K+ ions, it needs protons (H+) particles then, K+ particles are swapped for the protons H+. Assimilation of K+ particles is known as the influx of K+ ions into watch cells and the positive progress of H+ particles is known as the efflux of H+ particles.
This is a function that requires ATP energy and cytokinin (a plant chemical). Accordingly, guard cells enlarge and stomata open.