What causes stomata to open by facilitating the movement of K+ ions into guard cells from adjacent epidermal cells?

Explanation

Stomatal opening is triggered by the active transport of potassium ions (K+) into guard cells, which requires energy. This influx of K+ ions lowers the water potential inside the guard cells, leading to water intake by osmosis and causing the stomata to open. Passive diffusion or osmosis alone do not account for the initial accumulation of K+ ions.