Chapter 34 - Transport in Plants - 34.3 - Stomata Control the Loss of Water and the Uptake of CO2 - 34.3 Recap - Learning Outcomes - Page 744: 1

Stomata can open or close depending on the turgor pressure of the plant cell. The turgor pressure relies on the fluctuations of potassium ions in guard cells. Under sunlight, a pigment absorbs blue light and forms a gradient that drives potassium ions inwards, making the water potential negative. Water immediately follows into the cell, increasing pressure potential and opening the stomata.

Stomata can open or close depending on the turgor pressure of the plant cell. The turgor pressure relies on the fluctuations of potassium ions in guard cells. Under sunlight, a pigment absorbs blue light and forms a gradient that drives potassium ions inwards, making the water potential negative. Water immediately follows into the cell, increasing pressure potential and opening the stomata.