1. Specialized potassium efflux channels participate in mediating release of potassium from guard cells . 2. Osmosis is also responsible for controlling the movement of guard cells . 3. They both consist of two large guard cells and pore, and are anomocytic. 4. Unlike most epidermal cells, the guard cells of plant stomata contain relatively well-developed chloroplasts. 5. The guard mother cell then makes one symmetrical division, which forms a pair of guard cells . 6. Malate is also synthesized by the carboxylation of phosphoenolpyruvate in the guard cells of plant leaves. 7. The guard cells swell, squeezing the stomata closed. 8. Chloroplasts are generally absent in epidermal cells, the exception being the guard cells of the stomata. 9. The epidermis of all aerial organs, but not roots, is covered with a guard cells have chloroplasts. 10. In daylight, plants using CAM close their guard cells and discharge malate that is subsequently transported into chloroplasts.
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