What is the structure and function of guard cells?
Guard cells are cells surrounding each stoma. They help to regulate the rate of transpiration by opening and closing the stomata. To understand how they function, study the following figures. As you look at the figures, keep in mind that an increase in solute concentration lowers the water potential of the solution, and that water moves from a region with higher water potential to a region of lower water potential. ….http://www.phschool.com/science/biology_… This is a pretty good explanation. The Wikipedia link overdoes the explanation in some areas and glosses over others, but it’s still a useful article.
