Calculation of molar mass of glucose (C6H12O6) The molar mass of glucose can be calculated from the molar masses of individual atoms present in it. From the molecular formula, C6H12O6, one can find there are 6 carbon atoms, 12 hydrogen atoms and 6 oxygen atoms in one molecule of glucose.
Guard cells are cells surrounding each stoma. They help to regulate the rate of transpiration by opening and closing the stomata.
Plants can lose a lot of water via evaporation through the stomata, and open stomata also provide pathogens with a means for entering the plant. Two cells border each stoma (which is just a tiny hole in the leaf). These cells are called guard cells. Guard cells use turgor pressure to regulate the opening of stomata. When the plant wants to open its stomata, the guard cells take up ions (mostly K+ and Cl-) and sugars through ion channels and pumps. Because the solute concentration is now high inside the guard cells, water moves in and the cells expand. This expansion causes the guard cells to expand and puff out, opening the pore.