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.
Turgor in guard cells results from the active uptake of potassium (K ; ), chloride (Cl : ), and malate. As solute concentration increases, water potential decreases in the guard cells, and water enters osmotically. As a result, these cells accumulate water and become turgid, opening the stomata (figure 38.12).