One of the following statements is not true. decide which one is false and explain your answer?

TRUE: The guard cells of desert plants, specifically Crulacean Acid Metabolism (CAM) plants remain closed during the daytime and open at night to conserve water. Also true is the following statement: The guard cell of non-desert plants open during the daytime to absorb CO2 for fixation using the energy of photosynthesis. They remain closed at night, when photosynthesis is inactive.