12.Guard cells help in A. Fighting against infection B. Protection against grazing C. Transpiration D. Guttation
Option C. The opening and closing of stomata are essential for respiration as well as transpiration. • The guard cells become turgid and swell in size as water enters them due to a difference in potential, which causes the opening of the stomata. • As the solute declines, the water drains out of the guard cells, thus closing the stomata. Hence, the guard cells play an important role in transpiration.
