Q. Which of the following facilities opening of stomatal aperture?
(a) Decrease in turgidity of guard cells.
(b) Radial orientation of cellulose microfibrils in the cell wall of guard cells
(c) Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells
(d) Contraction of outer wall of guard cells
Solution :
Correct option : C When the turgidity increases within the two guard cell, the thin outer walls bulge out and stomata opens. the microfibrils in guard cells are made up of cellulose oriented radially rather than longitudinally making it easier for the stomata to open. Thus, the correct answer is option C.