I. The immediate cause of stomatal movement is a change in the turgidity of guard cell
II. Higher vapour pressure in substomatal chamber and intercellular space with respect to atmospheric vapour pressure does not favour transpiration.
III. Forces generated by transpiration create pressure sufficient to lift a xylem sized water column over 130 meters high.
IV. Under low humidity, optimum temperature, guard cells are turgid, moist soil, transpiration would be high.
Which of the above points is correct -

Options

A. All
B. I, III and IV are correct
C. No one is correct
D. Only IV is correct

Answer

B