Question

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 atmosphere vapour pressure does not favour transpiration.

III. Forces generated by transpiration crate pressure sufficient to lift a xylem sized water column over 130 meters high.

IV. Under low humidity, optimum temperature, guard cells are turgid, most soil, transpiration would be high.

Which of the above points is correct –

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

Answer 1

Answer: (D)

Only IV is correct