Question

The movement of sap within the xylem is increased by

I. Water movement into guard cell's vacuoles.
II. Humidity increases in the surrounding air.
III. Root endodermis prevents ions from entering the xylem.

• A. I only
• B. II only
• C. I and III
• D. II and III
• E. I, II, and III

Answer 1

Answer: (A)

I only

The upward movement of water from the root to aerial parts of the plant body is called ascent of sap or translocation of water. This movement takes place through the xylem due to positive root pressure and is increased by the movement of water into the guard cells vacuoles. Thus, the correct answer is option A.