Which of the Following Are Important Components of Long-Distance Transport

Multiple Choice

Which of the following are important components of long-distance transport process in xylem?
I. the cohesion of water molecules
II. a negative water potential
III. the active transport of solutes
IV. bulk flow from source to sink

A) I and II only
B) 1 and III only
C) I, III, and IV only
D) I, II, III, and IV