Question

After sugars are loaded into the phloem, what force moves them toward sinks?

a. Water diffuses into the phloem and the increased pressure moves the fluid outward through the phloem.

b. Sugars diffuse between the cells; there is no positive or negative pressure in the phloem.

c. Sugars are slightly polar molecules, and are attracted to the slight charge at the cell surfaces of the phloem.

d. Negative pressure develops as sugars are removed from the fluid by the sink cells.