Which one of the following statements about transport of nutrients in phloem is false?
A) Solute particles can be actively transported into phloem at the source.
B) Companion cells control the rate and direction of movement of phloem sap.
C) Differences in osmotic concentration at the source and sink cause a hydrostatic pressure gradient to be formed.
D) A sink is that part of the plant where a particular solute is consumed or stored.
E) A sink may be located anywhere in the plant.
