What Moves Phloem Sap Within a Plant

Question

What moves phloem sap within a plant?
A)cohesion-tension mechanism
B)gravity pulls the phloem sap down
C)pressure-flow mechanism
D)transpiration

Accepted Answer

The pressure-flow mechanism, also known as the mass flow hypothesis, explains the movement of phloem sap from sources (where sugars are produced) to sinks (where sugars are used or stored) due to pressure differences.