How do sugars move from one sieve- tube cell to the next?

Question

Quizplus · Accepted Answer

Sugars move from one sieve-tube cell to the next by flowing along with water through perforations in the sieve plate. This process is called mass flow, and it occurs due to differences in pressure between source (where sugar is produced) and sink (where sugar is needed) cells. When pressure is high in the source cell, sugars and water flow into the sieve-tube element, and when pressure is lower in the sink cell, sugars and water flow out of the sieve-tube element and into the sink cell.

How Do Sugars Move from One Sieve- Tube Cell to the Next