Which cell are the responsible for movement of sugar as per mass flow hypothesis.

Explanation

Phloem sieve-tube elements have reduced cytoplasmic contents, and are connected by a sieve plate with pores that allow for pressure-driven bulk flow, or translocation, of phloem sap.The mass flow hypothesis is a theory that tells about how the sap flows through the phloem. This theory or hypothesis was first proposed in 1930 by German physiologist Ernst Munch. This theory tells us how simple sugar or a sugar that is highly concentrated organic sugar, is transported to other parts of a plant thus companion cells and sieve tubes are involved.