Explain pressure flow hypothesis of translocation of sugars in plants.

(1) As per pressure flow hypothesis, preparation of food takes place inside the plant in the form of glucose.

(2) The prepared food converted into sucrose before transporting it to the source cell

(3) Hydrostatic pressure increases due to movement of water into adjacent phloem.

(4) Movement of sucrose takes place through the phloem sieve cells.

(5) The sucrose which is already present in the sink region is converted into starch or cellulose, which reduces the hydrostatic pressure in the sink cells. Hence, due to the difference in pressure between the source and sink translocation of sugar takes place from one place to other and removal of sucrose takes place by active transport.