According to the pressure-flow hypothesis, mechanism that causes the movement of phloem sap from sources to sink tissues is : water and sucrose go up the stem when they are present in the phloem.
<h3>What exactly is pressure-flow theory?</h3>
According to Ernst Münch's pressure flow hypothesis, the transport of sugars and other solutes through the phloem is driven by pressure differentials that are produced as a result of osmosis.
According to the pressure flow hypothesis, water with food molecules moves under pressure in the phloem. The pressure is caused by the differential in water concentration between the phloem solution and the neighboring xylem conduits of pure water.
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