In the pressure-flow model, the movement of nutrients through phloem is initiated when water moves from sieve-tube members into companion cells by osmosis, causing sugar in surrounding cells to be transported into sieve-tube members.

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In the pressure-flow model, the movement of nutrients through phloem is initiated when sugars are actively transported into sieve-tube members, causing water to move into sieve-tube members by osmosis, which increases the pressure and drives the flow of sap.

In the Pressure-Flow Model, the Movement of Nutrients Through Phloem