At present the most widely accepted theory for movement of sugars in the phloem is called the

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The pressure-flow hypothesis is the most widely accepted theory for the movement of sugars in the phloem. It explains how sugars are actively transported into sieve tubes, creating a high osmotic pressure that drives the flow of water and sugars from sources (where sugars are produced) to sinks (where sugars are used or stored).

At Present the Most Widely Accepted Theory for Movement of Sugars