Sugary sap flows through phloem because of pressure changes between sugar sources and sugar sinks. There is always a concentration of sugars at a sugar source.

Sugary sap flows through phloem because of pressure changes between sugar sources and sugar sinks. There is always a higher concentration of sugars at a sugar source.

Explanation:

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The transport of sugar in the plant occurs in the sieve vessels of the phloem. This transport is due to the differences in hydrostatic pressure between the different compartments of the plant, as discussed in the pressure flow-hypothesis.

According to the hypothesis, sugar is more concentrated at the source and less concentrated in the areas where the sugar will be used, there being a difference or gradient of concentration.

The higher concentration of sugars in the source attracts water, which enters by osmosis, and produces an increase in hydrostatic pressure, a factor that triggers the movement of sugar by phloem.

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Pressure flow-hypothesis link

Sugary sap flows through phloem because of pressure changes between sugar sources and sugar sinks. There is always a concentration of sugars at a sugar source.

Explanation:

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