According to the pressure-flow hypothesis, sucrose and water flow up the stem in the phloem when roots are sources and leaves are sinks.
According to the Pressure-Flow Hypothesis, water containing food molecules passes through the phloem under pressure. The differential in water concentration between the solution in the phloem and the comparatively pure water in the neighboring xylem ducts causes the pressure.
the contents of the phloem experience a drop in osmotic pressure.
The comparatively clean water that is still in the phloem eventually escapes through osmosis or is drawn back into the neighboring xylem vessels by transpiration-pull. Thus, the phloem contents are forced up and down through the sieve elements by the pressure gradient between "source" (leaves) and "sink" (shoots and roots).
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