BRAINCAKEPhloem Unloading
Sucrose is actively transported out of the sieve tubes into the sink cells.
This creates a high water potential at the sink.
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Key terms in this lesson
- osmosis
- The net movement of water molecules from a region of higher water potential to a region of lower water potential through a selectively permeable membrane.
- water potential
- The pressure created by water molecules, a measure of the tendency of water to move out of a solution; pure water has a water potential of zero and solutes make it more negative.
- xylem
- Plant vascular tissue, made of dead, lignified tubular cells, that transports water and mineral ions from the roots to the leaves.
- phloem
- Plant vascular tissue, made of sieve tube elements and companion cells, that transports organic solutes such as sucrose around the plant.
More in Mass Transport in Plants
- Movement of Water Through the Stomata
- Translocation
- Phloem Loading
- Mass Flow through Sieve Tube Elements
- Mass Flow Model
- Ringing Experiments
- Tracer Experiments
- Evidence for Translocation in Phloem
All 15 lessons in Mass Transport in Plants · All AQA AS-level Biology topics