BRAINCAKEMass Flow through Sieve Tube Elements
Sucrose loaded into the sieve tubes causes the sieve tubes to have a lower water potential.
Water moves from xylem vessels into the sieve tubes down the water potential gradient by osmosis.
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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.
- active transport
- The movement of molecules or ions across a membrane from a region of lower to higher concentration, against the concentration gradient, using ATP and carrier proteins.
- xylem
- Plant vascular tissue, made of dead, lignified tubular cells, that transports water and mineral ions from the roots to the leaves.
More in Mass Transport in Plants
- Movement of Water Across the Leaf
- Movement of Water Through the Stomata
- Translocation
- Phloem Loading
- Mass Flow Model
- Phloem Unloading
- Ringing Experiments
- Tracer Experiments
All 15 lessons in Mass Transport in Plants · All AQA AS-level Biology topics