BRAINCAKEMovement of Water Up the Stem
The movement of water up the stem is through cohesion-tension. Water molecules are bonded together by hydrogen bonds. This is called cohesion.
When one water molecule evaporates from a mesophyll cell it pulls the chain of water molecules up the xylem. The next molecule evaporates and pulls the chain of water molecules up further. As a results there is a continuous pull of the column of water molecules up the xylem.
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Key terms in this lesson
- hydrogen bond
- A weak electrostatic attraction between a slightly positive hydrogen atom on one polar molecule and a slightly negative atom, such as oxygen or nitrogen, on another.
- xylem
- Plant vascular tissue, made of dead, lignified tubular cells, that transports water and mineral ions from the roots to the leaves.
- transpiration
- The evaporation of water from the leaves of a plant, which pulls water up through the xylem.
More in Mass Transport in Plants
- Specialised Plant Cells
- Transpiration
- Movement of Water into the Root Hair Cells
- Movement of Water across the Roots
- Movement of Water Across the Leaf
- Movement of Water Through the Stomata
- Translocation
- Phloem Loading
All 15 lessons in Mass Transport in Plants · All AQA AS-level Biology topics