BRAINCAKEWater in Plant Transport Systems
Plants move water from the roots to the leaves through xylem vessels: long, hollow tubes made of dead cells with no end walls, whose walls are strengthened with lignin. The upward flow of water in the xylem is the transpiration stream.
Cohesion–tension theory. Water evaporates from the surfaces of mesophyll cells into the air spaces of the leaf, and water vapour diffuses out through the stomata. This loss is transpiration. Water moves into the mesophyll cells from the xylem to replace it.
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Key terms in this lesson
- phloem
- Living plant tissue made of sieve tube elements and companion cells that transports the products of photosynthesis, mainly sucrose, around a plant.
More in Chemistry for Life
- Covalent Bonding
- Important Anions
- Important Cations
- Water
- Water as a Polar Solvent
- Water as a Transport Medium
- Water as a Habitat
- Water in Hydraulic Mechanisms
All 10 lessons in Chemistry for Life · All Edexcel AS-level Biology topics