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Evaporation of water at the surfaces of the spongy mesophyll cells in leaves, followed by loss of water vapour through the stomata.


• Transporting mineral ions

• Providing water to keep cells turgid in order to support the plant

• Providing water to leaf cells for photosynthesis

• Keeping the leaves cool by evaporation

Transpiration stream

The movement of water through a plant from the roots > through the xylem > to the leaves.

Wikipedia Results - Transpiration



[1] From Socratic - Xylem and Phloem


1. Plants take in water from their roots through the process of osmosis [from the soil (high water potential) into the root cells (lower water potential)].

2. Water is pulled up from the roots in the xylem as a column of water

- due to the tension caused by water loss from the leaves and the cohesion between the water molecules.

3. Stomata allow the uptake of CO2 for photosynthesis.

- When stomata are open, water evaporated from the spongy mesophyll can diffuse out of the leaf down the water potential gradient.

REMEMBER: As water leaves the plant, this creates a suctioning effect on the water in the xylem vessels by the leaves [1]

Factors affecting rate

BBC Bitesize - Transpiration


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