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Function of xylem
Transport water and minerals from roots to leaves (one way only).
Function of phloem
Transport sugars (dissolved food) up and down the plant.
Definition of transpiration
Loss of water vapour from the leaves through the stomata.
Factors affecting transpiration rate
Light intensity, temperature, humidity, air flow.
Adaptations to reduce water loss
Waxy cuticle, stomata closing, small surface area of leaves (in hot environments).
Role of root hair cells
Absorb water and minerals, adapted with large surface area.