Transpiration
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The movement of water through a plant’s xylem occurs due to the
evaporation of water vapour from the leaves and the cohesive and adhesive properties exhibited by water molecules
adhesion meaning in water
Adhesion is the attraction of molecules of one kind for molecules of a different kind due to water being polar
cohesive meaning in water
refers to the attraction of molecules for other molecules of the same kind, and water molecules have strong cohesive forces thanks to their ability to form hydrogen bonds with one another. responsible for surface tension
…………is thedriving force behind the movement of water from the soil
The water potential gradient is the driving force behind the movement of water from the soil (high water potential) to the atmosphere (low water potential), via the plant’s cells Plants are constantly taking water in at their roots and losing water via the stomata (in the leaves), maintaining the water potential gradient between the roots and the leaves
Transpiration refers to the which is different than the transpiration stream which is what
loss of water vapour via the stomata by diffusion transpiration stream which is the movement of water from the roots to the leaves
Transpiration is important to the plant in the following ways
It provides a means of cooling the plant via evaporative cooling The transpiration stream is helpful in the uptake of mineral ions The turgor pressure of the cells (due to the presence of water as it moves up the plant) provides support to leaves (enabling an increased surface area of the leaf blade) and the stem of non-woody plants