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Transpiration is the evaporation of water from plant leaves.

Transpiration is controlled by
Select Option xylempalisade mesophyll cellsguard cells
on the
Select Option upper sideedge underside
of the leaf. The mechanism by which transpiration occurs involves the opening of a pore (stoma) between these cells. To open the stoma
Select Option sodiumpotassiummagnesium
must enter the cells, followed by
Select Option protonselectronswater
causing the cells to
Select Option swellshrinkcurl
. When the stoma opens, water can leave the leaf.
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