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biology 0610printed 100 · PDF 100
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Pathway of water
Water moves in plants through roots through osmosis.
Then the water travels through the cortex, through many root cells by osmosis.
Eventually it reaches the middle of the root where xylem is present.
Root hair cell - Root cortex cell - leaf mesophyll cells
The water then travels up the xylem vessel due to the difference in pressure at
the top.
Up in the leaves cells some of the water is used for photosynthesis and some
of it evaporates from the leaf through stomata.
Transpiration
It is the loss of water vapour from the plant
Mostly happens through stomata
As water vapour diffuses out of the leaf cells the water potential inside the cell
decreases.