Answer:
In xylem tissue,
vessels and tracheids of the roots, stem and leaves are inter- connected to
form a continuous system of water-conducting channels reaching all parts of the
plant. The root hairs are directly in contact with the film of water in between
the soil particles. Water gets into the root hairs by the process of diffusion.
At the roots, cells in contact with the soil actively take up ions. This creates
a difference in concentration of these ions between the root and the soil. Water,
therefore moves into the root from the soil. Hence, there is steady movement of
water into root xylem, creating a column of water that is steadily pushed
upwards. Also, water is lost from the aerial parts of plant (transpiration).
Evaporation of water molecules from the cells of the leaf creates a suction
which pulls water from the xylem cell of roots (the transpiration pull).
Thus,
transpiration helps in the absorption and upward movement of water and minerals
dissolved in it from roots to the leaves.
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