What is root pressure? How is it useful to the plant? (AS1)
a. The pressure exerted by the water molecules and absorbed by root hairs is called root pressure.
b. Root pressure can push water upwards for few meters. This is enough to supply water from roots to leaves in herbaceous plants such as tomato, mustard, cabbage, small bushy plants.
c. The cell membrane of root hair is a semipermeable membrane and separates the cell sap (contents of the vacuole) from the water in the soil.
d. As a result, water flows from the soil into the cell sap from root hairs. Thus, roots absorb water and salts from the soil.
e. The absorbed water and salts will move to the next cell by osmosis.
f. Root pressure develops due to the absorption of water by roots and pushes the water upwards by few meters and is enough to supply water to leaves in small plants and small trees.
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