How osmotic pressure affects the rate of transpiration?
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Explanation:
Root pressure occurs in the xylem of some vascular plants when the soil moisture level is high either at night or when transpiration is low during the day.
When transpiration is high, xylem sap is usually under tension, rather than under pressure, due to transpirational pull.
At night in some plants, root pressure causes guttation or exudation of drops of xylem sap from the tips or edges of leaves.
Root pressure is studied by removing the shoot of a plant near the soil level.
Xylem sap will exude from the cut stem for hours or days due to root pressure. If a pressure gauge is attached to the cut stem, the root pressure can be measured.
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