What is guttation ? what is responsible for gutttation ?
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Guttation is the secretion or exudation of drops of xylem sap on the tips or edges of leaves. Some vascular plants, like grasses, exhibit this behaviour. When water accumulates in a plant, it creates a slight root pressure. This root pressure causes the exudation. It mostly happens when transpiration is suppressed due to high relative humidity, such as during the night.
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The answer is...
The loss of water in the liquid phase from special openings called hydathodes due to root pressure is called guttation.
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