Guttation happens due to the development of

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(B) Guttation is the exudation of water droplets from the margins of leaves. It occurs when the rate of water absorption by roots is high and the rate

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Positive hydrostatic pressure in xylem

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(B) Guttation is the exudation of water droplets from the margins of leaves. It occurs when the rate of water absorption by roots is high and the rate of transpiration is very low (e.g.,at night or early morning). This leads to the accumulation of water in the xylem,creating a positive hydrostatic pressure known as $Root \ Pressure$. This pressure pushes the water out through specialized pores called hydathodes.

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