From active hydathodes,the water comes out by

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(C) The process of guttation involves the exudation of liquid water from the tips or margins of leaves through specialized structures called hydathode

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By root pressure

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(C) The process of guttation involves the exudation of liquid water from the tips or margins of leaves through specialized structures called hydathodes.This phenomenon occurs due to the development of a positive hydrostatic pressure,known as $root \ pressure$,in the xylem vessels at the vein endings.This $root \ pressure$ forces the liquid water out through the hydathodes,especially when transpiration is low and water absorption is high.

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