Question

Formation of drops of water along leaf margin due to excessive root pressure is called ___.

Answer 1

Guttation is the exudation of drops of xylem sap on the tips or edges of leaves of some vascular plants, such as grasses. Guttation is not to be confused with dew, which condenses from the atmosphere onto the plant surface. At night in some plants, root pressure causes guttation or exudation of drops of xylem sap from the tips or edges of leaves. Water then diffuses from the soil into the root xylem due to osmosis. Root pressure is caused by this accumulation of water in the xylem pushing on the rigid cells.