Question

How is water transported by xylem at day and night 0th?

Answer 1

At night in some plants, root pressure causes guttation or exudation of drops of xylem sap from the tips or edges of leaves. ... Without transpiration to carry the ions up the stem, they accumulate in the root xylem and lower the water potential. Water then diffuses from the soil into the root xylem due to osmosis.

Answer 2

In the day, water is transported by Transpiration- pull theory..

And at night, By the process of osmosis in root and soil, called Root pressure theory.