What contributes to the upward movement of water in a xylem vessel of a plant?
1. cohesion of water molecules by hydrogen bonding
2. adhesion of water molecules to the cellulose walls of xylem vessels by hydrogen bonding
3. removal of water from xylem vessels in a leaf reduces the hydrostatic pressure in the xylem
1, 2 and 3
2 )
1 and 2 only
3 )
1 and 3 only
4 )
2 and 3 only
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