What is responsible for the movement of water up xylem vessels in plants?
1 )
active loading of water against the water potential gradient in the roots and osmosis in the vessels
2 )
increasing water potential at the top of xylem vessels, and osmosis in the roots
decreasing water potential at the top of the xylem vessels, with cohesion of water in the vessels
4 )
translocation in the leaves, with capillarity in the xylem vessels
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