The phenomenon responsible for maintaining the upward movement of water through vessels in a tree is .

Cohesion

Explanation:

Cohesion tension theory of water movement up the tree vessels

 Cohesion is the term used to describe the binding forces present in water molecules through hydrogen bonds as such the water molecules have considerable tensile strenghth allowing them to be pulled up into the leaves of plants through the tree vessels without breakage as longitutudinal stress are placed on the water as it is pulled up

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the answer to this question is 3.