The fact that there is one continuous column of water within the xylem is best explained by

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Quizplus · Accepted Answer

The force of cohesion, which is the tendency of water molecules to stick together through hydrogen bonding, allows for the creation of a continuous water column within the xylem. This is because as water is pulled up from roots to leaves via transpiration, the cohesive forces between water molecules keep the column intact. Differences in pressure potential and the force of gravity may play a role in water movement, but they do not explain the consistent, unbroken column of water within the xylem. Osmosis also does not play a direct role in water movement within the xylem.

The Fact That There Is One Continuous Column of Water