Why is the pressure created by water moving into the root xylem unlikely to be enough to move water over significant heights in plants?

The pressure created by water moving into the root xylem, known as root pressure, is typically insufficient to move water over significant heights in plants due to various limitations. Firstly, root pressure generates only a relatively low pressure gradient, constrained by the height of the plant. Secondly, gravity opposes the upward movement of water, especially in tall plants where water needs to be transported considerable distances. Additionally, the primary mechanism driving long-distance water transport in plants is the cohesion-tension theory, where transpiration and cohesive forces pull water upward through the xylem. This mechanism is more effective at overcoming gravitational forces and facilitating water movement over tall heights. Therefore, while root pressure aids water uptake, it is not the principal force responsible for water transport over significant vertical distances in plants.