Final answer:
The cohesive nature of water is key to its transportation in plants, with root pressure playing only a minor role. Water transport is a largely passive process involving bulk flow driven by tension differences created by processes like transpiration.
Step-by-step explanation:
The correct statement about water transport in plants is that the cohesive nature of water is central to water movement in a plant. Root pressure can sometimes contribute to moving water through the xylem, but this pressure alone is usually not sufficient to drive the movement of xylem sap throughout the entire height of a tree. Instead, the primary mechanism for water transport is the creation of a tension difference in the xylem, largely resulting from the process of transpiration the loss of water vapor from the leaves and stems of plants.
Bulk flow is indeed a mechanism by which water and other solutes are transported, particularly through the xylem and phloem, where it is much more effective over long distances than diffusion. Water transport in xylem is a passive process driven by tension and does not require active transport because water moves from an area of higher total water potential to an area of lower total water potential.