Which is the driving force for the process of passive absorption of water in roots?

Passive absorption of water by roots is driven by the transpiration pull created in the leaves. As water evaporates from the stomata during transpiration, a negative pressure or tension develops in the xylem vessels of the leaves. This tension is transmitted downwards through the continuous water column in the xylem to the roots, creating a suction force that pulls water from the soil into the root hairs. Root pressure, on the other hand, is an active process.

Answer: Transpiration pull in leaves