Mineral nutrients are absorbed actively by the root cells due to utilisation of adenosine triphosphate (ATP).
As a result, the concentration of ions (osmotica) in the xylem vessels is more in comparison to the soil water.
This requires the expenditure of metabolic energy released from the respiration of root cells.
It occurs in rapidly transpiring plants during the daytime, because of the opening of stomata and the atmospheric conditions.
The force for absorption of water is created at the leaf end i.e. the transpiration pull.
The continuity of the water column remains intact due to the cohesion between the molecules and it acts as a rope.
Absorption of water-Plants generally absorb capillary water from the soil through their roots.
This way a continuous diffusion pressure deficit is extended up to root hair and a suction force is developed.