The conduction of water from root hair to root xylem is

As root hairs come in contact with water, they automatically absorb water in apoplast. This is a physical process just like water is soaked up by a piece of paper or cotton. Like that water reaches upto the layer of endodermis. The endodermal cells have casparian strips, which makes it impossible for water to move further through apoplastic pathway. At the endodermis, water passes through symplast. Once endodermis is crossed, water again is free to follow apoplast or symplast pathway, till it reaches xylem.