The movement of water through a plant is called the transpiration stream . This pathway begins at the root epidermis and continues symplastically and apoplastically to the endodermis. The path continues in the vascular cylinder of the root. The water and mineral solution accumulated by the endodermal transport proteins is conducted up the xylem of the root, the stem, and the leaf. In the leaf the solution coats the mesophyll cells apoplastically, evaporates into the gas spaces between the cells, and escapes the leaf through the stomata and into the atmosphere.
Transpiration is supported by four critical factors.
Root pressure pushes water up the xylem To be honest, the influx of water into roots is not uniform along the length of a root. Figure 4.5 on page 86 shows this quite nicely. As you can see the increasing suberization in older parts of the root prevent water uptake through the endodermis. Indeed water intake is limited to the zone just behind the elongation area at the root tips. However, the important point here is that the endodermis has transport proteins that allow the root to accumulate ions by active transport.