Unformatted text preview: Root hairs increase the surface area for absorption, and soil particles with their surrounding water films adhere to root hairs to promote a diffusion gradient. Root hairs may also use active transport for uptake. Mycorrhizae associates absorb both water and minerals and transfer them into the roots. Once through the root cortex, substances pass into the cells of the endodermis (protected by the casparian strip) and from root stele parenchyma cells into xylem tissue for upward movement throughout the plant. Dilute minerals also move with water. In spring, even very dilute solutes can move with water through the xylem. The substances that move through xylem are called sap....
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- Fall '09
- Plants, Vascular plant, 300 feet