Plant Structure5 - conductive pathways-- apoplast or...

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Plant Structures Root Hairs Root hairs are extensions of the epidermal cells on the surface of the root, and are continually being sloughed off by the soil and regrown. The tiny root hairs, which have a huge total absorptive surface area, have evolved in order to allow the plant to take in as much water from the soil as possible. Not surprisingly, most of the water and minerals taken in by the plant are absorbed by the root hairs. Water and dissolved minerals from the soil move into the root hairs by osmosis and travel into the xylem found in the root, where they are transported to the rest of the plant. The movement of fluids from the root hairs to the xylem can occur through one of two
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Unformatted text preview: conductive pathways-- apoplast or symplast. With the apoplast, water travels along cell walls and through intercellular spaces from the root surface to the core. The symplast route, on the other hand, moves fluids through the cells, via channels that connect their contents. Stem and Trunk Plant stems function in various capacities, primarily in nutrient transport and physical support. The vascular system of plants, complete with xylem and phloem, fills both purposes. Stems, along with roots, also store food for the plant. Pith, a tissue that lies in the center of the stem (or, as it is called in trees, the trunk), is responsible for some nutrient storage as well....
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This note was uploaded on 01/27/2012 for the course BIOLOGY BSC1005 taught by Professor Rodriguez during the Winter '09 term at Broward College.

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