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Water Flow in Plant Tissue.
Member rating: No Rating | Words: | Submitted: Sat Aug 30 2003
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Water Flow in Plant Tissue. Introduction and Background. Water Potential ? is the difference in intramolecular pressure exerted in a given specimen with reference to the intermolecular pressure exerted between molecules of pure free water at atmospheric pressure and the same temperature. The plant cell vacuole may be considered as a homogenous phase, separated by the tonoplast, cytoplasm and plasma membrane from the surrounding fluid. These may be considered as a single complex membrane, which is permeable only to water, that s for the purposes of this experiment. The cellulose wall which surrounds the cell is regarded as being completely permeable but of considerable strength and elasticity. Any pressure exerted by the cytoplasm on the vacuole is ignored in this experiment but is about 200 Kpa. The main pressure is exerted by the wall. In solutions of high water potential or in pure water the vacuole takes in water and expands. As a...
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