: Cell water relationships are important topics to be included in cell biology courses. Differences exist in
the control of water relationships in plant cells relative to control in animal cells. One important reason for these
differences is that turgor pressure is a consideration in plant cells. Diffusion and osmosis are the underlying factors
involved in the control of water in plant cells; however, additional attention must be given to osmotic pressure,
osmotic potential, and water potential. This discussion shows how these parameters relate to each other, and how
they are explained by thermodynamics and the universal gas laws. Detailed laboratory exercises are described that
demonstrate these principles. The laboratory exercises include data collection, graphing of data, statistical analysis
of data, and calculations of osmotic potential and diffusion pressure deficit from the data.
Keywords: Turgor, osmotic pressure, osmotic potential, water potential, diffusion pressure deficit
: Cell water relationships are important topics to be included in cell biology courses. Differences exist inthe control of water relationships in plant cells relative to control in animal cells. One important reason for thesedifferences is that turgor pressure is a consideration in plant cells. Diffusion and osmosis are the underlying factorsinvolved in the control of water in plant cells; however, additional attention must be given to osmotic pressure,osmotic potential, and water potential. This discussion shows how these parameters relate to each other, and howthey are explained by thermodynamics and the universal gas laws. Detailed laboratory exercises are described thatdemonstrate these principles. The laboratory exercises include data collection, graphing of data, statistical analysisof data, and calculations of osmotic potential and diffusion pressure deficit from the data.Keywords: Turgor, osmotic pressure, osmotic potential, water potential, diffusion pressure deficit
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