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Water Relations (2) - WATER RELATIONS 1 2 3 Major Concepts...

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Water as a Physical and Chemical Medium -Water content of organisms: 50-90% -Water is a medium for biochemical reactions -Water participates directly in biochemical reactions -Water provides a means of structural support in plants (hydroskeleton) ***Organisms must maintain appropriate concentrations of water and dissolved substance (minerals, inorganic salts, amino acids etc.)*** Water Acquisition vs Water Loss Solute Acquisition vs Solute Losses WATER RELATIONS Major Concepts 1. The movement of water down concentration gradients determines the availability of water to organisms. 2. Plants and animals regulate their internal water by balancing water uptake against water loss 3. Marine and freshwater organisms use complementary mechanisms for water and salt regulation
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Water Vapor Density (mg/L) _________________________ Saturation Water Vapor Density (mg/L ) Water vapor pressure ( wvp ) – pressure exerted by water vapor in the atmosphere. Saturation water vapor pressure ( swvp ) - pressure exerted by water vapor in air that is saturated. Vapor pressure deficit ( vpd ) = swvp-wvp (Measures the “evaporative power” of air) WATER CONTETNT OF AIR Relative Humidity = X 100
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