BIOLOGY 1AL Lecture Notes - Lecture 17: Transpiration, Turgor Pressure, Guard Cell
Document Summary
Depends on humidity and temperature of the surrounding environment. Principles of water movement: mass flow, mass flow=movement of h2o from a region of higher conc -> region of lower conc, diffusion, osmosis. Measure the potential of h2o to move from higher to lower concentrations. Reference point for = of pure water = zero = pure water. Since pure h2o is zero, anything diffused in h2o decreases its. Measuring of a sdn less pure than pure h2o -> negative # From a region of high to low conc until the distribution is uniform = equilibrium. When diffusing species in h20 then mass flow and difference are he. The driving force for h20 movement in plants is the evaporation of h2o from the surface of the leaf. Solute = total salt dissolved in solvent s/pi. Pore closes and opens: lowers of conc by moving k+ into guard cell, water moves into the guard cell.
