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Unformatted text preview: WATER MOVEMENT I. Water Movement in and out of a living plant cell. a. Dependent on a water chemical potential (psi) gradient. a.i. Psi = Pressure + Amount (Purity) + Gravitation + Amount that Adheres (reduces psi) For short distances and well-hydrated cells: Psi = Pressure (Psi P = wall) + Amount (Psi S) a.ii. Add solute to solvent. Therefore less water molecules a.iii. Cohesion = Water sticking to itself a.iv. Adhesion = water sticking to other chemicals a.v. Therefore, changes in the amount of water (its purity) and wall pressure determine changes in the Psi of the parenchyma cell wall b. Factors that determine chemical potential for a substance: b.i. Amount b.ii. Temperature b.iii. Pressure b.iv. Gravity b.v. Electrical Potential (for charged substances) c. Why is water movement important to any organism? c.i. Dependent on the chemical potential energy of water (psi) at two points (a psi gradient) Water in plants is used for growth in cells Everything living needs water to a certain degree...
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