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Diffusion and Osmosis
Biology Lab
16
Biology
Undergraduate 1
02/11/2011

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Term
solution
Definition
a homogeneous mixture
Term
Solute
Definition
substances dissolved in the solvent
Term
Examples of solutes
Definition
sugar, salt
Term
Solvent
Definition
“liquid” portion of a solution
Term
Diffusion
Definition
movement of solute molecules from a high concentration area to a low concentration area
Term
Example of Solvent
Definition
Water
Term
What influences the rate of diffusion?
Definition
Temperature, size of solute molecules, pH, concentration gradient
Term
Osmosis
Definition
movement of water from an area of high water concentration to an area of low water concentration
Term
Tonicity
Definition
Isotonic, Hypertonic, Hypotonic
Term
Isontonic
Definition
stays the same
Term
Hypertonic
Definition
shrinks
Term
Hypotonic
Definition
swells
Term
Turgor pressure
Definition
water enters the cell, creating turgor pressure which presses the cytoplasm against the cell wall
Term
Plasmolysis
Definition
is the process in plant cells where the plasma membrane pulls away from the cell wall due to the loss of water through osmosis
Term
All cells are surrounded by a______________ membrance that allows solutes to pass through to get to their cellular site
Definition
semi permeable
Term
What was the name of the solute we used during the diffusion activity?
Definition
Potassium Permangante
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