Which definition best describes the process of diffusion?
a. Movement of a solute from an area of higher concentration to an area of lesser concentration
b. Movement of water from an area of lesser concentration to an area of higher concentration
c. The expenditure of energy to transport a solute
d. The movement of solute and water caused by hydrostatic pressure differences
ANS: A
Diffusion is a process in which a substance moves from an area of higher concentration to an area of lower concentration. Movement of water refers to osmosis. Active transport involves expenditure of energy, and filtration is promoted by hydrostatic pressure differences between areas.
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