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TEAS 7 Scientific Reasoning Practice Test

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Diffusion is the movement of solutes from high to low concentration; osmosis is diffusion of water across a semipermeable membrane.
Correct Answer:
Diffusion is movement of solutes from high to low concentration; osmosis is diffusion of water across a semipermeable membrane.
Explanation:
Diffusion moves particles from areas of higher concentration to areas of lower concentration, driven by random molecular motion. Osmosis is the specific case where water diffuses across a selectively permeable membrane from the side with lower solute concentration to the side with higher solute concentration. This statement matches that distinction: diffusion is described as moving from high to low concentration, and osmosis as water diffusion across a semipermeable membrane. Both processes are passive and require no energy input. The other choices misstate key points: diffusion isn’t energy-dependent, osmosis requires a membrane, and diffusion occurs in gases and liquids as well as solids.

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