Osmosis is the diffusion of water molecules across a selectively permeable membrane.
The term tonicity refers to the water concentration of a solution.
The prefix iso means equal, the prefix hyper means high, and the prefix hypo means low.
A hypertonic solution will have a higher concentration of solutes compared to another solution.
A hypotonic solution will have a lower concentration of solutes compared to another solution.
An isotonic solution will have an equal concentration of solutes compared to another solution.
An animal cell placed in a hypertonic solution will shrink, also known as crenation. A plant cell placed in a hypertonic solution will become turgid.
An animal cell placed in a hypotonic solution will swell, possibly lyse. A plant cell placed in a hypotonic solution will become dehydrated.
Plant and animal cells placed in an isotonic solution will both stay normal size.