Isotonic environment - conditions are the same inside and outside of the cell

Hypertonic - a solution that is more concentrated

Hypotonic - a solution that is less concentrate

In hypertonic or hypotonic environments, however, organisms that lack rigid cell walls must have other adaptations for osmoregulation

• Osmoregulation is the control of solute concentrations and water balance

Check your notes for more on Water potential, Solute Potential and Pressure Potential