Multiple choice A cell increases in volume if external medium is ___________. isotonic hypertonic hypotonic slightly hypertonic no matter whether the medium is hypertonic or hypotonic Reveal answer Fill a bubble to check yourself C Correct answer Explanation If the water concentration of the cell cytoplasm is lower then that of the medium (i.e., the medium is a hypotonic solution) surrounding the cell then osmosis will result in the cell gaining water.