Solution

Water flows along its own concentration gradient. When a cell is placed in a hypotonic medium it swells due to absorption of water by the process of endosmosis. The endosmotic gain of water makes a cell turgid. When a cell is placed in a hypertonic medium, it loses water due to the process of exosmosis. Exosmotic loss of water results in plasmolysis. Thus, the correct answer is option B.