Fig. 2.13. Diagram showing plant cell walls (black line), cell membranes (green lines), and relative amount of water (blue ovals) inside the cell. The arrows show the direction of water moving in (yellow) and out (green) of a plant cell placed in these environmental conditions: (A) hypertonic, (B) isotonic, and (C) hypotonic solutions. The movement of water into or out of these plant cells cause (A) plasmolyzed (shrunken), (B) flaccid (wilted), and (C) turgid (firm) cell conditions.