Which of the following statements is true of osmosis in cells?

• A. It is the movement of solute molecules from lower solute concentration to higher solute concentration across a membrane, requiring ATP.
• B. It is the movement of water across a membrane only when aquaporin channels are absent.
• C. It is the net movement of water across a selectively permeable membrane from lower solute concentration (higher water potential) to higher solute concentration (lower water potential).
• D. It is the net movement of water across a membrane from higher solute concentration to lower solute concentration.

Answer: (C)