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BIO NMDCAT Biological Importance of Water
nmdcat.online June 27, 2026

During osmosis, the movement of water across a semi-permeable membrane from a hypotonic to a hypertonic solution is driven by the

A. Difference in the volume of water on the two sides of the membrane
B. Difference in water potential, with water moving towards the more negative potential
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C. Requirement for equal solute concentrations to be established on both sides
D. Active transport of water by aquaporin proteins

📝 Explanation

Water moves from a region of higher water potential (lower solute concentration) to a region of lower water potential (higher solute concentration). It is the water potential gradient, not the solute concentration gradient per se, that provides the driving force.

📖 Additional Information

  • Difference in the volume of water on the two sides of the membrane
  • Difference in water potential, with water moving towards the more negative potential
  • Requirement for equal solute concentrations to be established on both sides
  • Active transport of water by aquaporin proteins

Water moves from a region of higher water potential (lower solute concentration) to a region of lower water potential (higher solute concentration). It is the water potential gradient, not the solute concentration gradient per se, that provides the driving force.

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