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

The cohesive property of water is primarily responsible for the

A. Ability of water to dissolve non-polar gases like oxygen
B. Formation of a hydration shell around sodium and chloride ions
C. Transport of water and dissolved minerals in the xylem of plants under tension
✓
D. Activation of enzymes that require a dehydrating environment

📝 Explanation

Transpiration pull creates negative pressure in xylem. Due to strong cohesion (H-bonds between water molecules), the continuous water column is pulled upwards. Adhesion to xylem walls also assists, but the tensile strength of the water column is a direct result of cohesion.

📖 Additional Information

  • Ability of water to dissolve non-polar gases like oxygen
  • Formation of a hydration shell around sodium and chloride ions
  • Transport of water and dissolved minerals in the xylem of plants under tension
  • Activation of enzymes that require a dehydrating environment

Transpiration pull creates negative pressure in xylem. Due to strong cohesion (H-bonds between water molecules), the continuous water column is pulled upwards. Adhesion to xylem walls also assists, but the tensile strength of the water column is a direct result of cohesion.

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