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

The movement of water from the soil into the root hair of a plant is primarily driven by a

A. Positive hydrostatic pressure in the soil
B. Gradient in water potential, where the root hair cells have a more negative water potential
✓
C. Active transport of water molecules through the root cell membrane
D. High concentration of pure water being pumped into the root

📝 Explanation

Root hair cells actively accumulate ions and sugars, making their solute potential very negative and thus their total water potential lower (more negative) than the surrounding soil water. Water moves passively down this water potential gradient by osmosis.

📖 Additional Information

  • Positive hydrostatic pressure in the soil
  • Gradient in water potential, where the root hair cells have a more negative water potential
  • Active transport of water molecules through the root cell membrane
  • High concentration of pure water being pumped into the root

Root hair cells actively accumulate ions and sugars, making their solute potential very negative and thus their total water potential lower (more negative) than the surrounding soil water. Water moves passively down this water potential gradient by osmosis.

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