BIO NMDCAT Biological Importance of Water

nmdcat.online June 27, 2026

The “water potential” of pure water at standard atmospheric pressure is defined as

A. 0 bars

✓

B. -1 bars

C. 100 bars

D. 1 bar

📝 Explanation

By convention, the water potential of pure water at ambient pressure and temperature is defined as zero. Any addition of solute lowers the solute potential (making it negative), and any positive pressure increases the pressure potential, so most biological solutions have a negative total water potential.

📖 Additional Information

0 bars
-1 bars
100 bars
1 bar

By convention, the water potential of pure water at ambient pressure and temperature is defined as zero. Any addition of solute lowers the solute potential (making it negative), and any positive pressure increases the pressure potential, so most biological solutions have a negative total water potential.

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