Water potential of pure water is__________?
Correct answer: A. zero
- A. zero
- B. one
- C. negative
- D. two
Explanation
Water potential is defined relative to pure water, which is assigned a value of 0 MPa under standard reference conditions. Solutions have lower, usually negative, water potential, so students may incorrectly choose negative by applying the rule for a solution to pure water.
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About Biological Importance of Water
Water supports life through its polarity, hydrogen bonding and ability to dissolve ionic and polar substances. Its high specific heat, heat of vaporization, cohesion, adhesion and incompressibility help regulate temperature, transport materials and maintain structure, while hydrolysis and osmosis depend directly on water.
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