Question

Water potential of pure water at normal temperature and pressure is ........

• A. zero
• B. always more than one
• C. one
• D. less than one

Hint:

Water potential is zero for pure water, and it becomes negative when solutes are added.

Answer 1

The Correct Option is A

Step 1: Understanding water potential.
Water potential is a measure of the potential energy of water in a system. The water potential of pure water at standard conditions (normal temperature and pressure) is considered zero.
Step 2: Analyzing the options.
(A) zero: Correct — The water potential of pure water is zero by definition.
(B) always more than one: Incorrect — Water potential is not greater than one in pure water.
(C) one: Incorrect — Water potential of pure water is zero, not one.
(D) less than one: Incorrect — Pure water has a water potential of zero, not less than one.
Step 3: Conclusion.
The correct answer is (A) zero, as pure water has a water potential of zero under standard conditions.