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Question
Identify the INCORRECT statement.
Options
In a flaccid cell, T.P. is zero.
In a turgid cell, DPD is zero.
In a fully turgid cell, TP = OP.
The water potential of pure water is negative.
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Solution
The water potential of pure water is negative.
Explanation:
According to the principle of thermodynamics, every component of a system has a definite amount of free energy which is used to do work. Osmotic movement of water is on the basis of free energy. Free energy per molecule in a chemical system, is called its chemical potential. The chemical potential of water is called water potential. The water potential of protoplasm is equal but opposite in sign to DPD. It has a negative value. The water potential of pure water is always zero. The addition of any solute in it decreases its psi (Ψ) value. Therefore, it has a negative value.
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