A) Movement of water is expressed in terms of free energy
B) Free energy determines the direction by which physical and chemical changes should occur
C) Water potential is the sum of free energy of water molecules in pure water and in any other system
D) Water potential of pure water is zero
Correct Answer: C
Solution :
The water potential \[\text{(}{{\text{ }\!\!\psi\!\!\text{ }}_{\text{w}}}\text{)}\]in a plant cell or tissue is equal to the algebric sum of the solute potential \[\text{(}{{\text{ }\!\!\psi\!\!\text{ }}_{\text{w}}}\text{)}\]due to dissolved solutes and the pressure potential \[\text{(}{{\text{ }\!\!\psi\!\!\text{ }}_{\text{p}}}\text{)}\]due to pressure developed within the cells or tissues i.e., \[{{\Psi }_{w}}={{\Psi }_{s}}+{{\Psi }_{p}}\]
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