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Q.
Which of the following is the unit of measurement of water potential?
Transport in Plants
Solution:
The difference between the free energy of water molecules in pure water and the energy of water in any other system (e.g., water in a solution or in a plant cell or tissue) is termed as water potential. It is designated by Greek letter psi $(\psi)$ and is measured in bars ( 1 milllibar $=102$ pascals) - a unit of pressure.