(D) By convention, the water potential of pure water at standard temperatures, which is not under any pressure, is taken to be zero. Water potential i

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(D) By convention, the water potential of pure water at standard temperatures, which is not under any pressure, is taken to be zero. Water potential is denoted by the Greek symbol $\Psi_w$ (psi). Since pure water has the highest concentration of water molecules, it has the highest water potential, which is defined as $0$.