Final answer:
The growth rate of plant cells and efficiency of physiological processes are not highest when the cells are at minimum turgor.
Step-by-step explanation:
The statement is FALSE.
Plant cells require an adequate amount of water in their internal environment to maintain turgor pressure. Turgor pressure is the pressure exerted by the cell's contents against the cell wall, providing support and regulating cell growth.
Cells at minimum turgor would have insufficient water, resulting in a loss of turgor pressure and a decrease in the efficiency of physiological processes.