Final answer:
When placed in a hypertonic solution, a cell will shrink as water leaves it to balance solute concentrations between the inside and outside of the cell.
Step-by-step explanation:
When a cell is placed in a hypertonic solution, which means that the solution has a higher concentration of solutes compared to the inside of the cell, the reaction of the cell can be described as follows: the cell will shrink as water is pulled out of the cell to equalize the concentrations inside and outside the cell.
This occurs because water moves across the cell membrane by osmosis from the area of lower solute concentration (inside the cell) to the area of higher solute concentration (outside the cell). This loss of water leads to the cell shrinking and shriveling, a process known as crenation in animal cells or plasmolysis in plant cells.