Examine this cell from page 197 in your book, what has happened to this plant cell and why

The plant cell in the image is showing signs of plasmolysis. This is a process that occurs when a plant cell is placed in a hypertonic solution, a solution with a higher concentration of solutes than the cell itself.
Plasmolysis is a physiological process in plant cells where the cell membrane pulls away from the cell wall due to the loss of water.
This occurs in a hypertonic environment, where the external solution has a higher solute concentration than the cell's cytoplasm.
As water moves out of the cell, the protoplast (cell contents) shrinks and detaches from the cell wall.
This is a process that occurs when a plant cell is placed in a hypertonic solution, a solution with a higher concentration of solutes than the cell itself.
Water moves out of the cell by osmosis, causing the cytoplasm to shrink and the cell wall to pull away from the plasma membrane.
Plasmolysis can be caused by a number of factors, including:
Water stress, such as drought or high salinity
Exposure to certain chemicals, such as herbicides
Mechanical damage
In the image you provided, the cell wall is clearly visible and the cytoplasm is pulled away from it.
This is a classic sign of plasmolysis.
If a plant cell is plasmolyzed for too long, it can die.
However, if the cell is placed back in a hypotonic solution, water will rush back into the cell and the cytoplasm will expand.
The cell will return to its normal shape and function.
Plasmolysis is a reversible process, but it can be detrimental to plant health if it occurs frequently or for prolonged periods of time.