What can the process of plasmolysis in plant cells be defined as?

The correct answer is Shrinkage of cytoplasm in the hypertonic medium.
Plasmolysis is defined as the shrinkage of the cytoplasm away from the cell wall of a plant or bacterium due to water loss. A good example is well; a cell is in a hypertonic medium. In this process, the cell loses water to the hypertonic solution. This does not happen in a hypotonic solution as the cell wall would be more rigid.

The reserve of plasmolysis is deplasmolysis. Deplasmolysis is also known as cytolysis. It is the process in which the cytoplasm swells when in a hypotonic medium.

Plasmolysis can be defined as the shrinkage of the cytoplasm in the cell due to a lack of water. This can be caused when the cell is put into a hypertonic solution. The water or solution outside the cell has more salt, so the water and/or the salt from the hypertonic solution leaves or enters the cell - depending on the circumstances.

This could also be caused by a sudden intake of salts, causing there to be less room for water in the cytoplasm.
Plasmolysis can also happen in animal cells; it doesn’t happen in just plant cells. This can happen when we are dehydrated, for example. The cells don’t have enough water - or electrolytes - so they shrink up to conserve energy.