it dies
When a plant does not get enough water, the cell wall loses turgor pressure, causing it to become flaccid. This can lead to wilting of the plant. Continued lack of water can eventually lead to cell death and damage to the cell wall.
if the plant cell is in concentrated water...it shrinks .i.e the water in plant cell flows out and hence the plant cell loses its turgidity and shrinks.this process is called exosmosis .
the cell won't have water when it is needed
Absorbs more water by endoosmosis
If a plant cell is placed in fresh water, there will be a net movement of water into the cell - because the solute concentration inside the cell is greater than outside. This occurs because the system is attempting to reach equilibrium (where the concentrations inside and outside are equal). Unlike an animal cell, a plant cell will not burst when excess water enters the cell. This is because the cell wall helps the plant cell maintain its structure.
Plant cells have bigger vacuoles filled with cell sap. When you water a plant, the water collects in the vacuole and makes it stiff. This is why plants wilt if they don't get enough water.
They both will eventually burst.
Cell sap
When a plant cell loses water it will undergo a condition called plasmolysis. This condition only happens in the extreme condition and rarely happens in the natural conditions.
If a neglected house plant does not receive enough water, it can lead to a decrease in turgor pressure within the plant cells. This can cause the plant to wilt as it loses structural support and becomes dehydrated. Regular watering helps maintain turgor pressure and keeps the plant healthy.
It can possibly burst.
If excess water moves into an animal cell, it will eventually burst. This happens if the cell is placed in a hypotonic solution (a solution with a lower solute concentration than the cell).