Whats occur when ells re placed in a high-salt solution?
and why does this happen?

If you put a plant into water with a salt concentration that is higher than the concentration inside its cells, water will move out of the plant to balance out the concentration difference. As a result the plant shrinks and eventually dies

they shrink and dry up

Explanation:

if there is a higher concentration of dissolved salt outside of the cell (a hypertonic environment), then H20 will diffuse "out" from the cell and the cell will dehydrate and shrink and cellular metabolism will cease. This phenomenon is called plasmolysis and it is the reason why foods can be preserved with high concentrations of salt and sugar.