Answer 1

When we place an eukaryotic cell in hypotonic solution, it swells up and ultimately bursts because of the large quantity of water entering the cell.

When we place an eukaryotic cell in isotonic solution, there is no change in its size, as the water concentrations in the external and internal media are the same.
When we place an eukaryotic cell in hypertonic solution, it gets plasmolysed because of the excess loss of water.