Question

what is a hypotonic solution?

Answer 1

a hypotonic solution is the one in which there is a high concentration of  solvent compared to that of the solute

Answer 2

If the medium surrounding the cell has a higher water concentration than the cell, meaning that the outside solution is very dilute, the cell will gain water by osmosis. Such a solution is known as a hypotonic solution. In such a condition, the cell is likely to swell up as the net result is that water enters the cell.