Question

when a cell is in a hypotonic solution, how will water molecules move?

Answer 1

water moves to equalize concentrations across the semipermeable membranes...

hypo- means less than

Answer 2

A cell has a semipermeable membrane which allows water and small uncharged nonpolar substances to enter. And Oxygen and uncharged molecules

Water therefore will be transported based on osmosis.

A hypotonic solution means that the solution is less concentrated than the cell.

Water will tend to more from hypotonic to hypertonic (I think) therefore water will move into the cell

When water moves into the cell it will cause the solution's concentration to increase. Remember concentration = solutes/volume

So if the solution decreases in volume the concentration will increase to equalize with the cell's concentration of solutes.