Question

a red blood cell is placed in a hypertonic solution. how will this affect the cell?
water will move into the cell causing it to burst
water will move out of the cell causing it to shrink
the cell will not change

Explanation:

In a hypertonic solution, the concentration of solutes (like salt) outside the cell is higher than inside. According to the principle of osmosis, water moves from an area of lower solute concentration (inside the cell, 1% salt) to an area of higher solute concentration (outside the cell, 4% salt). So water will move out of the cell. When water leaves the cell, the cell loses volume and shrinks.

Answer:

Water will move out of the cell causing it to shrink