hypertonic solution
A hypotonic solution, with a lower solute concentration compared to the inside of the cell, causes water to move into the cell via osmosis. This influx of water makes the cell swell and potentially burst if the osmotic pressure becomes too high.
Any solution with more H2O than inside the cell will cause the cell to swell. Animal cells will burst under a lot of pressure, but plant cells will not, due to the presence of a cell well surrounding the cell. In other words, a hypotonic solution will cause a cell to swell, and a hypertonic solution will cause a cell to shrink. Hypo -> hyper
Osmosis is taking place
The osmosis bag containing the solution with the highest concentration of sugar gained the most weight in the experiment. This is because water moved from the lower concentration solution inside the bag to the higher concentration solution outside the bag through osmosis, causing the bag to swell and gain weight.
You can tell that plant cells are undergoing osmosis if they swell or shrink. When plant cells are placed in a hypertonic solution, they lose water and shrink. Conversely, when they are placed in a hypotonic solution, they gain water and swell. These changes in cell size indicate that osmosis is occurring.
It softens and causes the hair to swell
water enters a cell by osmosis, causing the cell to swell.
It swells because of the amount of water it has inside
A raisin becomes turgid when placed in a hypotonic solution, causing water to enter the raisin through osmosis. This influx of water causes the raisin to swell and become firm or turgid.
A hypotonic solution will make a cell swell. When the environment is hypotonic to the contents of the cell, it will take on water and swell. When a cell is in a hypertonic solution, it will lose water and shrivel up and/or shrink. When a cell is placed in a isotonic solution, the cell is equal and the same. It will not swell nor shrink. Both hypotonic and hypertonic solutions can kill the cell.
The three stages of osmosis are isotonic, hypotonic, and hypertonic. In an isotonic solution, there is no net movement of water molecules. In a hypotonic solution, water moves into the cell, causing it to swell. In a hypertonic solution, water moves out of the cell, leading to cell shrinkage.
If animal cells are placed in distilled water they will absorb water by the process called osmosis. This will make the cell swell and, if it doen not stop, eventually burst. Plant cells placed in distilled water will also absorb water by osmosis but the cell wall prevents them from swelling. Water enters the cells by osmosis because the concentration of the solution inside the cells is higher than that of the 'solution' outside. Water always moves by osmosis from a dilute solution to a concentrated solution (when they are separated by a membrane which lets water through but not dissolved substances). For a good introduction to osmosis see: http://www.chaosscience.org.uk/pub/public_html//article.php?story=20050301222247333