Answer:
The result for the 0.2 mol/dm3 sugar solution can be explained based on the process of osmosis. Osmosis is the movement of water molecules across a semi-permeable membrane from an area of lower solute concentration to an area of higher solute concentration.
In the experiment, each dandelion strip was placed into a different concentration of sugar solution. The outer edge cells of the dandelion strip have a waxy, waterproof layer that acts as a semi-permeable membrane. When the dandelion strip was placed in the 0.2 mol/dm3 sugar solution, the following happened:
The surrounding sugar solution had a higher solute concentration (0.2 mol/dm3 sugar) compared to the solute concentration in the dandelion cells. As a result, water molecules from within the dandelion cells moved outwards across the semi-permeable membrane in an attempt to equalize the solute concentration on both sides.
Due to osmosis, water loss occurred from the dandelion cells to the surrounding sugar solution. This caused the dandelion strip to lose turgor pressure and become flaccid or wilted. The central cells of the dandelion strip, which do not have the waxy, waterproof layer, were able to lose water more easily, resulting in a more pronounced wilted appearance.
The drawing of the dandelion strip after being in the 0.2 mol/dm3 sugar solution would show a wilted appearance, with the outer edges visibly wilted compared to the center of the strip.
This observation supports the concept that water moves from an area of lower solute concentration (inside the dandelion cells) to an area of higher solute concentration (the surrounding sugar solution) through osmosis. In this case, the higher solute concentration outside the cells caused water to move out of the cells, leading to wilting.