The Effects of Tonicity, Diffusion, and Osmosis on a Plant Essay

394 WordsMay 25, 20132 Pages
The Effects of Tonicity, Diffusion, and Osmosis on a Plant Introduction: It is important for cells to have the ability to exchange material and information in and out of the cell because if that wasn’t possible, then almost all biological processes wouldn’t be able to be carried out in the human body. The cell membrane acts as a barrier that lets in exclusively materials and information that the nucleus of the cell allows for use. Without the protective phospholipid bilayer of the cell membrane, the cell would not stay together, or be protected from any foreign bodies trying to enter the cell without permission from the rest of the body. Diffusion and Osmosis are two ways that substances can enter or leave the cell. Diffusion is the passive movement of molecules or particles along a concentration gradient, or from regions of higher to regions of lower concentration. Osmosis is diffusion of a solvent (usually water molecules) through a semipermeable membrane from an area of low solute concentration to an area of high solute concentration. Tonicity of a solution, usually water, determines how the cells of plants or animals will look and behave; if the solution contains too much saline, then the cells will become dehydrated and appear flaccid, but if there is too much liquid and not enough saline to rid the cell of excess liquid, then the cell will appear lysed, and has the potential to pop when it is in that state. The experimental hypothesis for this experiment is that if a solution had a concentration gradient across a barrier, then movement will occur because molecules are small and/or uncharged. The null hypothesis for this experiment is that if a solution has a concentration gradient across a barrier, then movement will not occur because molecules are small and/or charged. Materials: * Elodea leaves * Water * Beakers * Pipettes *

More about The Effects of Tonicity, Diffusion, and Osmosis on a Plant Essay

Open Document