the external solute concentration. The 2 sugar solution was increased because the substance was hypertonic. The cell membrane does allow water to move from higher to lower concentrations but does not allow solutes do that. Gap junctions are the channels which allow materials to flow between cells. This allowed me to work out averages so that my results were very accurate. In Land plants this water plays a vital role in the support of tissues and the transport of materials around the organism. One difficulty was cutting the pieces of potato into the exact same sizes. I predict that the stronger the solution of sucrose the more mass the pieces of potato will loose. E) Phagocytosis is the process where the cell obtains solid matter. The molecules all move in the same direction. A) Bulk movement is the overall movement of a fluid. This causes the water to no longer enter the cell.
As osmosis is the diffusion of water molecules and as diffusion is the random movement of particles from areas of high concentration to low concentration it might be expected that any factors that speed up or slow down the movement of these particles will affect. Experimentation is necessary to determine which membranes permit selective flow, or osmosis, because not all membranes act in this way. A semi-permeable membrane that may be used for such a demonstration is the membrane found just inside the shell of an egg, that is, the film that keeps the white of the egg from direct contact with the shell. Exocytosis is the expelling of a material outside a cell.
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As it would be impossible to measure with any degree of accuracy the expansion or contraction of cells on an individual basis I have decided to look at gain or loss of water in terms of increase or decrease in mass. In this demonstration, the water moves in both directions through the membrane; the flow is greater from the vessel of pure water, however, because the concentration of water is greater there, that is, fewer dissolved substances exist in this solution than in the sugar solution. Water loss can continue to such an extent that the cytoplasm, and attached cell membrane, contracts and detaches from the cell wall. This keeps the solution in the cell making the concentration high and thus no further penetration of water. One last thing is that different potatoes have different concentrations so the results may vary for different potatoes. Hypertonic is more solute to a certain amount of water.
Osmosis is similar to diffusion but is differentiated by the membranes behavior. The concentration gradient affects osmosis by the same manner it does in diffusion. The glucose results were recorded on a different day from the saline results. The cell does not allow the solution to exit the cell when water is entering. The vice versa happened in the distilled water solution. This evaporation is called transpiration and the xylem flow resulting is called the transpiration stream. Isotonic is the equal amount of solutes in two different solutions. There are a few that are just of the best-fit line, which is probably because the potatoes were different so they have different concentrations or the sizes of the potato pieces may be different.
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