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Osmosis is defined as the net movement of water or any other solutions molecules from a region in which they are highly concentrated to a region in which they are less concentrated. This movement must take place across a partially permeable membrane such as a cell wall, which lets smaller molecules such as water through but does not allow bigger molecules to pass through. The molecules will continue to diffuse until the area in which the molecules are found reaches a state of equilibrium, meaning that the molecules are randomly distributed throughout an object, with no area having a higher or lower concentration than any other.

Plant cells always have a strong cell wall surrounding them. When they take up water by osmosis they start to swell, but the cell wall prevents them from bursting. Plant cells become "turgid" when they are put in dilute solutions. Turgid means swollen and hard. The pressure inside the cell rises and eventually the internal pressure of the cell is so high that no more water can enter t

Water moves in these directions because

For this experiment I feel that my results have not reflected my prediction as accurately as I would have hoped and this may be due to many reasons. For example, it was hard to ensure that our measurements were accurate enough, some potato cylinders may have been dried more thoroughly than others therefore withdrawing more water, I could find another way to dry the potatoes that would ensure that all were dried in the same way for the same time. I would repeat my measurements again if I were to do another experiment paying particular attention to the length. Perhaps I would test my experiment more than 3 times just to make sure that my results we 100% accurate. As mentioned before, the length showed the most anomalies so to improve the measurement I hope to take them 3 times for each cylinder for assurance. The weight could have been made more accurate by finding a balance that gives measurements to 3 decimal places however this was not a big problem. It was hard to insure that our potato cylinders were left for 24 hours exactly, as we did different concentrations of sucrose solution on different days, and we could only return to the laboratory at specific times to record our results therefore some potatoes may have had longer to perform osmosis. To improve this next time, it would be better to set our experiment up on the same day and leave until we could next return.

 When weighing your potato, make sure the scale is at zero before you place the potato on the scale.

As we know osmosis is the movement of water from a high concentration to a low concentration. The cell membrane is designed specially to allow small molecules such as water through but the hole in the partially permeable membrane enough to allow big molecules such as sugar molecules through. If you place a plant in water, the water will enter the cell as it is trying to even the concentration of water out. The cell will swell up as it moves in, however unlike an animal cell the cell will not burst it will only become what we call ‘turgid’ this means it will only stretches but eventually the cell wall will not be able to stretch any further so it stops stretching. The plant cell does not allow itself to burst as it has a tough cellulose wall.

Some topics in this essay:
Osmosis Aim, Method Equipment, sucrose solution, potato cylinder, test tube, cell wall, potato cylinders, plant cells, plant cell, distilled water, movement water, experiment day, partially permeable membrane, solutions molecules region, molecules region highly, highly concentrated region, region highly concentrated,