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The importance of osmosis to plants.

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Introduction

Aim The aim of our investigation is to show the importance of osmosis to plants. Small pieces of potato of equal size and shape are placed into solutions of distilled water, dilute sugar and concentrated sugar (sucrose). We will record daily the changes in the weight of the potato. Prediction I predict that the greater the concentrations of water in the external solution the greater the amount of water that enters the cell by osmosis. The smaller the concentration of water in the external solution the greater the amount of water that leaves the cell. There will be however a point where the concentration of the water inside and outside the potato cells where it will be equal. ...read more.

Middle

Method Apparatus 1 molar sugar solution, distilled water, potato, mass balance, 5 test tubes, scissors, labels, measuring cylinder, cling film and a test tube holder. Preliminary For the preliminary work we suggested that the concentrations were the best and that they were more accurate than any smaller amount of concentrated liquid and too much was not really need because there was not much difference. There is another thing that we will have to be careful about which is that when we are taking out the potatoes that we do not spill some of the liquid. This is a table of how the concentrations were mixed Volume of distilled Volume of 1molar Concentration of sugar 10 0 0.0 8 2 0.2 6 4 0.4 4 6 0.6 2 8 0.8 0 10 1.0 Step-by-step 1. ...read more.

Conclusion

At concentrations above 0.6m, there appears to be no further weight loss so this is suggesting that the cell is fully plasmolysed. Then the cells start drawing in a very little amount of water that increases the weight slightly. Evaluation The graph obtained in the results has a great connection to the one in the prediction. This predicts that the experiment was fairly accurate. Although the accuracy was fairly good there were a few things that could be improved. The concentrations were measured in a measuring cylinder and could be more accurate using a titration. Also when the potato was dried to remove surface liquid it was not necessarily done the same with each potato, a more accurate and uniform way of drying would improve the accuracy further. Osmosis - Science Coursework By Anthony Lawlee ...read more.

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