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Investigation into the effect of salt solutions on plant cells

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Introduction

Investigation into the effect of salt solutions on plant cells Background Osmosis is defined as: "the net movement of water molecules from a less concentrated solution to a more concentrated solution across a semi-permeable membrane..." 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 pass through 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. Information on plant cells: 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. ...read more.

Middle

* I shall then lay them out next to each other and cut them so that each is of the same width and length. * So that none of the excess water is weighed and adds to the weight to give false results, I shall attempt to get rid of it by drying off the excess with kitchen towel. * The next step will be to weigh the potato cylinders and note down their initial weight so that later on in the experiment I can compare the difference. Step 3 * I shall place 1 potato cylinder into each test tube and leave them. * I will then take them out at these intervals:30 mins, 2 hours, 4 hours, and 12 hours, and dry off the excess water, weigh them and note down the number. It will be then that I can see the difference. ...read more.

Conclusion

* To keep the water potential of the potato initially will be kept the same by using the same type of potato, which have been treated in the same way, e.g. have all been cut without being washed and peeled. * The mass of the potato is a dependent variable, and this means that it will be measured throughout the experiment. I will measure the mass in grams. The potato chip will be measured before it is put in the solution, and after. This will allow us to see whether osmosis has taken place, and to what extent. * The volume of the solution that the potato chips are kept in must be fair. The must be totally covered in the solution, and the amount of solution will be kept the same because all the potato chips are the same size. * I am also going to use the same balance to weigh my potato chips. This is because the measurements may slightly vary between scales. ?? ?? ?? ?? ...read more.

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