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Investigation of the effect of differing concentrations of sucrose solution on potato.

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Introduction

Investigation of the effect of differing concentrations of sucrose solution on potato Background Knowledge Osmosis is the diffusion of water molecules from an area of high concentration of water molecules to an area of low concentration of water molecules through a selectively permeable membrane. Osmosis occurring across a selectively permeable membrane The molecules move down a concentration gradient Plant cells are surrounded by a cell wall. Osmosis acting on a plant cell when a cell is in a less concentrated solution occurs with the water molecules into the cell. Water diffuses into the cytoplasm and vacuole through the selectively permeable membrane causing the cell to swell and become burgid. Plant cell in a less concentrated solution In a concentrated solution when osmosis takes place water diffuses out of the cytoplasm and vacuole. First the cell shrinks a little and becomes flaccid. The membrane then pulls away from the cell wall and the cell is plasmolysed. Plant cell in a more concentrated solution Plan for Investigation I plan in this investigation to investigate the hypothesis that the higher the concentration of sucrose solution the potato will shrink, but in a less concentrated solution it will expand. ...read more.

Middle

Put 20 cm of 2M sucrose solution into two of the test tubes 6) Add a potato piece into each test tube and leave overnight 7) Repeat steps 2 to 6 four times using a different concentration of sucrose solution each time. Follow the table below to be able to make up the required solutions. 8) Remove the potato pieces and measure their final length and final mass and work out the percentage change in mass and length using the following two equations- Percentage change in length Final length - initial length = Change in length Change in length Initial mass X 100 Percentage change in mass Final mass - initial mass = Change in mass Change in mass Initial mass X 100 9) Record all your results unto a table and plot your results onto a graph Strategy for dealing with results I will record my results unto 3 tables like the 3 three below- I will plot two graphs using the following axes- Fair test To ensure a fair test and accurate results I will conduct two experiments for each different concentration and will calculate the average loss in weight and length. ...read more.

Conclusion

I can see from my graph and results that the hypothesis was proved correct and I can also see that my graphs follow the trend, which I predicted they would. The reason why my predictions and my hypothesis were proved correct is because of osmosis. Water molecules move from cell to cell by osmosis. Osmosis is when water molecules move from an area of high concentration of water molecules through a selectively permeable membrane to an area of low concentration of water molecules. The water molecules move down a concentration gradient. Plant cell in a less concentrated solution In a less concentrated solution the cell will swell, however in a more concentrated solution the opposite occurs. Plant cell in a more concentrated solution Evaluation My results support the firm conclusion that the potato shrinks in a higher concentrated solution but expands in a less concentrated solution. If I were to do the investigation again I would conduct three experiments for each concentration and calculate the average result. I would also take a range of concentrations between 0M and 2M at 0.25M intervals rather than at 0.5M intervals. Doing both these things would ensure that I would get even more accurate and precise results. ...read more.

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