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The aim of this experiment is to investigate the movement of water into and out of plant cells by osmosis. We want to see how much the weight of a potato tube varies in different concentrations of sucrose solution

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Introduction

AT1 Assessed Practical Planning Aim The aim of this experiment is to investigate the movement of water into and out of plant cells by osmosis. We want to see how much the weight of a potato tube varies in different concentrations of sucrose solution Introduction For this experiment we are going to use potato tubes as these will be easily weighed and measured and can provide a certain degree of accuracy. We are going to place the tubes in sucrose solutions of different strengths and see what happens to the tube. Osmosis Diagram This diagram shows how osmosis works. Variables [image002.gif] [image003.gif] [image004.gif] Length [image005.gif] Amount of sucrose solution Strength of sucrose solution Weight Oval: Variables I have decided to test how the weight varies in different strengths of sucrose. We will test it by putting potato tubes of equal length into different strengths of solution and leave them for 24 hours and see what changes have developed. ...read more.

Middle

As the sugar concentration in the potato will be high against the 0% in the petri dish. This means that the water will move from the petri dish and into the potato. This is caused by the potato attempting to make the concentrations even. Sucrose Concentration Start Weight End Weight Weight change Percentage weight change 0% 5% 10% 15% 25% 35% Trail investigation I think our trial investigation went well. We produced and good set of results and they matched with what I thought it was going to be like. I think the result were measured as accurately as possible and I think we took enough readings for the first experiment. The range of reading is suitable for this experiment. I think in the next investigation we will measure two potato tubes so we can get a more reliable set of results. The amounts of potato were adequate and we have recorded the results in a way that is easy to understand. ...read more.

Conclusion

Analysing evidence and drawing conclusions Conclusion I conclude that as the concentration of sugar solution goes down, the weight change increases in the potato tubes. This conclusion backs up my original prediction that says that the weight of a potato tube should decrease when the sugar solution is higher and increase when the sugar solution is at its lowest. Evaluation The results that we got were similar to each other and overall I think they were reliable. We did not get any really odd results and we did not get any that were obviously inaccurate. I think if we were to want a more reliable conclusion we would have to repeat the experiment a few more times to make sure that our results were typical. I think our method suited our investigation well however we could have changed a few aspects such as testing whether the temperature or the amount of light affected the results. If we were to extend the investigation, we would have to test other variables such as these to develop a wider understanding and so make our conclusion more reliable. ...read more.

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