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Investigating the effect of osmosis on plant tissues.

Extracts from this document...

Introduction

Investigating the effect of osmosis on plant tissues. Aim My aim for this investigation is to explore the effect of sucrose concentration on potato length. Background Knowledge My background knowledge was taken from a sheet I was given by my teacher on diffusion and osmosis also most of it has come of a teaching biology site on the Internet. All plants need water, to use in photosynthesis and to help cool the plant. They take water in through their roots, and it moves up through the plant to the leaves through special tubes called XYLEM TUBES. Water is then lost through holes in the leaves called STOMATA. However, plants do not want to lose much water, especially those in dry conditions, so they have thick waxy outer layers (called cuticles) on their leaves. As the water moves up through the plant, it helps to keep the plant upright, because the vacuole in each of the plant's cells fills with water and becomes rigid. This is called "turgor pressure", as the vacuoles are said to be "turgid" when they're full of water. Water is taken up water and moves it around inside them by a process called OSMOSIS. ...read more.

Middle

* I then place 6 test tubes and label it 1-6 on the test tubes putting them into the test tube rack. * Using a measuring cylinder I measure out different amounts of glucose solutions and also distilled water by using a different measuring cylinder (fair test) mixing it into different amounts glucose solutions each time. Then pour into the test tubes. * I will put one potato in each test tube with the different amount of solutions and start my stopwatch. * After 1 hour, I will measure the length of potato by using a ruler and then the length will be recorded. * I will repeat the experiment exactly the same and it will give me total of two sets of results giving me an average of the two results. * Reasons For Method * I am using 7cm for my potato because from my preliminary work it shows me that I should use a longer piece potato, because it has larger surface area so increasing osmosis. * I am recording 6 results because I need to plot an accurate pattern for my graph in my obtaining evidence. ...read more.

Conclusion

During my experiment I felt my experiment went very well because I got no anomalous readings. My results were impressive because they agreed with my prediction and I managed to get a very good range of results on my graph. My method was good and fair because gave me good results and a fair test but I believe I could have improved it by: 1. Use a water bath because it would have kept the temperature the same to give better and more accurate results 2. Clean all the apparatus used to make it a fairer test. 3. Use a wider range of concentration levels to get more accurate readings and more of a curve n my graph. 4. I maybe could have used different solutions, which would have made the results of the experiment more accurate. 5. I could have used a different tester than potato maybe a plant of some type as from a plant easier to use the same plant for every experiment. Overall my experiment was successful because it agreed with my hypothesis which was " the higher the concentration level the smaller the potato chip will become the lower the concentration level the bigger the potato will become". I also have completed my aim and have got some good results from the experiment. ...read more.

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