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Throughout this coursework I will be looking into and experimenting Osmosis. Which will be present in the potato cells, which I am using as part of my experiment.

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Introduction

Introduction and Plan Throughout this coursework I will be looking into and experimenting Osmosis. Which will be present in the potato cells, which I am using as part of my experiment. I will be investigating osmosis, using potato cells, I will be testing to see the effect of osmosis differs in different concentrations of sugar and water. The Key factor of this experiment which is Osmosis based, is the Sucrose (sugar) solution and the concentration and the effects this key factor has on the Potato cells is important. The osmosis, which will be taking place, hopefully in my potato cells, is a special kind of diffusion. It involves the movement of water molecules from where they are in high concentration to where they are in a lower concentration. The way that plants get water into their roots is because the root hairs contain salts e.t.c so the water moves in from the surrounding soil. This tells us the soil has a higher concentration than the plant. I believe the water will move into the potato cells on some occasions depending on the concentration surrounding the potato, and it will on some occasions it will move out of the potato into the surrounding liquid. I will be able to tell from my results I will collect, whether the water has moved into the potato or out. Because if the water has moved in, it will make the potato heavier, and if the water has moved out surely the potato will be lighter. ...read more.

Middle

decrease 54.4% decrease 1m 3cm 2.5 Quite hard/ slimy 2.5 2.5 2.5 1.28 1.49 1.20 Very very soft 48.8% decrease 40.4% decrease 52.0% decrease Table to show average Lengths of potato. Original Length Final Length Average Final Length 0M 3cm 3cm 3cm 3.2cm 3.1cm 3.3cm 3.2cm 0.2M 3cm 3cm 3cm 3cm 3cm 3cm 3cm 0.4M 3cm 3cm 3cm 2.7cm 2.7cm 2.9cm 2.76cm 0.6M 3cm 3cm 3cm 2.7cm 2.8cm 2.8cm 2.76cm 0.8M 3cm 3cm 3cm 2.9cm 2.9cm 2.9cm 2.9cm 1M 3cm 3cm 3cm 2.5cm 2.5cm 2.5cm 2.5cm Analysis On the previous pages you can see the graphs I have drawn. The graphs show * Average final length * Original Mass * % Average change in mass From the graph, which represents Average final length I can see that the higher the sucrose concentration gets then the lower, the Average length seems to be. The graph has a positive correlation. There are a few results, which don't follow the sequence of a downhill average, but even these aren't anything for me to worry about as they do fit in with the results and experiment. These graphs that I have drawn do seem to support my predication, in that I predicted the higher the concentration, then the smaller and lighter the potato cells will turn out to be. These graphs do reflect my prediction, as the results for 1M are a lot lighter and smaller than the potato cells which have been but in 0M. ...read more.

Conclusion

Further experiments that I could carry out, could be to try the same experiment on different cells, plants e.t.c just to see how the results vary from the ones I have received over the period of gathering the results and carrying out the investigation. I believe I could have improved my experiment further, by using more accurate equipment. Carrying out more attempts per each sugar concentration, which would allow me to carry out a more in depth analysis, and I think would show up more abnormal results and results which don't quite fit in with the other results I have gathered. Conclusion From this experiment I have found out that osmosis is present in potato cells, and I found out that the water has a higher concentration than the potato as the water molecules moved into the potato, and made them longer in length and heavier. I conclude with, that the more concentrated a solution becomes then the smaller the cells will become as the water molecules move out into the surrounding area as it has a a lower concentration than the potato cells themselves. By Lucy Nicholson Table to show Average % change in Mass Concentration % Change in mass Average change in mass 0m 12% Increase 12+5.20+24=53.2 5.20% Increase 53.2/3= 17.73% increase 24% Increase 0.2m 3.60% Increase 3.60+1.20-0.09=4.71 1.20% Increase 4.71/3= 1.57% Decrease 0.09% Decrease 0.4m 31.6% Decrease 31.6+28.8+26.4=86.8 28.8% Decrease 86.8/3= 28.93% Decrease 26.4% Decrease 0.6m 35.2% Decrease 35.2+39.2+38.8=113.2 39.2% Decrease 113.2/3= 37.73% Decrease 38.8% Decrease 0.8m 48.4% Decrease 48.4+49.2+54.4=152 49.2% Decrease 152/3= 50.66% Decrease 54.4% Decrease 1m 48.8% Decrease 48.8+40.4+52.0=141.2 40.4% Decrease 141.2/3= 47.06% Decrease 52.0% Decrease ...read more.

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