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osmosis. I will be investigating the effects of different concentration of sugar solution will have on potato tissue.

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Introduction

Biology Coursework : Osmosis Plan I will be investigating the effects of different concentration of sugar solution will have on potato tissue. I will be doing an experiment to identify the effects of different concentrations of sugar solution on potato tissue different concentration of sugar solution a healthy potato to obtain the potato tissue and laboratory equipment. I will be analysing the results from the experiment to clearly see if there is a trend thus an effect. Then I shall do a conclusion concluding and summarising the information and my analysis to see if there is an overall effect. After, I will evaluate my means of obtaining the results (experiment). First, I am planning to collect all the equipment needed for my experiment: test tubes, potato corer, 3 potatoes, knife, 30cm ruler, a litre of 2 molar, sugar solutions, measuring cylinders timer 6 large beakers 150 ml of distilled water 1 board 1 pencil/pen 2 sheets of paper 1 electronic weighing scale Then I will construct a table to show my results. Like the one shown on the next page. I will then carry out checks to make sure my results are accurate by making the experiment fair. Method I will collect all the equipment needed for this experiment. I am going to placing a potato on a board. ...read more.

Middle

I will also wear clear goggles to avoid the sugar solution or any other utensils being exposed to our eyes. I will conduct the experiment 3 times, as this will ensure results that are more reliable and establish a clear trend. Method (cont.) and results I will then, pour the different concentrations of sugar solution into each test-tube and place a cored potato tissue and measure it and weigh it using a ruler and a scale and record the data results on the table. I will leave it there for less than 24 hours. I will take out the potato tissue, measure it, weigh it using a ruler and a scale, and record the results on to the table. I will then compare the results on the table and then put or show the results on a graph I will plot the points above the osmotic point if the trend or change is positive and vice-versa for negative (under osmotic point). I will then see and identify the trends more easily from the graphs. Preliminary work I already know that osmosis is a process when a substance (usually solutes) like sugar or salt dissolves in water, the solute attracts some water molecules, and they cannot move around thus decreasing the concentration of water molecules(look at fig 3 to understand). ...read more.

Conclusion

Using preliminary work, which I have done, will have improved my work greatly as in past experiments using a potato chip I have contaminated the solutions and distilled water with tap water, which contained minerals, and ions that could have faltered the results through active uptake. Also my preliminary results may have been more inaccurate as only carried out the experiment once and in this experiment I will repeat it 3 times to improve its accuracy. I had also left it longer then 24 hours where the work of the enzymes and other chemicals (fed by ions and minerals in tap water) may have altered the structure of the cell membrane thus affect osmosis directly. In addition, in that experiment I had also measured the variables for mass and this was more likely to produce anomalies as weight of extra water would have got on the scale if the potato chips hadn't been cleaned properly. In this experiment, I had included the variable, mass, this is because in preliminary experiments concerning osmosis, just keeping length, and analysing that variable in detail would not give me results that are more accurate. So by including mass as a variable, it will confirm a the trend suggested by length as they both support each other, as length increases with water in vacuoles, the water should add mass in itself in the vacuole. ?? ?? ?? ?? Shreenil Odedra 1 Biology coursework: osmosis ...read more.

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