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An Investigation into the water relations of plant tissue.

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Introduction

Christ the King School: Centre 34675 An Investigation into the water relations of plant tissue Name: Josh Bladen 11D Introduction: For my year 10 Biology coursework, I was asked to investigate Osmosis, and it's effect on foodstuffs, namely potatoes. Osmosis is the movement of water molecules from an area of high concentration in a dilute solution to an area of low concentration in a concentrated solution, through a partially permeable membrane such as a cell membrane. The problem I have been asked to investigate is a farmer's crop of standard white potatoes, on low level land near to the coast. I have been asked to show how much sea water flooding the crop can take before irreparable damage is done to the crop and it becomes unsellable. This damage would be caused by osmosis, as I have outlined above. Because the sea water is salty, it has less water in it than the water inside the potato cells, causing the water in the potatoes to drain out to the surrounding sea water. ...read more.

Middle

Controlled variables: In order to make this experiment a fair test, we must change only one thing and keep everything else the same. Sucrose Solution Concentration We must change this as it is the basis for our experiment. We will change it in 25% increments, but as we have 30 chips and are putting 3 in each tube, we must use ten tubes. So, the second rack will have increments of 25%, but will start at 12.5%, so as to show the differences between rack one values. Size of potato chips This must be kept the same in order to obtain accurate result. If the chips are oddly sized then the osmosis may act on the smaller, thinner chips with less water faster and thus spoil our results. Amount of solution in each tube Must be kept the same or else there will be tubes that had more solution will weigh less and the tubes with less in may not even cover the chips, causing them to weigh more. ...read more.

Conclusion

12.98 10.98 C 37.5% 13.02 11.02 A 50% 13.00 10.65 B 50% 13.01 10.40 C 50% 13.02 10.36 A 62.5% 13.00 10.01 B 62.5% 12.99 09.97 C 62.5% 13.00 11.00 A 75% 13.00 08.79 B 75% 13.00 08.55 C 75% 12.98 08.88 A 87.5% 13.00 07.03 B 87.5% 13.03 06.97 C 87.5% 13.02 06.94 A 100% 13.00 04.98 B 100% 13.03 04.99 C 100% 13.03 05.02 Graphs: Conclusion: Discuss your prediction, and osmosis. Talk about every part of the graph and what's happened. What about results that don't fit - including those in your table, not just the graph. Relate back to the original question about plants and sea water. It might seem like you're repeating some of the introduction - that's ok. A quarter of the marks are for the conclusion - don't skimp. If you need to add drawings to illustrate your conclusion, click a few returns to make space and draw them by hand on your print out. Evaluation: Josh Bladen 11D Page 1 of 4 ...read more.

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