An Investigation into the water relations of plant tissue.

potatoes to drain out to the surrounding sea water. This will cause the cells to become flaccid and, eventually, plasmolysed, making the potatoes squashy and undesirable to the customers of the shop.Prediction:My prediction is that the more sea water comes into contact with the potatoes, the more soft and squashy the potatoes will become.     This is due to the basic principles of osmosis outlined in the Introduction section.      For this experiment, we will be using dilute sucrose solution instead of sea water. This is because sea water may have other things in it which would affect the potato cells in other ways, and my only concern is the osmosis factor.       My prediction sketch graph is below.Safety:      The risks of this experiment would be a risk of harm to the person cutting the potatoes, as the blade is difficult to control after a small while and therefore to minimise this risk, the potatoes will be cut by all members of the group, ten each, to a specified length.  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 ConcentrationWe 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 chipsThis 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 tubeMust 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.Angle of tubeThis must be kept the same, or else the sucrose solution will not cover some and will cover others, causing tainted results.Pilot Experiment:The pilot experiment consisted of ten pieces of potato in the same sucrose concentration as the main experiment. The results were as follows:Chip          Solution          Weight before          Weight afterRack 1A                0%                   10.1g                     11.31gB                25%                 10.0g                      09.57gC                50%                 10.0g                      07.94gD                75%                 10.0g                      06.55gE               100%                10.1g                      03.99gRack 2F                12.5%              10.0g                      10.41gG                37.5%              10.0g                      08.74g H                62.5%              10.4g                      08.03gI                  87.5%              10.1g                      07.31g  J                 100%               10.1g                      03.46gResults:Make a results table. Include units, and all raw results.Use this outline, and add any columns / rows that you need.ChipSolutionWeight before [g]Weight after [g]A0%13.0013.99B0%13.0114.02C0%13.0014.00A12.5%13.0012.99B12.5%13.0012.98C12.5%13.0112.84A25%13.0012.68B25%13.0011.99C25%12.9911.68A37.5%13.0011.01B37.5%12.9810.98C37.5%13.0211.02A50%13.0010.65B50%13.0110.40C50%13.0210.36A62.5%13.0010.01B62.5%12.9909.97C62.5%13.0011.00A75%13.0008.79B75%13.0008.55C75%12.9808.88A87.5%13.0007.03B87.5%13.0306.97C87.5%13.0206.94A100%13.0004.98B100%13.0304.99C100%13.0305.02Graphs: 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: Page  of