Investigating the Effect of Different Solutions on Plant Cells

Investigating the Effect of Different Solutions on Plant Cells
The aim of my experiment is to find the effects of different solutions on plant cells. Osmosis is a form of diffusion, the movement of molecules to allow them to mix, which occurs in plants. When a cell containing a weak solution is next to a cell containing a stronger solution the water in the weaker solution moves towards the stronger solution. This is why I think that the pieces of potato in the concentrated solution will decrease in both weight and length. However, I believe that the potato will do the opposite and increase in length and weight. I cut 15 identical pieces of potato, measured and weighed them, and placed 3 in 0.25mol/l 3 in 0.50mol/l 3in 0.75mol/l 3 in 1.00mol/l and 3 in water inside a test tube. I ensured that each test tube had 10ml of liquid surrounding the potato. I gave it 3 days before weighing and measuring the potato again to see the difference.
The reason behind putting 3 pieces in the same level of concentration was to ensure a fair test. I will ensure that amount of solution and length of potato is the same because if they are different it will spoil the results of the experiment. More concentration could cause weight differences and length of potato could make it absorb more or less concentration than other pieces depending on the difference in size. To ensure they are the same I will use a measuring cylinder to measure the amount of concentration I pour into each of the test tubes and I will measure the potato as accurately as possible. The equipment I will require is: 15 test tubes 2 test tube racks A measuring cylinder 15 pieces of potato 30ml of each concentration A ruler Scales. These were my results for length. concentration initial length average final length average difference mol/L 0.25 2 2 2 2 2 2.2 2.1 2 0 0.50 2 2 2 2 2.2 2.3 2.1 1.8 -0.1 0.75 2 2 2 2 2 2.2 2.1 1.8 -0.2 1.00 2 2 2 2 2 1.9 1.8 1.7 -0.3 Water 2 2 2 2 2 2.2 2.2 2.3 0.3 These were my results for weight concentration mol/L initial weight average final weight average difference 0.25 0.63 0.62 0.68 0.64 0.47 0.96 0.6 0.84 0.2 0.50 0.61 0.66 0.39 0.65 0.6 0.62 0.63 0.62 -0.03 0.75 0.6 0.61 0.65 0.62 0.54 0.50 0.51 0.53 -0.09 1 0.65 0.55 0.65 0.62 0.51 0.48 0.55 0.50 -0.12 Water 0.50 0.64 0.47 0.5 0.55 0.56 0.47 0.54 0.04 [image] My prediction was correct and the graph shows how the difference is decreasing between initial and final lengths and weights. I think that the method I used was good as it was a fair test and all results were similar. I got a few odd results, which I think I could have avoided had I been more accurate. I think the work I have produced is enough to show the results of osmosis as I have repeated the test 3 times and they all have similar results.

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