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# Investigating Turgor in Potato Tissue.

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Introduction

Investigating Turgor in Potato Tissue Aim: - To see how concentration affects plant tissue. Variables Cross - sectional area of the potato tube - If the area of the cross section is bigger then there will be more diffusion and therefore more water being passed in or out of the potato tube because it is a bigger area. The amount of time left in the solution - The longer the potato tubes are left in the solution the more diffusion of water there will be. An example would be, if a potato tube where left in a solution for ten seconds compared to two minutes there would be more diffusion after two minutes. The concentration of the solution - The more concentrated the solution with sugar, then higher the rate of diffusion because the gradient is steeper. The length of the potato tube - The longer the potato the more osmosis that will take place, because there is more area for water to diffuse in and out of. The type of the potato - There are different types of potato that are grown in different conditions, so one that doesn't need to absorb as much water might give different results to one that absorbs lots of water. ...read more.

Middle

sugar solution and 5ml of water, 1 molar will have 10ml water and 10ml sugar solution, the 0.5 will have 15ml water and 5ml sugar solution, the 0.25 will have 2.5ml of sugar solution and 17.5ml of water and then finally the 0 molar will just have 20ml of water. Once both the potatoes and the solution are sorted out, three potatoes can be put in to each beaker. After every two minutes we will weigh the different tubes in each different solution. The stopwatch will measure the time. These are the different measurements and units for the experiment: - The length of the potato tube - 4cm The different concentrations of sugar solution - 0 molar, 0.25 molar, 0.5 molar, 1 molar, 1.5 molar and 2 molar. The time left in the solution - Every two minutes one tube will be removed, the other two will stay in the solution to keep the test as fair as possible, each tube will be removed to be weighed in rotation. The total amount of time that the tubes will be in the solution is 12 minutes The cross - sectional area of the potato tube - size goes here this is the size of the cork borer, because the ...read more.

Conclusion

Because of the cell wall the cell can't burst, but once it is completely full no more water can be passed into it. A flaccid cell is the opposite of turgid. When a cell is put into a concentrated sugar solution, water diffuses out of the cell, therefore making the cell shrink. When the cell is flaccid the cytoplasm has come away from the cell wall, this is called plasmolysis. Turgor in a plant is important because it holds the leaves up right and towards the sun enabling them to take in more sunlight. A plant only becomes flaccid when water is being passed out of the cell, because it is decreasing the pressure and so therefore it cannot stand up right. From the above knowledge I would expect to find that the potato tubes put into the 100% water concentration would gain the most weight because no water has had to diffuse out to equal the sugar solution, instead water has diffused into the cell so that it can become more turgid. Potatoes have shoots that grow above the ground and so the leaves of these needs to be turgid, so that they can receive the maximum amount of sunlight. ...read more.

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