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To Investigate the Effect of Water and Sugar Solution of different Concentrations of the Mass of Potato Cylinders.

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To Investigate the Effect of Water and Sugar Solution of different Concentrations of the Mass of Potato Cylinders. PLANNING: Background scientific Information Potato Plants: The potato plant produces glucose through photosynthesis and stores it in the potato. The glucose is carried from the leaves where it is produced, down to the potato in the phloem where it is changed into starch to be stored. The Potato is part of the root of the plant and spreads out just below the surface of the soil, as shown in diagram 1 Diagram 1, The potato Plant Photosynthesis: Is the process where Carbon dioxide and water combine to produce glucose and oxygen. The glucose that is made is transported to the potato where it is changed into starch to be stored. Plant Cells: A typical plant cell: Diagram 2, Structure of a typical Plant Cell Cell Membranes: Plant cell membranes are selectively permeable, allowing only certain sized molecules to pass through it. It contains pores or holes, which are too small to allow some molecules to diffuse in or out of the cell, such as starch. Other molecules diffuse slowly through it because they must hit the membrane at the right angle, like glucose. ...read more.


And cut away and down form myself when using a scalpel. I will prepare the apparatus I will use in this experiment. This will consist of 1 molar sucrose solution, water, 18 potato cylinders, 18 test tubes, test tube rack, measuring cylinder, and scalpel. To make this test as fair as possible I will cut each potato cylinder down to 40mm using a scalpel. This will also remove the skin, which needs to be discarded in this experiment because we are only looking at the inner potato cells. When using the scalpel I will cut away and down from myself as to reduce the risk of cutting myself. I will also use exactly the same volume of liquid in each test tube. This will be 5 cm^3. I chose this amount of solution so that it covers the cylinder completely and uses as little as possible as not to waste it. I will also put every cylinder in its solution for 7 minuets 30 seconds to increase the fairness of this test. I decided on this time because it should be enough to have a noticeable change in the mass of the cylinders I will dry the cylinder before I weigh them, before and after the experiment to make sure no excess water is still on them. ...read more.


Method: Six potato cylinders were taken measuring 10mm in diameter from a potato. All of the cylinders were cut down to 40mm in length by cutting down and away to avoid injury by using a scalpel, so each cylinder was the same length. Each of these cylinders was dried and then weighed. These weighed cylinders were allocated a concentration of the solutions. This is so the mass before and after the experiment can be compared. These masses were recording in grams to two decimal places as 'Mass before experiment' in the result's table. Six test tubes were then taken and filled with 5cm different concentrations of 1 molar solution and water. These concentrations were as follows: 1. 1, 1 molar solution, and 0, water concentration 2. 0.8, 1 molar solution, and 0.2, water concentration 3. 0.6, 1 molar solution, and 0.4, water concentration 4. 0.4, 1 molar solution, and 0.6, water concentration 5. 0.2, 1 molar solution, and 0.8, water concentration 6. 0, 1 molar solution, and 1, water concentration then the allocated cylinders were placed in their allocated concentration and left for 7.5 minuets. They were then taken out and dried. The dried cylinders were weighed in grams and to two decimal places, these were recorded as 'mass after experiment' in the result's table. This exact same experiment was repeated two more times as to gain a reasonable average. ...read more.

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