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Osmosis

To investigate the factors that effect the osmosis in potatoes.

Osmosis is the movement of water through a semi permeable membrane, separating solutions of different concentrations. The water passes from a region of high concentration to a region of low concentration, until the two concentrations are equal in concentrations of water.

Many cell membranes behave as semi permeable membranes, and osmosis is a vital mechanism in the transport of fluids in living organisms, for example, in the transport of water from the soil to the roots in plants.

If a cell is in contact with a solution of lower water concentration than its own contents, then water leaves the cell by osmosis, through the cell membrane. Water is lost first from the cytoplasm, then the vacuole through the tonoplast. The living contents of the cell contracts and eventually pulls away from the cell wall and shrinks, this is known as Plasmolysis.

If you put a plant cell in water, water enters by Osmosis, then swells up. However, the cell will not burst. This is due to the fact that the cell walls are made from cellulose, which is extremely strong. Eventually, the cell stops swelling, and when this point is reached, we say the c


The sucrose concentration of the solution into which the potato tissue is placed affects to what degree it grows or shrinks. As you can see in the graph my results follow a very obvious inversely proportional trend. From this a firm conclusion can be drawn, if the amount of water in the test tube is greater than the amount of sucrose then the cylinder will increase in size and the more water, the more growth. The opposite is true for sucrose, the more sucrose, and the more the potato tissue contracts. Therefore the test tubes containing more water than sucrose produced an increase in the mass of the cylinders while in the test tubes in which the amount of sucrose was greater than the amount of water the potato tissue contracted.

Some topics in this essay:
Analysis Graph, Mass Length, Key Factor, Prediction Using, Introduction Osmosis, Concentration Mass, Average Length, Preliminary Experiment, 500 cm, potato chip, cm 500 cm, length cm, concentration water, cm 500, test tubes, potato chips, sugar solution, Osmosis Aim, 500 cm 500, solution potato, water potato, cm 510 cm, 500 cm 510, concentration water potato, Average Mass,

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Approximate Word count = 2752
Approximate Pages = 11 (250 words per page double spaced)


  

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