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Ukraine: Population crisis. Purcell Consulting Company is world's foremost
independent consulting company regarding policy issues ...
Ukraine Population Crisis. Biology Coursework - Osmosis Aim: The aim of this
investigation is to discover the concentration of sugar ...
... Azerbaijan, Georgia on the South; and the Black Sea, Ukraine, Belarus, Latvia ... The
country is currently experiencing a population crisis, as the growth rate is ...
... geologists anticipate an oil supply crisis sometime within ... The world's burgeoning
population is dependent on food ... Chernobyl cleanup have died in the Ukraine. ...
... million people (31 percent of the population), which were ... in 1997 resulted in the
financial crisis in 1998 ... Surzhyk (has Russian and Ukraine features), Trasianka ...
Submitted by NickT1980 on March 1, 2007
Category: Science
Words: 2640 | Pages: 11
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Biology Coursework - Osmosis
Aim:
The aim of this investigation is to discover the concentration of sugar within the cells of potatoes.
Prediction:
Osmosis is the net movement of water molecules in cells from a high to low water potential through a partially permeable membrane as shown below.
In plants, when a cell has a high water potential and contains a lot of water is known as turgid. Cells with low water potential and less water are known as plasmolysed. They have the appearance of being sunken and smaller where as turgid cells are swollen and fat as shown below.
In this investigation I will be using osmosis in the cells of potatoes and attempting to discover the concentration of sugar in the cells of the potatoes. I hope to achieve this by placing the potatoes into solutions of sugar and water of known concentration. This will enable me to view how the potato cells change while they carry out osmosis, wether they lose, gain or retain the same mass. I will be using 5 different sugar solutions of 0% (pure water) 5%, 10%, 15% and 20% sugar. Because I know that the solution inside potato cells is not pure water and contains at least some sugar I expect the potato placed into the pure water to gain mass because the pure water has a higher water potential and will travel through the potatoes partial permeable membrane by osmosis and the mass of the potato will increase. This is shown in the diagram below.
However, I doubt that the unknown solution inside the potatoes is stronger than 20% because potatoes are not sweet tasting and they would be if the cells had a 20% sugar concentration. Therefore I expect that the potato placed in the 20% sugar solution will decrease in mass because it will have a higher water potential than the strong sugar solution it is placed into therefore the net movement will be from potato to solution and osmosis will...
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