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Testing the effect of sugar solution on osmosis in plant cells.

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Introduction

Testing the effect of sugar solution on osmosis in plant cells I am investigating to see the effect of sugar solution on osmosis in plant cells. The plant I am going to use is a potato. BACKGROUND KNOWLEDGE OSMOSIS-In normal diffusion, glucose molecules move, but sometimes with small holes they cant. This is the only time when the water moves through the membrane, this is called osmosis. In pure water, the potato tubes swell because water enters their cells by osmosis. In rich sugar solution, the potato tubes shrink because water leaves their cells due to osmosis. Osmosis is the movement of liquid from one solution through a special membrane into a more concentrated solution. The process is essential for the survival of living things. For example, plants absorb most of their water by osmosis. In animals, osmosis helps regulate the flow of water and nutrients between body fluids and cells. Industries reverse osmosis for such purposes as water purification and food preservation. ...read more.

Middle

MY PREDICTION I predict that the higher the concentration of the sugar in the sugar liquid, the lighter the potato will be. The size of the potato will decrease. I think this will happen because in pure water-with no added sugar the potato tubes will gain more water because their sugar levels be high, so more water will be required to level out the sugar and water in the potato and water cell. However in a rich sugar solution the potato tubes get smaller because the concentration of the sugar solution is high on the outside so the water leaves their cells, this is due to osmosis. This diagram shows us a part of the potato cell, and how osmosis occurs. There are more sugar particles on the outside so the water has to mix with it so there is an equal amount of sugar and water on both sides of the cell-in the solution and in the potato cell. However, if there were more sugar particles on the inside the water would have to go into the cell for osmosis to occur. ...read more.

Conclusion

in weights PURE WATER 40 mm 43.7 mm 9% 2.9 g 3.2 g 10% 5% SUGAR IN WATER 40 mm 41 mm 3% 3.4 g 3.6 g 6% 10% SUGAR IN WATER 48 mm 49 mm 2% 4.2 g 4.1 g -2% 15% SUGAR IN WATER 35 mm 34.8 mm -1% 3 g 2.9 g -3% 20% SUGAR IN WATER 40 mm 37.8 mm -6% 3.3 g 3.14 g -6% 25% SUGAR IN WATER 45 mm 41.6 mm -8% 3.4 g 3.4 g -8% From the table I can see that as the concentration of the sugar in the beaker increases the average lengths of the potato pieces left in that solution for 30 mins decreases but as the concentration decreases the length increases. I can also see that between 10g and 15g at 13g the result could be 0, this would be because the sugar levels in both the potato and the solution would be the same, therefore there would be no movement of particles. I did 5 tests so I could work out a reliable average. Mehjabeen Iqbal 10NDM ...read more.

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Here's what a teacher thought of this essay

3 star(s)

This piece of work is a good start to a practical write up: 1. The introduction is a good attempt and the referencing is good practice. 2. The variable, equipment and method sections are good, as is the use of a diagram to back up the prediction. 3. The results table is excellent. 4. Certain paragraphs need to be re-written to explain the key concepts of osmosis and to justify the prediction.

Marked by teacher Luke Smithen 18/04/2013

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