Depending on your results, this will either be a straight line with a ruler or a smooth curve. This will show you how reliable your data is, as the smaller the error bar, the closer together and more reliable your repeats are. If you have put multiple sets of data onto one graph to show comparisons, you need to make sure that each data set is easily identified and there is a key to show which data is which.
Evaluation - Ea - evaluation of apparatus and procedures For this section, you need to describe limitations caused by your techniques and equipment. Talk about what problems you might have encountered not necessarily ones that actually happened, just what might have happened and explain what you could do to improve your work the next time. Think about better, more precise equipment, like electronic timing devices, laser measures and super accurate pipettes.
You can also use the section to discuss alternative methods that are available that can provide the same results with more accuracy. You need to say, for each point, why they would be an improvement. This has to be done in detail to get the top marks. If it helps, you can add diagrams or photographs of the alternative equipment. You can also justify why your method is the best one and that there are no realistic ways to make it any better. Evaluation - Eb - evaluation of primary data Identify any outliers you had in your results.
You need to talk about the general scatter of your results. Are they close together or far away?
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What dies this mean about the accuracy of your results? You also need to refer to your error bars. Small error bars mean increased reliability as all your repeats are close together. In turn this could be defined as water moving from a weak to a strong solution i.
Osmosis Potential In Potatoes Biology Essay
In plants cells water moves in and out of them depending on the concentration of the solution surrounding the cells. As plant cells have fully permeable cell walls this allows anything dissolved to pass through.
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The cell wall prevents too much water entering and in turn bursting due to osmotic pressure. When water moves into a plant cell the vacuole within increases in size and pushes the cell membrane against the cell wall. As a result, the force of the membrane pushing against the cell wall makes the cell wall turgid. In effect the osmotic pressure is responsible for keeping herbaceous non-woody plants upright.
The Effect Of Osmosis On Potato Cells
Plant cells which do not receive enough water results in wilting occurring therefore make the plant flaccid. During osmosis if a plant loses too much water it results in plasmolysis occurring.
If a plant cell was surrounded by a concentrated solution, with a lower water concentration than the cell this would result in the cell losing water by osmosis. This would be defined as hypertonic. If a plant cell was surrounded by a solution with the same concentration as the cell there would be no overall movement of water across the cell membrane.
This would be defined as being isotonic. If a plant cell was surrounded by a dilute solution, which would have a higher concentration of water than the cell then the cell would gain water from osmosis. This would be defined as being hypotonic. As osmosis is defined as the movement of water molecules across a partially permeable membrane from an area of high water concentration to an area of low water concentration, I predict that as the water concentration decreases in the potato pieces the overall mass and length will decrease too. As the sucrose solution concentration is increased the more obvious the change in mass and length will be in the potato piece.
I also predict that by the end of the experiment the potato piece in the distilled water 0M will weigh the most as in osmosis the water from outside the cells will enter the vacuole to dilute it as the cells have a stronger solution in them. Therefore the cells will become full of water and as a result will become turgid.
During the experiment, the small holes within the membrane of the potato piece will allow the water molecules to pass through in and out of solution and the potato piece.
A Biology Coursework: Osmosis
This depends on the concentration of the solution. In the 0 molar — distilled water solution, the water will enter the potato piece because it is of a higher water concentration than the liquid inside the cell of the potato piece. As a result the potato should increase in weight and length. This may also result in the potato piece becoming turgid as the solution surrounding the potato piece is of a weaker concentration. In the 0.
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This is because the concentration of the solution and the cell of the potato piece are very similar. I think there will be a small increase in weight of the potato piece. Although I do believe the result will only decrease by a small amount as the concentration of the solution and the cell of the potato piece are still quite close.
Osmosis Coursework Secondary Data – 768343
This is due to there being a higher concentration within the potato cell than of the sucrose solution. In the 1 molar concentrated sucrose solution, I think there will be the most visible change in weight loss of the potato piece compared to the previous 0. This is because the solution surrounding the potato piece is of a much higher concentration than within the potato cell, which results in more water entering the cell sap of the potato piece. There are also the proposed variables involved that will allow me to plan and explain the experiment carefully, they are outlined below:. The Independent variable: The independent variable is what I intend to change in the experiment, which in this case will be the concentration of each solution, as stated previously from 0 molar to 1 molar.
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