Bio By filling dialysis tubing with different concentrations of. When viewed under the microscope, the.
The options are to create 4, 5 or 6 replicates.
Essay Writing Guide. Biology Internal Assessment IB Biology- Internal Assessment Lab Report * Osmosis experiment- Solanum tuberosum (Potato) Research Question: What is the effect of different concentration of salt solution on the rate of osmosis in solanum tuberosum (potato)? Hypothesis: The potato will lose weight and become shrank when. Osmosis in Potatoes The following experiment is a fun and easy way to see the effects of plant osmosis on a plant by comparing two different potatoes placed in. Osmosis Potato Lab Report Biology 4u Essay Words | 9 Pages. Introduction The movement of water molecules across a semi-permeable membrane is the process of osmosis.
Each of the options has different strengths and weaknesses. The biggest factors are about the amount of potato cubes to be used per investigation and how many potatoes per test tube. If the experimenter only cut a few pieces of potato per investigation, option 1 it lacks in the accuracy of results.
On the other hand, if the experimenter cut many potato cubes, option 3 it would take a long time and thus, there would be a slight difference in the first and last potato cube due to the uncontrollable variables, such as moisture and temperature changes, affecting the primarily cut potatoes for a longer period of time than the potato cubes cut just before they are placed into the test tubes.
So, option 2 which contains a reasonable amount of 5 potato cubes and accurate results would be the best option. But for all the experiments, if there is a short time limit, approximately 30 minutes or less, it would be wise to put 5 potato cubes per test tube because it will be faster.
But there is also an upside to this choice. Not only will it be time efficient, all the potatoes will be in the exact same volume and concentration of salt water. The independent variable is the salinity concentrations in the water.
This states that the control experiment is no salt, just a 1cm x 1cm x 1cm potato cube in 15ml of plain water for 20 hours. Keep all variables the same except for the independent.
If it was too less, the whole potato may not be fully covered Osmosis experiment solanum tuberosum (potato essay the salt water and if the volume of water is too large, when the potato cube is put into the test tube, it may cause the water to spill.
Thus, if a test tube holds 25ml, 15ml would be an appropriate volume for this experiment. The time the potato cubes are in the test tubes There should be 20 hours from the start until the end of the experiment for all the investigations.
This may be enough time for the osmosis process to start. Size of the test tubes There should be 5 test tubes if there is a short time limit and 25 test tubes if there is no time limitall the same size in order to achieve accurate results from the experiment.
Each test tube should be able to hold a 1cm x 1cm x 1cm potato cube and 15ml of salt concentrated solution. Place This experiment should be conducted indoors to reduce the number of uncontrolled variables. If this experiment was conducted outdoors, it would increase the risk of bugs, weather danger and the temperature change would be wider.
As a consequence the results would not be as accurate as conducting the experiment indoors. Type of potato The best method to control the type of the potato is to use just one potato.
Size of potato cubes Try and equally cut 1cm x 1cm x 1cm potato cubes. Collect the all the apparatuses to start the experiment. Gather everything on the list above.
Once all the apparatuses are ready for use, stab the corer into the potato several times. Cut the potato strands into measurements of 1cm by 1cm using a scalpel 4.
After 25 potato cubes have been cut, measure each one of them using a measuring scale so that they are all the same weight. Record the weight of each potato cube. Pour 15ml of diluted water using a measuring cylinder for 5 test tubes.
Repeat this process but using a different concentration each time. Place a piece of potato into each test tube. Leave the experiment for 24 hours. Come back to the place where the experiment was conducted and take the potato pieces out of the test tube one by one.
Briefly wipe each potato piece before measuring each potato cube Once you measure a potato piece, using the measuring scalerecord the result, and then move to the next potato piece out, etc.
Once all the data is recorded analyse the results. Experimental Set Up 1 No time limit The diagram above shows how this experiment could be set up.
This experiment is set indoor to reduce the number of uncontrolled variables affecting the investigation. Try and place the experiment in front of a wall rather than a window, to reduce the difference in light intensity and temperature.
The experimenter should label each investigation on the test tube rack to decrease the risk of getting confused. Experimental Set Up 2 Short time limit This diagram on the left shows another way this experiment could be arranged.
Try and keep the test tubes all in the same position to reduce the risk of an uncontrolled variable effecting a single investigation. There are a total of 50 measurements 2 measurements, before and after, for each potato cube.
The reason as to why the mass of each potato cube is different is because they were cut by the experimenter using the naked eye and a ruler, thus it is impossible for the masses to all be exactly the same.A potato (Solanum Tuberosum) contains 92% water, which is an osmotically active component.
The precise osmotic potential of sweet potatoes is however unknown. The osmotic potential of sucrose is know to be at 20 oC, the osmotic potential of sucrose is MPa2. When carrying out the experiment I used a range of 0, , , , and 1 molar solution to see the effect of osmosis in the potato pieces.
In the future I would like to have more varied range of the concentration of the solution in order to produce a more varied range of results i.e. 0, , , What is the effect of osmosis on the mass (g) of solanum tuberosum L. (potatoes) after duration of 24 hours in varying concentration levels (2%, 5%, 10%, 20% and 25%) of sodium chloride (table salt)?
HYPOTHESIS Solanum tuberosum L. final masses will decline as the concentration (2%, 5%, 10%, 20% and 25%) of sodium chloride increases. A potato (Solanum Tuberosum) contains 92% water, which is an osmotically active component.
The precise osmotic potential of sweet potatoes is however unknown. The osmotic potential of sucrose is know to be at 20 oC, the osmotic potential of sucrose is 2. MPa2. The Effect of Osmosis on Potato Cells Essay. In this experiment I am going to investigate the effect of varying concentration of a differing glucose solution on the amount of osmotic activity, between the solution and a potato tuber of a given size.
Osmosis Potato Lab Report Biology 4u Essay Words | 9 Pages. Introduction The movement of water molecules across a semi-permeable membrane is the process of osmosis.