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To Investigate water uptake by Plant Cells

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Introduction

Biology Coursework : To Investigate water uptake by Plant Cells 1. Introduction 2. Diffusion 3. Active Transport 4. Osmosis 5. Osmosis 6. Variables 7. Temperature 8. Size, Amount, Weight 9. Prediction, Bibliography [1][1] All plants need water to survive and I am going to investigate how plants uptake water by doing an experiment with potatoes and water to see how the potato uptakes the water and the different factors that effect the way it takes up the water. I am planning to investigate the uptake of water by plant cells. I am going to investigate the water in and out of cells. Water can move in and out of cells three different ways: - 1. Diffusion 2. Active Transport 3. Osmosis [2][2] 1. Diffusion Diffusion is the movement of any molecules from where there are lots to where there is less. Molecules diffuse down a concentration gradient from high to low concentration. Diffusion stops when the molecules are equal in concentration. The greater the difference in concentration, the faster the rate of reaction. Here are diagrams showing different types of diffusion: - Diffusion in water: - Substances pass in and out of cells as tiny particles called molecules. The molecules and liquids and gasses are never still. They keep moving and bumping into each other al of the time. You can show that molecules move by adding a drop of ink to water. Ink spreads through the water even though it is not stirred. Ink spreads because ink molecules move into the spaces between water molecules, and water molecules move into the spaces between ink molecules. Movement of molecules so that they mix is called diffusion. Molecules diffuse from where there are plentiful to where there are less plentiful. In other words molecules diffuse down a concentrated gradient from high to low concentration. Here is a diagram to show how the ink diffuses through all the water. ...read more.

Middle

Once this process is done the results will be recorded onto a table. 5 petri dishes will then be filled with sugar solution. All 5 being a different concentration. The dishes will be labelled D0, D0.5, D1, D1.5, D2 and put A in 0M of solution. B in 0.5M of solution. C in 1M of solution. D in 1.5M of solution and E in 2M of solution. Then using an electronic balance the weigh all 5 potato chips will be weighed separately and the weight of potato A B C D E will be recorded on a table of results. Once they are weighed one slice of potato will be placed in every petri dish with the lid of the dish put on so no dust or other substances can affect the experiment. The stop clock will then be started.( potato A in petri dish D0, potato B in petri dish D0.5 etc...). The experiment will be undertaken in room temperature to make sure the test will be fair. The potato will then be put into the solution and left there for 20 minutes. When the time has reached 20 minutes, the potatoes will be removed from the petri dish and patted dry with a paper towel. Making sure you still know which, potato is which potato. Another experiment needs to be done where the potato's are left in the solution for 2 hours. After this period of times the weight and length will need to be recorded. When the potato's are dry they will then be measured again and then weighed again, all this will be recorded on a table of results as it happens. This whole experiment has to be repeated at least once to make the results more accurate. The potato's will be labelled A1, B1, C1, D1, E1. And they will be on a different table of the same style. ...read more.

Conclusion

I feel that all the procedures that were taken out were done under great precautions of accuracy, one of the faults that did occur was that the timescale was a bit wrong, in the sense that we could not return to our experiment on the exact time that we were suppose to, this was because it clashed with other lessons. Another fault was the human error, because nobody is 100% accurate in the sense that reading off apparatus and measuring objects can never be 100% accurate. I do think that the evidence that we did record was at a good standard of accuracy and it does provide enough evidence to draw a final conclusion. My work proved that the concentration of the solution affects the direction of movement in water. This happens because water molecules move from a dilute solution to a concentrated solution. It also enabled me to form a valid conclusion about osmosis. A gain in weight occurs when every cell takes in water, therefore every cell gets larger and heaver. A loss in weight occurs when water leaves the cell to go into the solution. I feel that this project and procedure did need improvements in the sense that I feel we needed more time because it would mean that I could do more repeats of each sugar solution and therefore there would be an increase in accuracy which would enable me to obtain more conclusive results. Another improvement would be to split up the class into 2 groups to do the experiment at different times, this would increase space and make it easier to carry out the experiment satisfactorily. As it was I found it quite cramp and busy and this hindered me in carrying out my experiment. _______________________ [11][3] Deri Reed Chemistry Coursework Mrs. Sanders [12][4] Deri Reed Chemistry Coursework Mrs. Sanders [13][5] Deri Reed Chemistry Coursework Mrs. Sanders [14][6] Deri Reed Chemistry Coursework Mrs. Sanders [15][7] Deri Reed Chemistry Coursework Mrs. Sanders [16][8] Deri Reed Chemistry Coursework Mrs. Sanders [17][9] Deri Reed Chemistry Coursework Mrs. Sanders [18][10] Deri Reed Chemistry Coursework Mrs. ...read more.

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