Lab Report On Finding The Water Potential In Plant

1477 WordsDec 31, 20116 Pages
Biology Experimental report Title: | Finding the water potential in plant tissue | Date: | 30th November, 2010 | Aim: | To find the water potential of potato | Biological principles of the experiment Osmosis will occur if the water potential of the cytoplasm of the cells is different from that of the solution outside the cells. There will be no net water movement into or out of the cells if the water potential of the cytoplasm is the same as that of the solution outside the cells. The length or weight of the cells will not have any change. * Design Putting potato strips into sucrose solution of various concentrations and find out which concentration will not cause change in length or weight of the potato strips. | Change in weight | Change in length | Reason | Concentrated solution | Decrease | Decrease | Water leaves the cell by osmosis causing the cell to shrink | Dilute solution | Increase | Increase | Water enters the cell by osmosis causing the cell to expand | Solution with the same concentration as the cytoplasm | No change | No change | No net movement into or out of the cell | * Independent variable Concentration of the solution for the potato to put in is the independent variable in this experiment. It can be adjusted by diluting the solution to different concentrations. * Dependent variable The change in length or weight of the potato is the dependent variable in this experiment. To measure the change in weight, use a balance to measure the initial and the final weight of the potato strips. By subtracting the initial weight by the final weight to obtain the change in weight; to measure the change in length, use a ruler to measure the initial and the final length of the potato strips, subtract the initial length by the final one to obtain the change in length. Precautions: Keep the potato strips in covered Petri

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