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An Investigation to determine the Water potential of Potato cells.

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Introduction

An Investigation to determine the Water potential of Potato cells Baldeep Bains Hypothesis and background information The cells that are to be used in this investigation will be of a white potato; parenchyma cells. These cells are large, thin-walled and usually have a large vacuole, which holds water, and are filled with sap, 'a solution of ions, sugars and enzymes capable of digesting proteins'. These substances are the solutes that will affect the water potential of the potato cells. Food storage in the form of starch grains is the main function of potato tuber cells. The plasma membrane that bounds a cell is partially permeable; it allows only small molecules such as water, to pass through. Potato cells also have cell walls; these have a rigid lattice structure but are freely permeable. Visit coursework fa in fa fo fa for fa more project fa Do fa not fa redistribute Osmosis is defined as the movement of water molecules from a region of higher water potential to a region of lower water potential through a partially permeable membrane.cofe fer sefefew orfe fek infe fofe fe; Water potential is a measure of the ability of water molecules to move from one region to another. The more water molecules there are per volume of the cell the more likely that by random movement they will collide with the cell's plasma membrane, and travel out of it. Pure water has a ?w of 0. As all solutions have less water molecules per volume than pure water they have a lower ?w, therefore all solutions have negative water potentials. The movement of water molecules is not entirely random. The net movement of water molecules is always from a region of high water potential to one of lower water potential. They move down a water potential gradient until equilibrium is reached. Equilibrium is reached when the water potentials on both sides of the plasma membrane are the same. ...read more.

Middle

Using glassware to hold solutions This project from www.coursework.info Glassware is easily cracked and cut glass can be very sharp and dangerouscoag agr seagagw orag agk inag foag ag. Take care when handling glassware and broken glasscoda dar sedadaw orda dak inda foda da! Using scalpel to cut potato and carrying it shayon, please do not redistribute this cours. We work very hard to create this website, and we trust our visitors to respect it for the good of other students. Please, do not circulate this cours elsewhere on the internet. Anybody found doing so will be permanently banned. Cutting hands or dropping it and cutting other people Marx oppressed shayon's functionalism . Use with caution, hold potato steadily and carry carefully with blade facing downcoed edr seededw ored edk ined foed ed. Using cork borer This paper from www.coursework.info Injuring hand by pushing cork borer into it.coga gar segagaw orga gak inga foga ga. Use with caution and push through potato onto hard surface e.g. tile. bbfymkQ Visit coursework dc in dc fo dc for dc more hypothesis dc Do dc not dc redistribute bbfymkQ Results The osmotic potential of different sucrose solutions can be calculated using the following formula: This paper from www.coursework.info ?? = -iCRT shayon, please do not redistribute this coursework. We work very hard to create this website, and we trust our visitors to respect it for the good of other students. Please, do not circulate this coursework elsewhere on the internet. Anybody found doing so will be permanently banned. Where i =b ionisation constant (1 for sucrose because it does not ionise in water)cofe fer sefefew orfe fek infe fofe fe. C = osmotic molar concentration (mole/litre H2O)coeb ebr seebebw oreb ebk ineb foeb eb; R = pressure constant ( handbook value R=0.0831 litre bars/mole oK)code der sededew orde dek inde fode de. T = temperature (oK)cogf gfr segfgfw orgf gfk ingf fogf gf. ...read more.

Conclusion

shayon, please do not redistribute this work. We work very hard to create this website, and we trust our visitors to respect it for the good of other students. Please, do not circulate this work elsewhere on the internet. Anybody found doing so will be permanently banned. The anomalous result could have been caused by a combination of these factors. Ym9Zp Visit coursework ef in ef fo ef for ef more writing ef Do ef not ef redistribute Ym9Zp To minimise significant sources of error an alternative balance could be used with a smaller error. This would increase the accuracy and reliability of the results. The temperature of the chips could also be kept constant. This would again increase the dependability and correctness of the results. Weber suppressed shayon's structuralism . More replicates would improve the procedure, ensuring that a single anomalous result would have less impact on the overall result; a more accurate average could be calculated. Also I think that leaving the potato chips in the solutions for a longer period of time e.g. 24 hours would increase the reliability of the results greatly.cofe fer sefefew orfe fek infe fofe fe; I think that the conclusion reached is relatively accurate. Even though I did obtain an anomalous result the rest lay on a smooth sigmoid curve, which intercepted the x-axis at a realistic point. I do not expect that the value obtained for the water potential of the potato cells is exactly accurate as there are many sources of error in the procedure and it is calculated from a freehand curve of best fit. Most of the sources of error are the same for all of the potato chips e.g. temperature, therefore they cancel out, meaning that the results obtained are reliable and as accurate as possible with the equipment that was available. The water potential of another potato could vary greatly therefore it is very difficult to calculate the inaccuracy of the results, however the trend of results is reliable and is as predicted.cocd ...read more.

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