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# Does the concentration of sugar levels affect osmosis in potato plants?

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Introduction

Does the concentration of sugar levels affect osmosis in potato plants? Aim To find out whether the concentration of sugar levels affect osmosis in a potato plant. Introduction Osmosis is the passage of water from a region of low sugar concentration to a region of higher concentration through a semi-permable membrane. Osmosis can happen also in the reverse 'reverse osmosis'. Diagram Sugar solution Petri dish Potato bores Method First collect all apparatus. Carefully drill six bores in a potato and cut length way's circles, dab each slice dry. Weigh five disks till the total mass is exactly 3.2g, repeat the process six times and place five of the disks that's mass is exactly 3.2g into the six individual petri dishes. Pour 20ml of each of the six sugar concentration solutions into the dishes and place the top on the petri dishes, this will there fore stop evaporation happening. Cautiously place the petri dishes in a sheltered area and leave for one day. Finally repeat the experiment two more times and collect results. Prediction I predict from my understanding of osmosis, water should pass from a region of low sugar concentration to a region of higher concentration through a semi-permable membrane, in this case the two guard cells. ...read more.

Middle

Comparing to the gradient confirms that more weight was lost. The gradient for the 5% difference between 10-15% concentration is -33.0g/5% of solution. This definitely confirms significant decrease in mass. In experiment two 5.84g more is lost in the potato's inferring that more water is lost and therefore backs up my idea that reverse osmosis happens around 10% in the experiment. Between 5-10% in the second experiment no weight was lost, this could have been for a variety of reasons. While pouring solutions one of the solutions might have been contaminated with another, this could have occurred because the measuring cylinder was not washed out filled up before pouring measuring out another solution. Looking at the averages graph one can see there is a non- linear relationship on the line of best fit. The line of best fit is more curved on the averages graph. At the start of the averages graph there is a slower less steep curve indicating a slow, lesser decrease in weight between these points (5-10%) When looking at the gradient for this pint this is confirmed. Only -3.6g/5% of solution was lost between 5-10% in the experiment. ...read more.

Conclusion

Conclusion From my results I have find out that ' the higher the concentration of sugar in potato's, the lower the mass becomes' and vice versa. I have also proven my predication right. I predicted that the lower the percent of sugar in the solution the heavier the slices or total mass will become. This has been proven right my results I have gathered from the experiment, the potato began to lose weight as the solution percentage rose. This is because water has passed from a region of low sugar concentration to a region of higher concentration through the stomata. I also said I my prediction that the opposite would happen, that as soon as the percentage of sugar in the solution rose above 10 or 15% that the potato slices would lose weight. This is because the stomata has lost turgor pressure and has let water out through the pore. The water has moved in the reverse, water has moved from a region of high concentration to a region of lower concentration through the stomatal pore. Therefore the potatoes have lost weight. Looking at the results tables proves this, that ' the higher the percentage of sugar in the solution, the lower the mass becomes. Simon Novakovic Mrs LaBraca Science c/work Ecology ...read more.

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