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The effects of osmosis in plant tissues

Extracts from this document...

Introduction

Mikhael 2nd GCSE Boukraa Biology COURSEWORK The effects of osmosis in plant tissues PLANNING: This experiment will entail the observation of osmosis on plant tissues. The plant used will be a cucumber, cut into thin slices. The cucumber slices will be placed into sugar solutions of varying concentration over a period of time. Then the cucumbers will be once more observed and any changes recorded. Osmosis is the movement (diffusion) of water from where there is a high concentration of water molecules to where there is a low concentration of water molecules through a semi permeable membrane i.e. the cell wall. Plant cells contain a mixture of water and glucose solution. Therefore when the cucumber slice is immersed in pure water, the water molecules from the water bath will diffuse into the cells of the cucumber. As more sugar is added into the solution, less water molecules will diffuse into the cells as the concentration difference decreases. There will come a point where there will be no net movement of water, this is when the sugar concentration inside the cell is the same concentration as the solution outside. ...read more.

Middle

mass after immersion in solution(g) change in mass (g) Percentage change in mass % Average of A and B % 0 A 0.91 1.17 0.26 28.57 25.79 B 1.00 1.23 0.23 23.00 0.1 A 0.83 0.95 0.12 14.46 15.70 B 1.24 1.45 0.21 16.94 0.2 A 0.82 0.88 0.06 7.32 8.13 B 1.23 1.34 0.11 8.94 0.3 A 1.61 1.68 0.07 4.35 5.64 B 1.73 1.85 0.12 6.94 0.4 A 1.43 1.55 0.12 8.39 7.14 B 1.36 1.44 0.08 5.88 0.5 A 1.01 1.15 0.14 13.86 12.44 B 1.27 1.41 0.14 11.02 2nd experiment sugar solution (M) original mass of cucumber (g) mass after immersion in solution(g) change in mass (g) Percentage change in mass % Average of A and B % 0 A 0.82 1.29 0.47 57.32 46.84 B 0.88 1.2 0.32 36.36 0.1 A 0.88 1.2 0.32 36.36 28.82 B 0.94 1.14 0.2 21.28 0.2 A 1.46 1.66 0.2 13.70 10.80 B 0.76 0.82 0.06 7.89 0.3 A 2.34 2.46 0.12 5.13 9.34 B 1.55 1.76 0.21 13.55 0.4 A 1.84 1.55 -0.29 -15.76 -1.86 B 1.66 1.86 0.2 12.05 3rd experiment sugar solution (M) original mass of cucumber (g) mass after immersion in solution(g) change in mass (g) ...read more.

Conclusion

but this is an independent variable and can not be accounted for contributing to the anomalous results. The experiment could have been improved by using a wider range of sucrose solutions, by measuring the amounts of water and sugar in the solution more precisely, by trying to keep the size and masses of the cucumber slices similar because the surface area of the slice might have an effect. Also more precise timing of the slices in the solution would be necessary to make this experiment more precise. The third experiment was the most reliable considering it did not have many anomalies and it fit the hypothesis correctly. It was also done having experienced what went wrong in the last two experiments and corrected those faults. As far as repeats are concerned, enough repeats of the same sucrose concentration were taken to make the results credible. Further relevant work could include an experiment using the same method as this one but replacing the cucumber slices with another plant tissue such as an onion or using carrot slices or chunks. Also, the experiment could have been conducted using a wider range of solutions or over a longer time period. ?? ?? ?? ?? 2 ...read more.

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