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Biology investigation --- the effect of cubes taken at different distance from the centre of the root on the percentage increase in mass

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Introduction

James Fung 12thNovember,2002 Biology investigation --- the effect of cubes taken at different distance from the centre of the root on the percentage increase in mass Result Distance from the centre of the root /cm (x) Increased in mass / % 1 2 3 Average (y) 1 6.7 6.9 6.5 6.7 2 5.5 5.6 5.7 5.6 3 4.2 4.2 12.3 6.9 4 2.5 2.5 2.5 2.5 5 1.9 2.0 2.4 2.1 6 0.1 0.3 0.2 0.2 Fig.1 Analysis In analysis the result obtained, I have drawn out a graph, Fig.1, which show that the information that I got was almost a straight line. This implies that as the distance of cubes taken from the centre of the root increases, the percentage increased in mass decreases, by considering individual distance, a same sort of pattern appears. When those cubes are taken from 1 cm from the root, they have an average of 6.7% of increased in mass, those taken at 2 cm from the root increased by 5.6% while cubes taken at 4 cm from the centre of root have increased by 2.5% in mass. ...read more.

Middle

After active transport, the further in the cell is located, the lower the water potential it has, the higher concentration in the root means that the water potential is lower (more negative ) than the water potential in soil. Water movement is driven by osmosis travelling into the root cell. Now, bringing all the theory back to the experiment. When those cubes are taken out from the root, we expect the one which is the nearest to the centre of the root has the lowest potential while the one which is the further has the higher water potential. This means that when they are out into pure water, the lower the water potential of a cube, the more water it absorbs in a certain time interval. Evaluation In order to taken an average result, 3 values have been recorded throughout the whole experiment for each particular distance from the centre of the root. This is believed to be quite reliable. However, there are still sources of errors and limitations, which might have contributed to the inaccuracy. ...read more.

Conclusion

Put aside that sources of error mentioned, by referring to the table, it is pretty obvious to notice an anomaly in the results, which I have highlighted in red. Distance from the centre of the root /cm (x) Increased in mass / % 1 2 3 Average (y) 1 6.7 6.9 6.5 6.7 2 5.5 5.6 5.7 5.6 3 4.2 4.2 12.3 6.9 4 2.5 2.5 2.5 2.5 5 1.9 2.0 2.4 2.1 6 0.1 0.3 0.2 0.2 There is a general trend in decreasing in the percentage increased in mass down the column trial 1, 2 and 3 with the exception of 12.3%. and this has led to the abnormal average, which I have highlighted in blue in the table and circled in Fig.1. If I had a chance to do the experiment, apart from just trying to reduce all the possible errors leading to inaccuracy, I would instead make a prediction first and always bare the knowledge of water movement in mind. Whenever an anomaly comes across, repeat that particular distance and prove that the result is an anomaly by contradiction. The End P.1 ...read more.

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