• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

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

Extracts from this document...

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.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Green Plants as Organisms section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Green Plants as Organisms essays

  1. Marked by a teacher

    AN INVESTIGATION OF THE DIFFERENT SPECIES OF MAYFLY WITHIN THE POOL & RIFFLE

    4 star(s)

    Once I had identified the mayflies I had to make a tally chart on record sheet to keep a record of the number of each different species found in the pool. Once I had finished picking out the mayflies in the tray I had to pour the water with the invertebrates back into the stream.

  2. Marked by a teacher

    An investigation into the effect of a germination inhibitor on the germination of seeds.

    3 star(s)

    2 E 37.5 20.1 2 12.5 18 18 x2 = ? D2 = 37.5 + 20.1 + 2 + 12.5 + 18 + 18 = 108.1 E This figure is another high one that is not on the table. That means all of the final figures are much below 0.5,

  1. Mangrove Soil Analysis

    37.60 21.45 31.00 24.74 22.59 25.56 6. Mass of Water in Soil (3 - 5) 10.49 15.71 11.22 15.63 11.19 14.42 7. Percent of Water in Soil Mass Of Water (6) Mass Of Saturated Soil (3) 21.81 % 42.28 % 26.58 % 38.72 % 33.13 % 36.07 % Discussion: Field capacity is a measurement of the water-holding ability of individual soils.

  2. An investigation in to the effect of temperature on the release of pigment from ...

    simply be putting test tubes in a large beaker containing tap water - as the temperature of tap water is at around 20 degrees Celsius. I will have to wait for almost all of my temperature ranges to reach to its required temperature to enable me to perform the tests.

  1. An Investigation into Species Diversity with distance along a Pingo.

    Biotic factors include competition, density and predation. It also includes and amount of waste produced by the populations, however this is not really applicable to vegetation. Abiotic factors include temperature, light intensity, topography, and edaphic factors (moisture content, pH, depth, organic content and compaction).

  2. Potato and Osmosis Investigation.

    from the same potato, we left the chips to infuse individually in five separate beakers, each with a different concentration (varying from 1 molar - 34.2g of sugar to 0 molar - 0g of sugar) we shall go down by 25 molar each time to get clear results, the whole

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work