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

Surface Area to Volume Ratio Simulation Experiment. The comparison between surface area : volume ratio and time taken for agar blocks to decolourise.

Extracts from this document...


Data Collection Qualitative Observation Table 1.0 Observations on before, during and after experiment. Before experiment During experiment After experiment Agar blocks are dark brown in colour. Agar blocks slowly start to decolourise after putting in the dilute hydrochloric. The centre of the block is the last to decolourise. The agar blocks are light yellow. The smaller blocks appear to decolourise faster than the bigger blocks. Smallest block decolourise completely first. Biggest block decolourise lasts. Decolouration is slower as it approaches the centre. Quantitative Observations Table 1.1: Surface area, volume, and ratio of surface area to volume of the agar blocks. Agar block Surface Area/mm2 Volume/mm3 Ratio 1 600.0 1000.0 0.6 : 1.0 2 400.0 500.0 0.8 : 1.0 3 250.0 250.0 1.0 : 1.0 4 150.0 125.0 1.2 : 1.0 5 100.0 62.5 1.6 : 1.0 * To cut out the blocks of agar, a ruler is used. The uncertainty for a ruler is �0.5mm. * Agar block 1 is the biggest agar block while 5 is the smallest. Table 1.2: The time taken for agar blocks to decolourise for Trial 1, Trial 2, Trial 3, Trial 4 and Trial 5 Time taken for blocks to decolourise/s (�0.01s) ...read more.


Substances moves into the cell to be used as fuel for the reactions that occur within cell, collectively known as the cell metabolism. Products of these reactions (waste substances) need to be removed out of the cell in order for metabolism to continue. These two processes (substances moving in and out of cell) depend on the cell's surface area to volume ratio. This is due to the fact that the metabolic rate of the cell is directly proportional to the cell's volume, hence the chemical activity per unit time. On the other hand, the rate at which substances move in and out of the cell depends on the cell surface area. The chemical activity of a cell increase as the cell size increase, as more substances needs to be taken in and to be removed. As the cell increase in size, so will the volume and the surface area of the cell, but not to the same extent. As shown above, as cell gets bigger, the surface area to volume ratio gets smaller. This is proven when agar block 1 (the biggest agar block) ...read more.


and agar cubes can be places side to side on the white sheet. Thus, making it easier to note and record colour change. The stopwatch was not started directly after the agar cubes were places in the test tubes. Time of the agar cubes to decolourise will be shorter than it is supposed to. In order for it to be a fair test, place all the agar cubes in the test tubes and wait for 10 seconds before starting the stopwatch. Upon placing the agar cubes in the test tubes, some might take longer time than others. This is because, the agar cubes were placed one by one into the test tubes, instead of putting them all at once. Thus, the agar cube that was places first in the test tube will have a shorter time to decolourise compared to the others as the stopwatch was only started after the last agar cube is placed inside the test tube. Instead of preparing the HCl(aq) inside the test tube and then adding in the agar cubes, the opposite can be doen, i.e. placing all agar cubes in the test tube before adding HCl(aq). This is because less time will be lost as it is easier to transfer the HCl(aq) into the test tube due to its liquid state. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Biology 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 International Baccalaureate Biology essays

  1. Biology IA - Investigation of the relationship between surface area and volume using different ...

    Then, they were cut in half and the distance, diffused from the outer wall to the centre of the 'cell' was measured and recorded into the table 1. Table 1 Data after agar cubes were kept into NaOH(aq) for 10min.

  2. Modelling Surface Area to Volume Ratio in Cells with Agar Cubes

    The greater the surface area the larger the amount of raw materials that can enter at only one time. Each unit of volume requires a specific amount of surface area to supply its metabolism with raw materials. The amount of surface area available to each unit of volume varies with the size of a cell.

  1. The effect of toliet cleaning products on E-coli ...

    more effective than others. The most effective cleaner was the positive control of bleach. The products Duck, Harpic and home brand considering the standard deviation would fall largely in to the same range of effectiveness. King White however performed well above other toilet products and even rivalled the performance of

  2. Investigating Surface Area to Volume Ratio concerning the rate of Diffusion

    - Next, remove the agar cubes from the beakers and place them onto a dry surface. - Measure the penetrated part of the cube (pink color) with a ruler. Then calculate the percentage. - Record your results and repeat the procedure for the other agar cubes.

  1. Osmosis Experiment. This experiment is to consider how salinity influences osmosis in potato cells.

    But for all the experiments, if there is a short time limit, approximately 30 minutes or less, it would be wise to put 5 potato cubes per test tube because it will be faster. There is a large weakness to this option, as each potato cube's surface area will not

  2. Reaction Time

    of room for improvement.2 Reaction time drills are exercises focusing on making a person get used to react in a shorter time than they would actually have to in a real competition. 3 This kind of training seems to be a way to shorten the reaction time more than just being generally physical fit.

  1. cell theory summary

    This is an important feature of the biological system (compared to the non-living) that it is not just affected by the physiochemical laws but also by a genetic program. Theory reduction is the concept that theories and laws in one science field are simply special cases of theories which are to be found in the physical sciences.

  2. Genetics NOTES

    Alter the gene 3. Copy the gene 4. Reinsert the gene into another organism - DNA segments are not directly inserted into bacteria; circular pieces of DNA called plasmids are used - Altered plasmids may be put into bacteria, and the bacteria is grown to provide many copies of the introduced DNA - A gene probe is a

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