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

    Also the agar plates themselves where often moved. Considering that some of the solutions used where highly fluid this may have caused some of the solutions to shift. And hence some of the zones of inhibition may have changed. Some random errors also occurred. For instance the experiment was performed in a relatively public environment with dozens of

  2. 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.

  1. IB Genetic Unit Notes

    of movement in an electric field cause by a combination of their charge and their size. 4.4.3: State that gel electrophoresis of DNA is used in DNA profiling. Gel electrophoresis of DNA is used in DNA profiling. DNA profiling is also known as DNA fingerprinting and is used to compare DNA from different sources without mapping the entire genome.

  2. Should Animals have the same rights as Humans? Both animals and humans exhibit behaviours ...

    appear to taste the substances that the bower birds use on the walls. Since the males do not take part in the care of the young it is thought that the careful selection of the female only confers genetic benefit-that is, it improves the quality of her offspring.

  1. 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.

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

    for a longer period of time than the potato cubes cut just before they are placed into the test tubes. So, option 2 which contains a reasonable amount of 5 potato cubes and accurate results would be the best option.

  1. Rate of heat loss

    This means that it quickly conducts heat away from a body. Not only does this facilitate the heat loss due to faster conduction, but also it helps to maintain a steeper temperature gradient in between the body and its surroundings.

  2. Biology experiment. Investigating the effect of temperature on the surface tension of water

    Place beaker into the water bath and let it sit for about 15 minutes to adjust to the temperature 5. Place the 20 cent coin on the hot plate 6. After 15 minutes, check the temperature using the thermometer 7.

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