• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6
  7. 7
  8. 8
  9. 9
  10. 10
  11. 11
  12. 12
  13. 13
  14. 14
  15. 15
  16. 16
  17. 17
  18. 18

Biology Coursework Effect of Different Concentrations of Sucrose on Potato Tissues.

Extracts from this document...


Biology Coursework Effect of Different Concentrations of Sucrose on Potato Tissues AIM Aim of this experiment is to investigate and understand how diffusion process allows movement of molecules from one concentration of solution to a different concentration of solution. I will conduct an experiment by immersing a sliced potato in different concentration of sucrose solution and measure mass of the potato at intervals to see if diffusion has taken place. Potato is chosen because its cells contain starch (carbohydrates) within it. (This proof was obtained using iodine solution. The solution turned blue/ black in colour because there was starch present). Since sugar molecules are large the theory says it will take longer for the molecules to diffuse. This will allow us to see the diffusion take place both ways, into the cell and out of the cell. The results from this experiment will allow me to understand how chemical exchange takes place within living cells. This will provide me with the understanding of respiration process with in a cell takes place (Transfer of food and oxygen into cell and by-products like carbon dioxide and water out of the cell), how hormones such as insulin works within or body and how many other chemical processes take place in our body. BACKGROUND INFROMATION The theory of diffusion defines that molecules move from high concentration to a low concentration. In case of osmosis the definition is the movement of higher concentration of water to a lower concentration of water. ...read more.


This is to stop any possibility of any kind of contamination that could affect the experiment. PRELIMANARY WORK My potato had a diameter of 0.9 and were 5cm. however the mass was not constant though I was getting different mass however I tried to make the masses closer of the potato chips. These are the concentration of sugar solution I used. Volume of 1M of sugar concentration solution cm3 Volume of distilled water cm� Concentration of sugar solution (M) 50 0 1 37.5 12.5 0.75 25 25 0.5 12.5 37.5 0.25 0 50 0 These are my results had over 4 days with the altered concentration. Concentration of sugar solution (m) Mass (g) of potato on Day 0 Mass (g) of potato on Day 1 Mass (g) of potato on Day 2 Mass (g) of potato on Day 3 Mass (g) of potato on Day 4 0 2.93 1.72 2.12 2.15 2.25 0.25 2.94 1.83 2.15 2.1 2.14 0.5 2.95 2.2 2.3 2.14 2.31 0.75 2.93 2.9 2.9 2.78 2.7 1 2.96 3.45 3.08 2.57 2.53 My have drawn a graph to show both show the osmosis and diffusion takes place. From the graphs I can place. My graph shows that all the different concentrations had different affects on the mass of the potato. The potato in the most concentrated solution has the highest peck as osmosis had taken place and the water had mover from the high concentration to the lower concentration. ...read more.


The range of concentrations was adequate but I would possibly create more concentrations if I repeated the experiment so that I would have more varied results, i.e. 0.10m, 1.15m, 1.20m, and so on. This way would have allowed me to also find out the isotonic point far more accurately as the one that I estimated is very approximate. The cutting of the potatoes was the most difficult part of the experiment as although I was recording my results by mass, it could well have affected the surface area and so the overall rate of osmosis. If I were to repeat the experiment I would have possibly found a machine to cut the potato as it would ensure that all potatoes would be the same weight and dimensions. As well as the potato I could have found a more accurate way to measure out the solutions and to determine the molar concentrations. Perhaps I could have used a burette. This would ensure that I have an accurate amount of fluid in each test tube. There were some anomalies as well. This may have been caused when the potato chips were removed from the test tubes and dried I may well have dried some potatoes more thoroughly than others and so some would have more excess water, which would add to the mass. If the experiment was repeated I could find another way to dry the potatoes that would ensure that all were dried in the same way for the same time. Hina Raja 11TJ 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 Life Processes & Cells 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 Life Processes & Cells essays

  1. Marked by a teacher

    Investigating the effect of Sucrose Concentration on the Rate of Osmosis in Potato Chips.

    5 star(s)

    In this osmosis investigation, I will try to keep constant the factors that affect the rate of osmosis apart from the concentration of sucrose solution (and water) for this is what I am investigating through this report. I shall use potato chips from the same potato because it is presumed

  2. Marked by a teacher

    Photosynthesis Coursework

    4 star(s)

    Therefore, any inaccuracies in measuring the distances, i.e. if a distance was slightly different when doing the actual experiment from the distance at which I earlier measured the light intensity, an error would ensue. The second major inaccuracy was in measuring the volume of oxygen given off.

  1. Marked by a teacher

    Investigating the effect of sucrose concentration on osmosis in potato cells

    4 star(s)

    But the potato did not gain as much mass as in distilled water, because the water potential of the 0.2 M solution is lower than that of the distilled water, so not as many more water molecules moved across from solution to cell than from cell to solution, so the concentration gradient is smaller.

  2. Marked by a teacher

    An experiment to show osmosis in potato chips in different concentrations of sucrose solution ...

    3 star(s)

    * Cover the beakers with cling film preventing the solution form evaporating * Leave the potato chips in the solution for a minimum of half a day. * After leaving the potato chips in for half a day remove potato chips from beaker A and blot the potato chip dry

  1. Experiment to show osmosis in potato chips in different concentrations of sucrose solution - ...

    than the other there would be more space for osmoses to occur, therefore the test would not be fair. To make sure the test remains fair I will do all my experiments at room temperature, use the same type of potato, which will be kept at the same size and weight and have been treated in the same way.

  2. To investigate the effect of different concentration of sucrose on osmosis in potato chips

    Again we could do more concentrations, to resolve this problem and get more accurate data. This is again because, more concentrations would mean narrowing the concentration intervals down, and a more accurate plot of results on the graph. This would more likely give us a more accurate interpretation of where the concentration inside and outside the potato is equal, i.e.

  1. Osmosis, What is the effect of sucrose concentration on the rate of osmosis in ...

    50 ml Measuring Cylinders Measures the amounts of sucrose and water needed as stated in the concentration table 12 Test tubes Hold the sucrose/water and the potato cylinders during the experiment 1 Test tube Rack Holds the test tubes during incubation 1 Stopwatch Measures the time of incubation 1 Scalpel

  2. Osmosis Coursework. Investigation Of The Effect of Different Concentrations of Sucrose Solution on Potato ...

    out off the potato cells making them plasmolysed, resulting in the potato cylinder shrinking and becoming lighter in mass When the concentration inside the cell is the same of that in the sucrose surrounding the potato cylinder, osmosis will occur at the same rate entering the cells as the rate

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