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

Biology Osmosis Plan

Extracts from this document...

Introduction

Plan In this experiment, I will investigate the concentration inside a potato cell; through the process of Osmosis. This is the movement of water down its concentration gradient across a living cell membrane. Using certain concentrations of sucrose and water, I will discover, further, the concentration of sugar within a potato. To begin with, I will do a preliminary test. This will be to see the general outcome. Then I will note down the results and compare them with the actual results that I will do a week later. The variables in this experiment are: * Temperature should be controlled as osmosis works faster in higher temperature. I will keep the temperature the same at all times. I will therefore be doing all the experiment in one day, at one hour. * Surface area of the potato chip. This will need to be controlled as the different sizes may have different concentrations and will be an unfair test. To ensure this I will use the same size borer as the borers are of different sizes. I will also choose relatively same size potatoes. * Concentration of sucrose, which is the dependent variable in this experiment. This will be altered in order to complete the experiment. * Timing for experiment, if longer then I should expect to see a different mass change. ...read more.

Middle

I will take my potato chips and measure them using the measuring scale. I will make sure that each potato chip is the same mass as the others. If not I will cut them down to make sure that it is. 4) From this, I will go on to pouring the 20cm3 of sucrose into test tube 1. Then I will label this test tube, (using a marker pen and stickers) 1.0M. 5) Following this, I will go on to measure 15cm3 of sucrose and 5cm3 of distilled water using the measuring cylinder. I will pour each solvent into the test tube 2, and label this test tube as 0.75M. 6) From here I will measure 10cm3 of sucrose and 10 cm3 of distilled water, I will then pour these liquids into test tube 3, and once again label it as 0.5M 7) After doing that, I will measure 5cm3 of sucrose and 15cm3 of distilled water. Then I will label this test tube as 0.25M. 8) I will then measure 20cm3 of distilled water in the measuring cylinder and I will pour this into the test tube 5, and I will label it as 0M. 9) After this is complete, I will have my measurements and my chips, so all that will be left to do is to put the chips in the test tubes. ...read more.

Conclusion

Therefore, I think that by using extra persons then the experiment could have been more precise and accurate. In my experiment, there was only one anomaly and it was due to not drying out the potato properly and wiping the scale clean of the solution. To investigate further I would take different size potatoes with different masses but still using the same sucrose concentrations. This would prove the Osmosis theory further. As well as this I would also be inclined to try out a different potato and see the theory in that case, different potato in the sense of a different brand or a different make. This would be an interesting view at Osmosis. Other than that, I would also be interested if a new sugar concentration was introduced. This way I could find out if the theory works with different sugars and different potatoes. I would also investigate by trying the experiments in more detail. Using higher technology and more advanced equipment, to measure and to add concentrations. This would provide additional evidence to the Osmosis theory. Conclusion In an overall aspect my experiment was done with precision and accuracy. I have learnt that Osmosis is the theory that states a less concentrated will move to a higher concentrated solution. With the aid of further technology I think that the experiment could have been done more specifically. ?? ?? ?? ?? Biology Coursework Concentration inside a potato cell ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Molecules & 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 AS and A Level Molecules & Cells essays

  1. DETERMINING THE WATER POTENTIAL OF A POTATO TUBER CELLS USING THE WEIGHING METHOD.

    TABLE 3 DATA ON POTATO TISSU FROM A US SCHOLL WITH CORRECTIONS sucrose concentration /M starting mass of tissue /g final mass of tissue / g mass difference /g % change in mass 0.00 4.62 6.03 1.41 +30.52 0.20 4.50 5.32 0.82 +18.22 0.40 4.60 4.75 0.15 +3.26 0.60 4.78

  2. An experiment to find of the isotonic point of root vegetables cells in contents ...

    if another root vegetable is used it may have a different solute potential hence it will have a different isotonic point. This is why it is important to use the same root vegetable. This is important because by using a different root vegetable cylinder for the same root vegetable the

  1. To find out how different concentrations of sucrose solution affect the incipient plasmolysis of ...

    also a decrease in the molarity of sucrose solution theoretically will cause an increase in the mass and length of the different root vegetables. All my graphs show a continuous trend, they all show a negative correlation. The trend is as the molarity of the sucrose solution increases the percentage

  2. An experiment investigating the concentration of sucrose in cells of carrot and potato

    In my real experiment I will use five different concentrations of sucrose solution and use three vegetable cylinders in each for a more accurate result. Hypothesis Taking into account my preliminary experiment and also my research into osmosis, I have come to the conclusion that the potato chip in a

  1. Experiment to investigate the water potential of potato tissues when immersed in various sucrose ...

    At the point of incipient plasmolysis, water potential is equal to solute potential and thus, the water potential of the solution = -1280 kPa. The results do not appear to have produced any anomalous values thereby suggesting that the method used to carry out the experiment was sound.

  2. A Level Biology revision notes

    Strong bonds found in skin and hair * Denaturation o Destruction of tertiary structure, can be done by heat o Protein structure is lost and cannot reform � dysfunctional * Background Reading: Structure of Proteins http://www.chemguide.co.uk/organicprops/aminoacids/proteinstruct.html Digestion * Large molecules (starch, proteins, TAG)

  1. Investigating Osmosis.

    To conclude, therefore, the results support our hypothesis, and we were also able to discover the approximate concentration of the sap in the cell. Evaluation Although the results of the sodium chloride and sucrose experiments support the hypothesis, there are several anomalous results and a large deviation for each result.

  2. Investigating Osmosis.

    because the high concentration is now inside the cell and so the water molecules would want to diffuse out of the cell. As the water is leaving the cell, the cell would shrink and therefore decrease in mass. As the cell would lose water it will get flaccid and it would expand slightly so that the length would increase.

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