• 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

Investigating the effect of osmosis on plant tissues.

Extracts from this document...


Investigating the effect of osmosis on plant tissues. Aim My aim for this investigation is to explore the effect of sucrose concentration on potato length. Background Knowledge My background knowledge was taken from a sheet I was given by my teacher on diffusion and osmosis also most of it has come of a teaching biology site on the Internet. All plants need water, to use in photosynthesis and to help cool the plant. They take water in through their roots, and it moves up through the plant to the leaves through special tubes called XYLEM TUBES. Water is then lost through holes in the leaves called STOMATA. However, plants do not want to lose much water, especially those in dry conditions, so they have thick waxy outer layers (called cuticles) on their leaves. As the water moves up through the plant, it helps to keep the plant upright, because the vacuole in each of the plant's cells fills with water and becomes rigid. This is called "turgor pressure", as the vacuoles are said to be "turgid" when they're full of water. Water is taken up water and moves it around inside them by a process called OSMOSIS. ...read more.


* I then place 6 test tubes and label it 1-6 on the test tubes putting them into the test tube rack. * Using a measuring cylinder I measure out different amounts of glucose solutions and also distilled water by using a different measuring cylinder (fair test) mixing it into different amounts glucose solutions each time. Then pour into the test tubes. * I will put one potato in each test tube with the different amount of solutions and start my stopwatch. * After 1 hour, I will measure the length of potato by using a ruler and then the length will be recorded. * I will repeat the experiment exactly the same and it will give me total of two sets of results giving me an average of the two results. * Reasons For Method * I am using 7cm for my potato because from my preliminary work it shows me that I should use a longer piece potato, because it has larger surface area so increasing osmosis. * I am recording 6 results because I need to plot an accurate pattern for my graph in my obtaining evidence. ...read more.


During my experiment I felt my experiment went very well because I got no anomalous readings. My results were impressive because they agreed with my prediction and I managed to get a very good range of results on my graph. My method was good and fair because gave me good results and a fair test but I believe I could have improved it by: 1. Use a water bath because it would have kept the temperature the same to give better and more accurate results 2. Clean all the apparatus used to make it a fairer test. 3. Use a wider range of concentration levels to get more accurate readings and more of a curve n my graph. 4. I maybe could have used different solutions, which would have made the results of the experiment more accurate. 5. I could have used a different tester than potato maybe a plant of some type as from a plant easier to use the same plant for every experiment. Overall my experiment was successful because it agreed with my hypothesis which was " the higher the concentration level the smaller the potato chip will become the lower the concentration level the bigger the potato will become". I also have completed my aim and have got some good results from the experiment. ...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 Exchange, Transport & Reproduction 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 Exchange, Transport & Reproduction essays

  1. Marked by a teacher

    Investigate the water potential of celeriac.

    5 star(s)

    The volume of solution in the test tube will also be a constant factor. The volume will be kept at a constant of 10ml.

  2. Marked by a teacher

    Biology coursework planning - the effect of lead chloride on the growth of cress ...

    5 star(s)

    of each cress seed in all five petri dishes. This is done using a ruler. The results for this test are shown in the table below. The average length of shoot of cress seeds was calculated once more, using the previous method - see appendix.

  1. Marked by a teacher

    Determining the Water Potential of Sweet Potato Tissue

    4 star(s)

    The total volume of solution needs to be the same for each sample because if there is more solution in one sample than the other then osmosis will occur faster as the distance between the two regions will decrease so this will not be a fair experiment.

  2. Marked by a teacher

    Osmosis. Aim: To find the molarity of potato tubers cell sap. BIOLOGICAL ...

    4 star(s)

    Therefore, the surface area of all the potato strips should be the same for our comparisons of the rate of osmosis to be accurate. If all the strips do not have the same surface area, some will get more access to the solution, while some strips will get less access.

  1. Marked by a teacher

    The Effect Of Temperature On The Permeability Of The Cell Membrane

    3 star(s)

    The control in this particular experiment will be the calibration of the colorimeter. This is due to the fact that the colorimeter reads the light absorbance. Therefore according to this the distilled water will be used to make sure that temperature is the only variable that will affect the final results.

  2. Osmosis in Potato cells

    As stated, when osmosis occurs and plant cells lose water, they become soft and are known as being "flaccid". In this case, the cell contents have shrunk and pulled away from the strong cell walls and the potato chip should feel softer to the touch, which is exactly what happened.

  1. Investigation on Osmosis using a potato.

    in the potato, and therefore the water should transfer from the water to the potato, making the potato bigger in size, and heavier in mass. The potato tissues, being surrounded by a weak solution, will be most likely to swell up and become turgid, taking in all the water it can possibly take in, also making it gain mass.

  2. This piece of investigative work aims to prove, through two different experiments: 1. the ...

    Filter paper was then placed on the weighing scales, and each sample was weighed in turn to determine its exact mass (correct to 0.001grams) so that once the experiment has been completed, a percentage mass gain or mass loss could be calculated.

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