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

Osmosis and Plant Cells.

Extracts from this document...

Introduction

David Biagioni Osmosis and Plant Cells. In this experiment I intend to look at how osmosis affects plant cells. The aim of this experiment is to investigate the movement of water into and out of plant cells by osmosis. The cells chosen for study will be potato strips. A definition of osmosis from 'Britannica Encyclopedia' is: "the flow of water by diffusion through a differentially permeable membrane from areas of high water concentration to regions of low water concentration." I plan to investigate this phenomenon using the methods expressed below: My Procedure For this experiment I plan to cut out eighteen thin strips of potatoes of uniform size. I shall measure these out using a vernier calliper and then cut them as accurately as I can, using a scalpel. Now I shall put six test tubes into a test tube rack. I shall label these with sticky labels to show what solutions they shall contain. The solutions I shall use in strength of molars are: 0, 0.2, 0.4, 0.6, 0.8, and 1.0. I shall then measure out the solutions for each test tube using a burette and pied pump. Each test tube shall contain twenty ml of the selected solution. ...read more.

Middle

Length after 1200 seconds in the solution (mm) Increase / Decrease in length (mm) 20ml of 0.0 Molar Sucrose Solution 40.00 41.50mm 1.50 increase 20ml of 0.2 Molar Sucrose Solution 40.00 40.50mm 0.50 increase 20ml of 0.4 Molar Sucrose Solution 40.00 40.74mm 0.74 increase 20ml of 0.6 Molar Sucrose Solution 40.00 36.50mm 3.50 decrease 20ml of 0.8 Molar Sucrose Solution 40.00 36.07mm 3.93decrease 20ml of 1.0 Molar Sucrose Solution 40.00 35.12mm 4.88 decrease Set two of results Solution (Molar) Initial Length of Potato Strip (mm) Length after 1200 seconds in solution (mm) Increase / Decrease in length (mm) 20ml of 0.0 Molar Sucrose Solution 40.00 42.47mm 2.65 increase 20ml of 0.2 Molar Sucrose Solution 40.00 40.69mm 2.50 increase 20ml of 0.4 Molar Sucrose Solution 40.00 40.68mm 1.04 decrease 20ml of 0.6 Molar Sucrose Solution 40.00 36.18mm 1.84 decrease 20ml of 0.8 Molar Sucrose Solution 40.00 35.63mm 3.05 decrease 20ml of 1.0 Molar Sucrose Solution 40.00 36.10mm 4.02 decrease Set 3 of Results Solution (Molar) Initial Length of Potato Strip (mm) Length after 1200 seconds in solution (mm) Increase / Decrease in length (mm) 20ml of 0.0 Molar Sucrose Solution 40.00 41.31 2.65 increase 20ml of 0.2 Molar Sucrose Solution 40.00 40.89 2.50 increase 20ml of 0.4 Molar Sucrose Solution 40.00 40.41 1.04 decrease 20ml of 0.6 Molar ...read more.

Conclusion

This would make it hard to get a correct measurement to decimal points of a millimeter. During the measuring and recording of the results there could have been some lack of accuracy. Due to the fact that the potato chips were not weighed, but just measured so they're mass could have varied indefinitely. I also believe that carrying out the experiment in more controlled conditions would have increased the accuracy in the results. I believe that to gain a set of more accurate results, you would need eighteen people. This many people would be needed so that the potato strips could be measured simultaneously. I also think that using a wider range of concentrations could improve the reliability of the results. This is because there would not be a large space between results, there would a wider range of results and I would predict that these would produce a more accurate set of results and conclusion. To make this experiment and my results more accurate and reliable, there are a few things that I could carry out. These things would be: - Use a wider range of concentrations, to give a wider range of results. If I could do it again I would use 0.05 molar gaps instead. Carry out the experiment in controlled conditions. Ensure an equal starting length and weight for each potato chip. ...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

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

    4 star(s)

    I will do this by adding the right amount glucose in 1 litre of water. I will then wash the Petri dishes and dry them. Then using a No. 5 cork borer, I will cut out 20 potato strips. To do this, I will place a potato on a board and push the borer into it.

  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.

    weight should decrease or increase, not noticeable for us to observate efficiently. But because of such high molars of sucrose, the water can diffuse all the way, throughout the two substances, equalling the concentration gradient of the two substances. If this experiment was accurate enough then there will be no

  2. Investigating osmosis on swede cells.

    As the protoplast continues to shrink it begins to pull away from the cell wall. This process is called plasmolysis and a cell is then said to be plasmolysed. Both the solute molecules and the water molecules of the external solution can pass through the freely permeable cell wall, and

  1. Investigating Water Potential Of Potatoes.

    Label the remaining 5 test tubes with the following categories using a chirograph pencil. * (2nd)1 molar, * (2nd)0.5 molar, * (2nd)0.2 molar, * (2nd)0.1molar, * (2nd)distilled water, 3. Use the following table and a measuring cylinder to make the sucrose solutions and pour them into the appropriate test tubes.

  2. Design an experiment to investigate the effect of temperature on the movement of a ...

    Repeat steps 10-13 with the test tubes in each of the water baths. 15. Repeat the experiment 3 times so that I can find the average of my results for each temperature making my experiment more accurate. Safety * I will be careful when using the scalpel because it is sharp.

  1. What is the isotonic point of a plant cell?

    be done exactly the same way except that I will use the red potato instead of the white one. Step 1. I will peel the potato and used the chipping machine to cut it into chips. Step2. I'll then marked a line straight across the cutting mat with the pen

  2. Investigation of water potential in plant cells.

    lower water potential inside of the carrot cells than outside of them and since water moves from an area of higher water potential (the solution surrounding the carrot) to an area of lower water potential (the carrot), the carrot cells will gain water.

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