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

The determination of the water potential of potato tissue.

Extracts from this document...

Introduction

EXPERIMENT REPORT --The determination of the water potential of potato tissue Introduction: This experiment involves the use of different sucrose solutions with different concentrations, in order to measure the water potential in a chosen potato. The theoretical background is the osmosis in plant cells: a plant cell loses water by osmosis if it is in a more concentrated solution (which has a lower water potential) than the cell's cytoplasm and vacuole. Reversely, a plant cell absorbs water by osmosis if it is placed in a solution of higher water potential. Hypothesis: The difference of water potential between the cell's cytoplasm and vacuole and the surrounding solution causes water to enter or leave the cell, resulting the change of the tissue's mass. ...read more.

Middle

3. Put the samples into six test tubes containing the six different solutions and wait for 30 minutes. 4. After 30 minutes, take out the samples from the test tubes. Blot dry and weigh again, mark down their weight as ' Second weight'. Variables: Dependent variable: changes in mass of potato slides Independent variable: range of solutions Other variables needed to be controlled: size of slides (4 to 5 millimetres each), time in solution (30 minutes), source of samples (from the same potato), and personal accuracy. Prediction: Some samples will weigh heavier since water enters the cell by osmosis; while some will weigh lighter since water leaves the cell by osmosis. ...read more.

Conclusion

Therefore, the potato has a concentration of 7.1%. Conclusion: One sample weighs lighter, which suggests the potato slides lose water by osmosis and the potato has a higher water potential (lower concentration) than the 10% sucrose solution. The rest of the samples all weigh heavier than before, which suggests that the slides absorbs water by osmosis and thus the potato has a lower water potential (higher concentration) than the 5% sucrose solution. Comment: According to the graph, we can see that as the concentration of the surrounding solution becomes lower, the change in weight increases. Placed in pure water, a plant cell becomes turgid because of the pressure generated by the cell wall which prevents more water from entering the cell. YIN WENYI 15/10/2002 ...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

    An Experiment to determine Water Potential in Potato Tissue.

    4 star(s)

    any chemical present in any of the two solutions then all my boiling tubes would contain them. I also used the same size of cork borer, this because a different cork would increase or decrease the surface area of the potato thus a faster or slower rate of osmosis.

  2. Investigate the water potential of potato tissue and compare this with the water potential ...

    As it is soluble, it affects the osmotic balance of the cell by lowering the water potential. A potato, unlike an apple, is not a fruit - it is a tuba and its primary job is to produce runners so the plant can expand and produce more plants.

  1. Investigating the cellular water potential of potato cells.

    I will need to make up my own sucrose solutions with different concentrations. In order to do this I will need to look at a table that will show me how to create the solutions properly. Table to show dilutions for different sucrose solutions.

  2. The endeavour of this investigation is to ascertain if there is any effect of ...

    The trends were as expected from the background knowledge and were similar to the secondary source tables results in the Appendix Advantages: - The main advantage was that the experiment showed a very brief result of what is expected when varying the sucrose concentration - The experiment proved to a

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