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

An Investigation into the water relations of plant tissue.

Extracts from this document...

Introduction

Christ the King School: Centre 34675 An Investigation into the water relations of plant tissue Name: Josh Bladen 11D Introduction: For my year 10 Biology coursework, I was asked to investigate Osmosis, and it's effect on foodstuffs, namely potatoes. Osmosis is the movement of water molecules from an area of high concentration in a dilute solution to an area of low concentration in a concentrated solution, through a partially permeable membrane such as a cell membrane. The problem I have been asked to investigate is a farmer's crop of standard white potatoes, on low level land near to the coast. I have been asked to show how much sea water flooding the crop can take before irreparable damage is done to the crop and it becomes unsellable. This damage would be caused by osmosis, as I have outlined above. Because the sea water is salty, it has less water in it than the water inside the potato cells, causing the water in the potatoes to drain out to the surrounding sea water. ...read more.

Middle

Controlled variables: In order to make this experiment a fair test, we must change only one thing and keep everything else the same. Sucrose Solution Concentration We must change this as it is the basis for our experiment. We will change it in 25% increments, but as we have 30 chips and are putting 3 in each tube, we must use ten tubes. So, the second rack will have increments of 25%, but will start at 12.5%, so as to show the differences between rack one values. Size of potato chips This must be kept the same in order to obtain accurate result. If the chips are oddly sized then the osmosis may act on the smaller, thinner chips with less water faster and thus spoil our results. Amount of solution in each tube Must be kept the same or else there will be tubes that had more solution will weigh less and the tubes with less in may not even cover the chips, causing them to weigh more. ...read more.

Conclusion

12.98 10.98 C 37.5% 13.02 11.02 A 50% 13.00 10.65 B 50% 13.01 10.40 C 50% 13.02 10.36 A 62.5% 13.00 10.01 B 62.5% 12.99 09.97 C 62.5% 13.00 11.00 A 75% 13.00 08.79 B 75% 13.00 08.55 C 75% 12.98 08.88 A 87.5% 13.00 07.03 B 87.5% 13.03 06.97 C 87.5% 13.02 06.94 A 100% 13.00 04.98 B 100% 13.03 04.99 C 100% 13.03 05.02 Graphs: Conclusion: Discuss your prediction, and osmosis. Talk about every part of the graph and what's happened. What about results that don't fit - including those in your table, not just the graph. Relate back to the original question about plants and sea water. It might seem like you're repeating some of the introduction - that's ok. A quarter of the marks are for the conclusion - don't skimp. If you need to add drawings to illustrate your conclusion, click a few returns to make space and draw them by hand on your print out. Evaluation: Josh Bladen 11D Page 1 of 4 ...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. Factors Affecting Osmosis In Plant Tissue

    at eye level so that the concave of the liquid is what the amount is measured at. This is known as the 'meniscus'. As stated in the plan, there are many factors that can affect the rate of osmosis, which must be kept constant so that the experiment is a fair and accurate test.

  2. An experiment to investigate osmosis in plant tissue.

    Scalpel viii. Tile ix. Tissue paper x. Electronic balance xi. mm ruler xii. Forceps xiii. Test tube rack xiv. Small sieve xv. Clock Method: Preparing solutions for osmosis experiment These values were used as they cover a large range and have been used in a previous experiment and were successful.

  1. Osmosis is defined as 'the movement of water molecules from an area of high ...

    were left in water baths for the same amount of time * It was made sure that the scales were reading "0" before the potatoes were placed on them to take the weight * The potatoes were dried after the experiment so the mass of residue water on the potato

  2. An Investigation to Determine the Water Potential of a Plant Tissue.

    A previous AS experiment suggests that the concentration of sucrose at this point should lie between 0.2M and 0.4M. Preliminary work What will be the dependent variable? I.e. what is going to be measured? There are many possibilities including mass, length, and volume.

  1. Investigation on the effect of osmosis in plant tissue.

    8) Each concentration is performed three times to find an average and obtain reliable results. Make sure the set of three tests for 'A', 'B', 'C', 'D', 'E' and 'F' are performed together to save time. SAFETY: Some safety measures must be adhered to during this experiment.

  2. Osmosis In Plant Tissue.

    Plants wilt without enough water to develop turgor pressure. Plant cells have a cellulose cell wall around them. In an isotonic solution, the cell will remain the same size in an hypertonic solution; the plasma membrane of the cell will pull away from the cell wall as the cell shrinks. This situation is called plasmolysis. Preliminary Practical. Apparatus List.

  1. Investigating the Factors affecting the water relations of plant cells.

    A plant cell in a dilute solution 1 Cell wall 2 Cell membrane 3 Nucleus 4 Vacuole 5 Osmosis takes place into the cell: water passes through the cell wall, diffuses through the partially permeable cell membrane and the cytoplasm and enters the vacuole. The cell swells and becomes turgid.

  2. Investigating The Effect Of Osmosis On Plant Cells And Tissue

    It will be unsuitable for me to wipe a wet cloth on a top-pan balance, but a petri dish can be easily washed and wiped clean after weighing each potatoes core. The potato cores fully covered in the sucrose solution is also another vital part in order to make this experiment as fair as possible.

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