• 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
  13. 13
  14. 14
  15. 15
  16. 16

How Does Osmosis Affect Plant Cells?

Extracts from this document...


Aim: The aim of the experiment is to find out how the concentration of the solution will affect the rate at which osmosis occurs. I will use this as a trial run to find out which concentrations and at what time is best to leave the cuttings for the greatest change in mass to occur. Apparatus: * 2 potatoes * 2 250ml beakers * 25ml of sugar * top pan balance * no. 9 core borer * knife * 375ml of distilled water * tablespoon * stopwatch Method: 1. Collect the equipment. 2. Add 125ml of water and 25ml of sugar in one beaker and 150ml of distilled water in the other. 3. Using the size 7 core borer carefully cut 10 equal 3cm strips out of the potato. 4. Using the scalpel cut the cuttings to 5 grams and 3cm stripes, making them as close to one another as possible. 5. Mix the solution with the tablespoon, then add 5 pieces of potato to each beaker, while timing the length of time they are in for to the set times. 6. At every set time measure the length and mass of all the potato cuttings and put it back into the beaker. 7. Record the results into a coherent table. Fair Test: To make my experiment a fair test I will keep the potato cutting at the same length and mass. I will use the same size borer, no. 7, throughout. My cuttings will be taken from the same type of potato and will contain no peel. The volume of the two liquids must also be kept equal. Table of Results: SUGAR SOLUTION (started at 10:45am) TOTAL MASS (grams) TOTAL LENGTH (cm) TIME TAKEN OUT BEFORE AFTER DIFFERENCE BEFORE AFTER DIFFERENCE 30mins 5 4.82 -0.18 3 3.0 0 1h 30 5 4.37 -0.63 3 2.7 -0.3 4h 45 5 4.02 -0.98 3 2.4 -0.6 24h 30 5 4.15 -0.85 3 2.2 -0.8 28h 45 5 3.96 -1.04 3 2.2 -0.8 WATER SOLUTION (started at 10:45am) ...read more.


Whatever the set time is they must all stay in the same time. Type of plant cell There are different plant cells within a plant. Some plant cells contain more water than others, they all have different concentrations of cell sap therefore the rate of osmosis varies from cell to cell. Use the same potato, one potato and remember to remove the peel, as it contains different cells to the rest of the storage cells that make up a potato. Prediction: I predict that the more dilute the solution (the higher the concentration of water) is, the greater the mass of the potato cutting will be after the set time. The higher the concentration of sugar in the solution is, the more water loss there will be and therefore the lighter the cutting will become. I believe osmosis will occur at a greater rate within the cutting, when there is a greater amount of water than sugar in the solution. This means the cuttings that are put into a higher concentration of water will end up with a larger mass than those put into a higher concentration of sugar. Osmosis is the movement of water from a weaker solution into a stronger solution through a semi-permeable membrane while the other solutions are blocked and unable to pass through the membrane. The water will move from a higher concentration of water to a lower concentration of water through a semi-permeable membrane. For example if there was one side of a semi-permeable membrane with 70% water and another side with 40% water, the side with the greater percentage of water, the 70% side would flow from its higher concentration to the lower concentration to help even out the concentrations to an isotonic point, were both sides will be of equal strength. The water molecules are far smaller than the sugar molecules are therefore they are able to fit through the membrane to the lower concentration. ...read more.


The rate of osmosis would vary from cell to cell and it would be interesting to compare the results and find any links or connections as t o why there are comparisons. Different types of potato (e.g. grown from different areas of the world, under different environments) - I would do a similar investigation as this one only using potato from different environments and climates. Once I find the isotonic solution of the different potatoes I could compare the rate of osmosis within the different cuttings (e.g. I could compare the potato cuttings from a hot climate and from a cold climate and investigate whether there are any connections or patterns with the rate of which osmosis occurs and the environment in which the potato is grown in). Different plants/vegetables (e.g. apple, carrot, etc.) - I could investigate if there is a difference in the rate of osmosis within the different plant/vegetable cells. There would definitely be varying results with the different plants/vegetables, as some are root vegetables (e.g. carrot, potato), some are ground vegetables (e.g. peas) and some are open vegetables (e.g. apples, pears) and each have a different function, for example the function of a root vegetables is to hold all of the nutrients needed to promote the potato seedling to grow without sunlight. Different dimensions and surface areas of a cutting - In the experiment I have just completed I used cuttings of equal dimensions and surface areas, but instead I could very this slightly and vary the dimensions of the cutting which would therefore very the surface area. It would be interesting to see if there was a difference in the rate of osmosis when several cuttings of the same mass, but different dimensions were investigated. My results were fairly accurate and even when they were plotted into a graph I cannot see any obvious anomalies. GCSE Biology Coursework - How Does Osmosis Affect Plant Cells? (Preliminary Work) 5 GCSE Biology Coursework - How Does Osmosis Affect Plant Cells? (Planning) 16 ...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

    How does the concentration of a sucrose solution affect the rate of Osmosis in ...

    5 star(s)

    Point C is where water particles have moved out of the cell, as the concentration of sucrose in the beaker is higher than that in the vacuole, and therefore the mass of the potato cylinder will decrease when water moves out of the vacuole.

  2. Marked by a teacher

    The aim of this investigation is to find out how the concentration of the ...

    4 star(s)

    in more water than a turgid cell with lots of water in because there is less turgor pressure. Osmosis occurs from a region of high water concentration to a region of high concentration, and from a region of low sugar concentration to a region of high sugar concentration.

  1. Marked by a teacher

    Investigating the effect of sucrose concentration on osmosis in potato cells

    4 star(s)

    To look at this more closely, I will look at each concentration: 0.0 M (Distilled Water) Solution 1In all experiments, the potato cells in this solution gained mass, on average 6.87%, highlighted in blue on the table and graph. This happened because water molecules moved across the partially permeable cell membrane by osmosis.

  2. Marked by a teacher

    To investigate how varying the concentration of sucrose solutions affects the rate of osmosis ...

    3 star(s)

    Materials: 1. One large potato 2. Six Petri dishes 3. Twelve labels 4. Six beakers 5. Six droppers 6. One scalpel 7. Distilled water 8. Sucrose solutions of concentrations 0.125M,0.25M, 0.50M, 0.75 M and 1.00M 9. One cork borer of size 2 10. Ruler 11. Graph paper 12.

  1. Efeects of Osmosis in Plant Cells

    Next, each potato cylinder will be measured out to 4cm long with a ruler, and then accurately cut with a scalpel. It is important that each cylinder is exactly the same length otherwise this could affect the surface area, which could affect accuracy of my results.

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

    To make the mass readings more fair, I will take each chip, roll the chip gently on a paper towel, to remove all excess solution, and I must not squeeze the chip. I am also going to use the same balance to weigh my chips.

  1. Factors Affecting Osmosis.

    Thus the water will move from the high water potential in the potato cylinder through a partially permeable membrane to low water potential in the sucrose solution. The potato cylinder therefore decreases in mass because it has lost water. My graph does not support my quantitative prediction because as the

  2. In this experiment I intend to investigate the effects of osmosis on potato cells. ...

    Having done that I will remove each potato sample, weigh it in turn, and then compare my results to discover which of the solutions is closest to the concentration of cell sap. This will be the solution whose potato incurred least weight change.

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