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

Biology experiment. Air pollution: Does sulphur dioxide affect seed germination?

Extracts from this document...


Air pollution: Does sulphur dioxide affect seed germination? The aim of this experiment is to find out how sulphur dioxide affects seed germination. This will be done by adding different concentrations of sodium metabisulphite to cress seeds, which will be germinated in a polythene bag for a week. The different solutions will be tested by different users, the concentration you need to use will be assigned. After a week, the results will be notated and plotted on a graph. The graph will indicate the severity of sulphur dioxide during seed germination. Materials required: * filter paper * Petri dish * a pencil * watch glass * tongs * cotton wool * Different concentrations of Sodium metabisulphite * polythene bag * a wire * tap water * 25 Cress seeds Method: 1. ...read more.


8. Tie the bag using the wire. 9. Place it on a windowsill, and leave it to germinate for a week. 10. After a week, record the number of seeds germinated. 11. Plot a graph using the results. Concentration of Sodium metabisulphite (%) Number of seeds germinated Percentage germination (%) Average stem length (Cm) 0 21 84 1.5 0.01 18 72 0.6 0.05 17 68 0.9 0.1 13 52 0.42 0.25 2 8 0.25 1 0 0 0 2 0 0 0 Conclusion: During the experiment each group was assigned a different concentration to test, the one that I recorded was 1%. From my individual experiment I have found that 1% Sodium metabisulphite is enough to stop a plant from germinating. ...read more.


Also the amount of water available to the seeds was near enough equal. To make the results reliable, I have compared my results with people who used the same concentrated solution. The result highlighted on the table, is most likely to be incorrect, incorrectly measured or another factor may have affected its growth. Evaluation: The experiment overall went well. I have found that sulphur dioxide does affect seed germination, when in the right concentration it completely stops the germination. The experiment was made valid and reliable. However to improve it for the future, the experiment can be made more reliable by repeating it several times and taking the average number of germination. To increase the validity I could have ensured that the amount of water was fully equal in each Petri dish. ...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 Green Plants as Organisms 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 Green Plants as Organisms essays

  1. Marked by a teacher

    An investigation into the effect of a germination inhibitor on the germination of seeds.

    3 star(s)

    [Nutrients and other chemicals that could affect the seeds germination are found in soil, and not all of the soil in the pots would have the same amount of these nutrients so therefore some seeds would behave differently to others and it would not be due to the inhibitor concentration.

  2. Factors affecting Germination

    Mix well to create a basic solution 12) Pour solution into a small bowl 13) Add enough vermiculite to adequately soak up the liquid 14) Fill three germination pots with this basic vermiculite leaving 1cm space at the top 15)

  1. Investigation into Cress Seeds

    This is shown by the bell shaped curve, which compared to all the other graphs is the 'flattest'. As the curve is flat, it means that there is not a lot of variation because most of the seedlings are the same height as each other.

  2. Factors That Germination Influence

    * Spacing - Each seed will be placed in a square matrix 2cm away from other seeds. * Temperature - The seeds will all be exposed to room temperature. * Light Intensity - All seeds will be placed in front of the same window.

  1. An Investigation To Show What Different Factors Affect The Growth & Germination Of Cress ...

    By having 4 different sections I am essentially I am repeating the experiment 4 times. Every day I will water the cress seeds using their own solutions. To create the appropriate solutions I did a pre-test using a replicate of my actual experiment and to I watered the 20 cress seeds over a week.

  2. An investigation into the effects of different concentrations of lead chloride on the growth ...

    So for the final experiment, I will therefore be using cotton face pads as this was the most effective medium for growth. Test 2- The method in which to distribute the cress seed, on the most effective medium, to obtain maximum growth.

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