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How does Sulphur Dioxide effect the Germination of Cress Seeds?

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How does Sulphur Dioxide effect the Germination of Cress Seeds Planning: Aim: The aim of this coursework is to find out how varied amount of sulphur dioxide effect the germination of cress seeds. Safety: This experiment could be very dangerous because there are some chemicals, which are harmful for human body will be involved in this experiment. Such as sodium metabisulphite, it would damage your lungs and eyes when it mixed with gases. So, I will do the following things to prevent any accidents during the experiment. 1, I will be following the instruction when I am doing the experiment, and listened what teacher said as the experiment is processing. 2, I will wear eyes goggles to prevent the harmful gases contact with my eyes. 3, I will wear plastic gloves on all the times to prevent the chemical liquid contact with my skin. And if there is any chemicals contact with my skin or eyes, clean it with water immediately, and report to the teacher for helping as soon as possible. ...read more.


Those were the reasons for my prediction. Method: For the first experiment, I need the following apparatus - some pots, a sealed bag, an indicator, cress seeds, some cotton wools and sodium metabisulphite. Then, I will put some sodium metabisulphite into my first pot and let it cover the bottom, and I will put about 10 drops of water in and seals the bag. Secondly, I will put 6 drops of indicator into it and seals the bag, and wait for about 5 minutes. Thirdly, I will put some moist cotton wools and place 20 seeds all over the pot randomly, then put the pot in a moisture place and leave it for few days. After few days, the indicator's colour changed to red from blue, which means the sodium metabisulphite reacted with air and affected the indicator. And all the cress seeds have all germinated. For the next part of my experiment, I am doing to investigate how does sodium metabisulphite and water (Solution A) ...read more.


I have chosen 6 different concentration of solution A to do this experiment, which are 30:0, 28:2, 26:4, 24:6, 22:8, 20:10 with 30cm3 water. For this par, I need pots, 6 sealed bags, cotton wools, cress seeds and some solution A. Firstly, I will fill the first pot with water and second pot with sodium metabisulphite. Secondly, I put cotton wools in to next 6 pos and let them cover the bottom, and I put 20 seeds into each pot. Thirdly, I measure 30cm3 water and pour it into the first pot, and I will place it into the bag. Then, I just repeat the last step to the other pots with different concentration of solution A. and leave it foe another few days. After few days, I have got the results. The table below shows the results. Water (cm3 ) Sodium Metabisulphite (cm3 ) No. of seeds Germinated Percentage of Water (%) 30 0 20 100 28 2 20 93 26 4 12 86 24 6 5 80 22 8 0 73 20 10 0 66 Obtaining and Analysing: The graph below shows that the number of seeds germinated against the amount of water involved. ...read more.

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