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# To investigate the factors which affect the respiration of yeast.

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Introduction

GCSE Biology Coursework To investigate the factors which affect the respiration of yeast. The different factors that effect the respiration of yeast are: * Yeast concentration * Volume of yeast solution * Amount of sugar solution * Sugar concentration * Temperature of yeast and sugar solution Having looked at the different factors that will effect the respiration of yeast (shown above), I have chosen to investigate how a change in temperature effects the respiration of yeast; I am going to see how many bubbles come off the solution in a certain amount of time and I am going to repeat the experiment five times with the experiment in different temperatures every time, I am going to go up 20 degrees centigrade every time starting at naught and going to eighty. Having picked to investigate how a change in temperature effects the respiration of yeast I am going to have to use the same amount of the following solutions so that I can have the best possible experiment and results that I could have these are going to be: * 10ml of yeast solution * 10ml of sugar solution * 10-sugar concentration * 10mml of limewater I am going to use the following equipment to conduct ...read more.

Middle

I have decided to do this investigation every 20 degrees, the range of the temperatures I am going to use are: * 0 degrees * 20 degrees * 40 degrees * 60 degrees * 80 degrees Method 1. At first I am going to collect all of my equipment and set it up how I need it for this experiment. 2. I am then going to put on as pair of goggles and collect together all of the solutions I need for the experiment. 3. I will then measure out equal amounts of the yeast solution and sugar solution and out them into a test tube. 4. After that I shall measure out and put an equal amount of limewater into a test tube. 5. I shall then put a bung into the top of each of the test tubes and join them together using a glass delivery tube. 6. I will then put my experiment into a water bath at a certain temperature and give it five minutes to equilibrate. 7. I Am then going to count how many carbon dioxide bubbles got let off in a minute, I will repeat this for five minutes to get the best results I can 8. ...read more.

Conclusion

I think that I could of improved my experiment by using scientific equipment such as a beehive shelf and a measuring cylinder instead of just counting how many carbon dioxide bubbles that were getting let off by the solution. I also think that I could of made my experiment better if I had more time as I could of investigated more of the factors that might have an effect such as the sugar concentration. I found that my results fit the pattern well except that I found a few anomalous results (shown in blue on the table). I don't think that these anomalous results worked right as I don't think that I gave the solution long enough to equilibrate so if I was to do the experiment again then I know I would have tro give the solution longer to equilibrate. The ways in which I could improve my investigation would have to be that I gave my solution 10 minutes to equilibrate instead of 5 minutes, and I could also improve my investigation by using digital equipment, and apparatus instead of counting bubbles, I could of also used downwards displacement of the water method. Dean Broughton GCSE biology coursework ...read more.

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