The Effect On Respiration of Yeast At Different Temperatures.

Authors Avatar

Davie Webb         Biology Coursework1        11RMC

Glucose + oxygen = carbon dioxide + water

In this investigation I’m going to investigate the effect on respiration of yeast at different temperatures.

For a fair test-

  • Only change the temperature of the water in the experiment.
  • Use same amount of yeast each time.
  • Use the same size tubing.
  • Keep the Amount of time between taking results the same.
  • Use same amount of yeast.

I am going to find out the speed at which yeast respires at a range of temperatures and at what temperature it respires best.

  As shown in the diagram, I am going to fill a test tube up near the top with yeast. I filled it almost near the top because there will be less air to compress and my results will be more reliable because there will be twice as many bubbles produced than a half full tube.

The bung to the test tube has a tube linked onto it, which I placed into a beaker of tap water. There was a range of tube sized to choose from but I used the smallest possible tube, again to get the most reliable results as possible because there will be more bubbles and they will be nearer the same size.

Join now!

I placed the yeast filled test tube into a water bath. These baths were spread across the classroom and were at different temperatures. I left the tube in the bath so I would be sure that the temperature would stay the same and not go back to room temperature. Before I started my experiment when I placed the tube into the water bath I left it for 1 minute before I took any readings. I did this because in the first minute of when it gets into the hotter water, the air is expanding so the bubbled produced may ...

This is a preview of the whole essay