21.4.20 A Practical Demonstration

Today we are taking a closer look at microbiology, having had a brief introduction before the Easter holidays. We needed a known source of micro organisms with which to conduct our investigation and the yeast in the levain we started back then was more than suitable. If the average bacteria were to be scaled up to the size of a man, then a single cell of yeast would be about the size of an elephant in comparison - we should be easily able to observe results. The question the children are investigating is what are the factors that affect micro organisms' growth and behaviour. As you can see, some of the variables we will be looking at are nutrients, temperature, acidity, protest and public demonstration.