Science 9 – Today the students used some active yeast to observe asexual reproduction. The lab itself is quite straight forward and the students get a chance to practice laboratory skills: zeroing a scale and measuring mass, using a graduated cylinder, making a wet mount slide and using a microscope.
There are several hurdles for a large class. First, there is little room and not enough equipment to keep all students involved and practicing the skills mentioned above. Secondly, the budding is hard to identify at first. A person needs to spend a while looking through the microscope before they will recognize the subtle differences in shape of the yeast as it is budding. Lastly, students need considerable assistance in focusing on their slides. To do properly, I feel that this lab requires one hour. Some groups would finish it a lot sooner though.