AQA GCSE Combined Science 8464 / Biology 8461
126.96.36.199 Bacterial Diseases (optional practical)
"Starter: Show students an agar plate that has been exposed to the air and incubated and one that has not, place under the visualiser. What can they see? Think, pair, share. What does each colony represent? Suggest how we obtain a pure culture of one micro-organism.
Introduce the term aeseptic, and how to perform an aeseptic technique
Main: Students to carry out aeseptic technique practical - streak plate.
Plenary: Students to create flash cards summarising the step by step process of an aeseptic technique to create a streak plate.
"Starter: How fast do bacteria multiply? Think, pair, share
Main: Using the laminated grids, count the number of colonies of bacteria on the agar jelly. They can count individually or use percentage cover.
Students to come up with a list of what factors affect the growth of a bacteria population (temperature, avaliable nutrients, oxygen levels and pH).
Calculate the number of bacteria in a population (based on bateria dividing ever 20 minutes or every 30 minutes, the time the agar jellies have been incubated for should be with the practical apparatus).
Plenary: PEQ, green pen peer assess."