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To measure the rate, you can either measure how quickly different species grow, or one of the other factors described below. This can become interesting because you can test how different conditions affect milk’s spoilageĮxperimental setup: In this experiment, you can compare milk spoilage. Milk goes off because of lactobacilli reproduction and growth. Independent Variables: Different toothpaste manufacturers (Colgate vs Sensodyne vs Crest vs Aquafresh)ĭependent Variable:Â Success of bacterial growth (seen by growth on an agar plate) Then use agar plates and bacteria to test their effectiveness by seeing how many bacteria grow in the different plates! Heres a link to a scientific article that did something very similar, copy their method. How do different kinds of toothpaste compare?Įxperimental setup: Choose different types of toothpaste/mouth-rinse and create diluted solutions of them (mix them with water). Toothpaste is supposed to block bacterial growth. Testing Effectiveness of Types of Toothpaste/Mouthrinse If you’re interested in getting additional support for your Biology IA, we have a team of expert IB Biology tutors that can help you plan, structure and execute your assignment.
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Remember! It’s very important that you consider if whether you can apply these topics to your own life, as this shows personal engagement.ĭownload our Guide: How to Write a Perfect Biology IA (Click Here) Within each topic listed below, we include the basic reasons for investigating each topic, what the possible independent variables and dependent variables are as well as the basic experimental setup! In this post, we give you 50 IB Biology IA Ideas to help you speed up your research process. Stuck for Ideas planning your Biology IA?