Independent Variable: Different Antibiotics, Different Seedsĭependent Variable: Success of Germination, Rate of Germination But how do antibiotics affect the growth or successful germination of plants?Įxperimental Setup: Grow germinating seed in environments with different types of diluted antibiotics, see how many succeed in each environment. Independent Variable: Age, Tiredness, Gender, Eye ColourĬhallenge: Gathering enough data, Pollution affecting species growth,Īntibiotics are used to treat plants for bacteria.
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Use online colour vision tests to see how different factors affect colour blindnessĮxperimental setup: Follow this link to find out more about colour blindness and how to investigate it. Independent Variables: How temperature affects transmission viral diseases, How different methods of transmission affect rates of spreadingĬhallenge: Statistical analysis Website with loads of data on infectious disease: Use the epidemiological data to measure rates of changeĮxperimental setup: Follow this link to for more information of modelling! Independent variables: Age of participant/Age + sensory stimuli (how to hearing, seeing and touch-based reaction rates change)ĭependent Variables: Time taken to catch ruler between fingers /Time taken to clap when they see lightĬhallenges: getting enough people to get reliability, controlling variablesĭifferent diseases spread at different rates in different weather conditions depending on how they are passed between organisms (Skin contact, Blood-Blood contact, Cross-species barriers). Many say that as we get older, our reaction times slow down, see if this is true!Įxperimental setup: Gather participants for the study and compare how quickly they can catch a ruler (measured in cm). Independent Variables: Temperature, Sunlight variation, Skimmed vs Whole,ĭependent Variable: Rate of bacterial growth (on agar plates), pH of milk
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A full experimental setup can be found on this link 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. 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?
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