Experiment-Based IB Bio IA Topics

Experiment Based IB Bio IA Topics

Hello, aspiring scientists and biology enthusiasts! Are you eager to dive into the hands-on world of experimental research for your IB Biology IA? Look no further! I’ve curated a list of experiment-based IB Biology IA topics that will allow you to explore the wonders of life through practical investigation.

If you’re fascinated by the inner workings of cells, the intricacies of plant physiology, or the behavior of organisms, there’s a topic here that’s sure to capture your imagination and ignite your scientific curiosity.

So, grab your lab coat, and let’s set off on an exciting adventure of discovery, where every experiment brings you closer to unlocking the secrets of the natural world.

List of Biology IA Topics and Experiments

I’ll provide you with various topics together with potential experiments to cover your research.

1. Enzyme Activity

  1. How does temperature affect the rate of enzyme activity in catalase?
    • Experiment: Measure the rate of oxygen production by catalase at different temperatures.
  2. What is the effect of varying pH levels on the activity of amylase in breaking down starch?
    • Experiment: Monitor the rate of starch hydrolysis by amylase at different pH values.
  3. How does the concentration of substrate (e.g., hydrogen peroxide) influence enzyme activity?
    • Experiment: Investigate the effect of different substrate concentrations on enzyme kinetics.

2. Photosynthesis

  1. How does light intensity impact the rate of photosynthesis in aquatic plants?
    • Experiment: Measure the production of oxygen bubbles at varying light intensities.
  2. What is the relationship between the color of light (wavelength) and photosynthetic pigments’ absorption rates?
    • Experiment: Use spectrophotometry to determine pigment absorption across the light spectrum.
  3. How do different carbon dioxide concentrations affect photosynthetic rates in plants?
    • Experiment: Measure the rate of CO2 uptake by plants at varying CO2 concentrations.

3. Cellular Respiration

  1. What is the effect of different sugar concentrations (glucose) on yeast fermentation?
    • Experiment: Monitor the rate of CO2 production by yeast at varying sugar concentrations.
  2. How does temperature influence the rate of cellular respiration in germinating seeds?
    • Experiment: Measure the rate of O2 consumption by germinating seeds at different temperatures.
  3. What is the impact of substrate availability (e.g., ethanol) on the rate of anaerobic respiration in yeast?
    • Experiment: Investigate the production of ethanol by yeast at varying substrate concentrations.

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4. Genetics and Inheritance

  1. How does the genotype of parents influence the phenotypic ratios in offspring for a specific genetic trait?
    • Experiment: Perform a monohybrid or dihybrid genetic cross and analyze offspring phenotypes.
  2. What is the relationship between DNA sequence mutations and the resulting phenotypic traits?
    • Experiment: Use PCR to amplify and analyze specific DNA sequences with known mutations.
  3. How does exposure to mutagenic agents (e.g., UV light) affect the mutation rate in bacteria?
    • Experiment: Measure the mutation frequency in bacteria exposed to different levels of UV light.

5. Ecology and Ecosystems

  1. How does the presence of different species impact biodiversity in a specific ecosystem?
    • Experiment: Conduct a biodiversity survey in different ecological zones and analyze species richness.
  2. What is the effect of pollution (e.g., oil spills) on aquatic ecosystem health and biodiversity?
    • Experiment: Simulate an oil spill in a controlled aquatic environment and monitor its impact.
  3. How do different types of soil affect plant growth and nutrient uptake?
    • Experiment: Grow the same plant species in different soil types and measure growth parameters.

6. Evolutionary Biology

  1. How does natural selection influence the frequency of specific traits in a population over generations?
    • Experiment: Use a computer simulation or model organisms to observe the effects of selection.
  2. What is the role of genetic drift in shaping allele frequencies in small populations?
    • Experiment: Create and study small populations to observe genetic drift’s impact.
  3. How does geographic isolation lead to speciation in island populations?
    • Experiment: Analyze genetic and phenotypic differences between mainland and island populations.

7. Human Physiology

  1. What is the relationship between heart rate and physical activity levels in humans?
    • Experiment: Measure heart rate at rest and during different types of physical activities.
  2. How do various factors (e.g., caffeine, stress) affect blood pressure in humans?
    • Experiment: Monitor blood pressure changes in response to different stimuli.
  3. How does the type and concentration of a substrate influence the rate of salivary amylase activity in humans?
    • Experiment: Analyze the rate of starch digestion by salivary amylase at different substrate concentrations.

8. Microbiology

  1. How does the concentration of an antimicrobial agent (e.g., disinfectant) affect the growth of bacteria?
    • Experiment: Test the effectiveness of different concentrations of a disinfectant on bacterial growth.
  2. What is the impact of antibiotic resistance on bacterial growth in the presence of antibiotics?
    • Experiment: Assess bacterial growth with and without antibiotics to examine resistance.
  3. How does temperature affect the growth rate of a specific bacterial species?
    • Experiment: Cultivate bacteria at different temperatures and measure growth rates.

9. Plant Biology

  1. How do different types of soil (e.g., loam, sand) affect plant root growth and development?
    • Experiment: Observe root growth and branching patterns in plants grown in various soils.
  2. What is the impact of plant hormone treatments (e.g., auxins) on stem elongation and growth?
    • Experiment: Apply different plant hormones to assess their effects on stem growth.
  3. How does the intensity and duration of light exposure affect plant germination rates and seedling growth?
    • Experiment: Vary light conditions to observe their impact on seed germination and growth.

10. Animal Behavior

  1. What is the effect of environmental stimuli (e.g., temperature) on the circadian rhythms of animals?
    • Experiment: Monitor the activity patterns of animals exposed to different environmental conditions.
  2. How do different types of stimuli (e.g., visual, auditory) influence animal learning and behavior?
    • Experiment: Train animals to respond to specific stimuli and analyze their learning curves.
  3. How does the presence of a predator or prey affect the foraging behavior of a specific animal species?
    • Experiment: Observe and record foraging behavior in the presence and absence of predators or prey.


And there you have it – a collection of experiment-based IB Biology IA topics that are sure to inspire your investigative spirit and fuel your passion for biology. Whether you’re interested in exploring enzyme kinetics, dissecting the factors that affect photosynthesis, or investigating animal behavior, this list offers a diverse array of topics to suit your interests and challenge your experimental skills.

Always keep in mind, the key to a successful IA is choosing a topic that not only excites you but also allows you to demonstrate your ability to design, conduct, and analyze a scientific experiment. So, pick a topic that resonates with you, and set off on a journey of exploration that’s not only academically rewarding but also personally enriching.

Happy experimenting, and may your Biology IA be a testament to your dedication and creativity in the pursuit of scientific knowledge!

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