Best Biology IA Ideas for IB Students in 2024

RevisionDojo
4 min read

Choosing the right topic for your Internal Assessment (IA) can be challenging, but it's crucial for success in the IB program because it can make or break your grade (yes, even 20-30% can push you from a 6 to a 7). This list of ideas is designed to be a springboard to inspire your own unique IA topics that cuts to the chase.

Each idea includes a brief description, difficulty rating, and relevant topics/approaches to consider, making it easier for you to select and refine your IA project. Use these suggestions as a starting point and adapt them to fit your interests and the specific requirements of your subject.

The Effect of pH on Enzyme Activity

  • Difficulty: Easy
  • Topics: Enzymes, pH levels, reaction rates

Photosynthesis Rates under Different Light Intensities

  • Difficulty: Moderate
  • Topics: Photosynthesis, light intensity, chlorophyll

Antibiotic Resistance in Bacteria

  • Difficulty: Hard
  • Topics: Microbiology, antibiotics, resistance mechanisms

The Impact of Soil Types on Plant Growth

  • Difficulty: Easy
  • Topics: Soil composition, plant biology, growth rates

Genetic Variation in Drosophila Populations

  • Difficulty: Moderate
  • Topics: Genetics, fruit flies, allele frequency

Effect of Temperature on Heart Rate of Daphnia

  • Difficulty: Easy
  • Topics: Animal physiology, temperature, heart rate

Comparative Study of Vitamin C Content in Fruits

  • Difficulty: Moderate
  • Topics: Nutrition, vitamin C, titration

Water Quality Assessment Using Bioindicators

  • Difficulty: Moderate
  • Topics: Ecology, water quality, bioindicators

Impact of Acid Rain on Plant Growth

  • Difficulty: Moderate
  • Topics: Environmental science, acid rain, plant biology

Investigating Osmosis in Potato Cells

  • Difficulty: Easy
  • Topics: Cell biology, osmosis, solute concentration

The Role of Light Wavelengths in Algal Growth

  • Difficulty: Moderate
  • Topics: Photosynthesis, algae, light wavelengths

Effect of Caffeine on Human Reaction Time

  • Difficulty: Moderate
  • Topics: Human physiology, caffeine, reaction time

Analysis of Genetic Disorders through Pedigree Charts

  • Difficulty: Hard
  • Topics: Genetics, pedigree analysis, hereditary diseases

Investigating Antibiotic Production in Fungi

  • Difficulty: Hard
  • Topics: Microbiology, fungi, antibiotics

Biodiversity in Different Ecosystems

  • Difficulty: Moderate
  • Topics: Ecology, biodiversity, ecosystem comparison

Impact of Fertilizers on Aquatic Ecosystems

  • Difficulty: Moderate
  • Topics: Environmental science, fertilizers, aquatic ecosystems

Comparative Anatomy of Vertebrate Limbs

  • Difficulty: Moderate
  • Topics: Anatomy, evolution, vertebrates

Effect of Different Sugars on Yeast Fermentation

  • Difficulty: Easy
  • Topics: Microbiology, fermentation, sugars

Study of Plant Tropisms in Response to Stimuli

  • Difficulty: Moderate
  • Topics: Plant biology, tropisms, stimuli

Examining the Spread of Invasive Species

  • Difficulty: Hard
  • Topics: Ecology, invasive species, population dynamics

Effect of Nutrient Deficiency on Plant Health

  • Difficulty: Easy
  • Topics: Plant biology, nutrients, health assessment

Investigating Seed Germination Rates under Different Conditions

  • Difficulty: Easy
  • Topics: Botany, germination, environmental factors

Study of the Carbon Cycle in a Local Ecosystem

  • Difficulty: Moderate
  • Topics: Ecology, carbon cycle, ecosystem analysis

Analyzing the Effect of Pollution on Marine Life

  • Difficulty: Hard
  • Topics: Environmental science, pollution, marine biology

Investigating Blood Type Frequencies in a Populations

  • Difficulty: Moderate
  • Topics: Genetics, blood types, population genetics