Biology Exemplars

About Biology Coursework Exemplars

The Coursework Exemplars section gives IB students (both SL and HL) access to real, high-quality samples of IB Biology Internal Assessments (IA) and Extended Essays (EE). Each exemplar is carefully selected to model top-scoring work, aligned with IB assessment rubrics and showcasing what examiners expect at different achievement levels.

On this page, you'll find full-length exemplars annotated with examiner commentary, highlighting strengths, weaknesses, and specific rubric-based insights. These samples demonstrate how ideas are structured, arguments developed, and criteria met to achieve high marks.

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IB Biology Exemplars

About Biology Coursework Exemplars

How does modifying the concentrations (0%, 20%, 40%, 60%, 80%, 100%) of Melaleuca alternifolia leaf oil (Tea Tree oil) affect the growth of Escherichia coli (E. coli) by measuring the zone of inhibition of E.coli?

How do the varying concentrations of Vitamin B Complex supplementation (0.01M, 0.05M, 0.10M, 0.20M and 0.30M) affect the aerobic respiration of yeast (Saccharomyces cerevisiae), measured by the concentration of carbon dioxide gas produced using Carbon Dioxide Sensor after 10 minutes?

What effect does varying the concentration (0.1, 0.2, 0.3, 0.4, 0.5 mMol) of galactose as a competitive inhibitor have on the rate of lactose hydrolysis by lactase, measured by the amount of glucose produced (in mg/dL) using a glucometer after 90 minutes of heating in a 37℃ water bath?

How does the annual HIV incidence rate correlate with the mortality rate from non-Hodgkin lymphoma in Indonesia from 1990 to 2020?

How does the concentration of immobilised lactase pills in sodium alginate beads affect the hydrolysis of lactase as measured by the concentration of glucose produced?

Investigating the Effects of Different Amounts of Potassium Chloride (KCl) on the Growth of Basil (Ocimum bascilicum) Seedlings

What is the correlation between tree canopy cover (min 6.34% - max 35.82%) and the relative percentage cover of Vaccinium vitis-idaea to Vaccinium myrtillus (min 0.034 - max 1.097) in mixed pine forests on sites with more than 50% joint cover on Vässarö, Sweden?

How does the different colors of Capsicum annuum (yellow bell pepper, green bell pepper, red bell pepper, and orange bell pepper) affect the vitamin C content measured by determining the volume of freshly squeezed juices of these vegetables needed for complete titration of 2ml 1% DCPIP solution?

To what extent can different concentrations (0.5%, 1%, 2%, 3%) of potassium sulfate (K2SO4) reduce the damage (reduced radicle length) caused by 0.5% concentrated NaCl salt stress on chickpea radicle length over 3 days?

How does the concentration of potassium chloride (KCl) solution (0 mol/m3, 0.2 mol/m3, 0.4 mol/m3, 0.6 mol/m3, 0.8 mol/m3, 1 mol/m3) affect the growth of Solanum lycoperscium, measured by stem length increase (cm)?

How do different types of sweeteners (such as natural sweeteners, artificial sweeteners, sugar alcohols, novel sweeteners and corn syrup) affect the rate of respiration in fermented Saccharomyces cerevisiae by using a carbon dioxide sensor?

Investigating the effect of temperature change on the lactase-catalyzed lactose hydrolysis

Research Question: How do varying concentrations of sodium phosphate (0.0M, 0.2M, 0.4M, 0.6M, 0.8M, 1.0M) affect the growth rate (mm/day) of Trigonella foenum-graecum (Fenugreek) over 13 days?

How does the concentration of Allium Sativum oil affect maltose and glucose production from amylase?

What effect do different concentrations of ethanol solution (15%, 30%, 45%, 60% and 75%) have on the cell membrane permeability of beetroot (Beta vulgaris L.), measured by the absorption of light (at wavelengths 470 nm and 626 nm)?

The research question that this experiment aims to answer is: How does the river current velocity ms-1 (0.9877, 0.5157, 0.2147) affect the frequency of Mayfly Nymphs (order Ephemeroptera) in a Freshwater stream in the Nettlecombe River?

To what extent do genetics or environmental factors have a larger role in determining gene expression respectively, as researched in monozygotic twin model studies and observations in DNA methylation changes?

How does varying soil acidity affect the growth rate of the plant height of Raphanus sativus in a mesocosm environment?

How do different concentrations (0.0, 0.1, 0.5 and 50 mM) of glucose affect the germination rate of wheat seeds (Triticum aestivum) under salinity stress (200 mM NaCl) over 5 days?

How does susceptibility to metabolic syndrome (measured by physical body parameters, blood profile & lifestyle factors) correlate with muscle strength measured by handgrip dynamometry in females aged 35-50?

Is there a relationship between the abundance of sea lettuce (Ulva lactuca) (categorized by SACFOR) and the density of common limpets (Patella vulgata) in a marine environment at Helwell Bay?

How do the different concentrations of 0.2 M ethanol (0% , 2%, 4%, 6%, 8%, 10%) affect photosynthesis in Elodea canadensis, measured by pH changes in the solution before and after a 40 hour-period?

EFFECT OF DIFFERENT POTASSIUM CHLORIDE CONCENTRATIONS ON RADISH SEEDS

To what extent does urbanization impact the avian diversity and native population in the United States Midwestern ecosystems?

To what extent do metal ions (silver, copper, barium, and zinc) affect the inhibition of Lactobacillus acidophilus growth at different concentrations (1 M, 0.1 M, 0.01M, 0.001 M) in 24 hours as measured by the zone of inhibition?

How do different concentrations of Carbon Dioxide affect the change in height (biomass indicator), hence the photosynthesis rate of allium schoenoprasum ?

How does the presence of invasive Tatarian honeysuckle (Lonicera tatarica) in dry-mesic southern forests impact plant species richness as represented by the number of distinctive plant species visible within a 1-meter2 area quadrat?

To what extent does meat consumption (kg per capita per year) of different types of meat (Beef, Pork, Poultry, Fish and Seafood) influence the prevalence of cardiovascular diseases in a globally representative sample of 50 countries

To what extent does Body Condition Score (1-9) and body mass (kg) impact resting and active heart rate (beats per minute) in purebred canines (Canis lupus familiaris)?

A study into the possible relationship of blood pressure and the onset of Alzheimer’s disease in individuals aged fifty years and above.

¿De qué manera la prevalencia de las enfermedades cardiovasculares se relaciona con la tasa de mortalidad por neumonía en individuos mayores de 50 años entre los años 1990 y 2005 en España, Turquía, Egipto, Estados Unidos y Corea del Sur?

How do Zinc Sulfate, Aluminium Sulfate, Lead Nitrate and Lithium Chloride affect the activity of phosphatase enzymes in mung bean sprouts (Vigna radiata)?

The antimicrobial effects of 1M metal salts, Cu(NO3)2 Fe(NO3)3 Zn(NO3)2 Ni(NO3)2 and Pb(NO3)2 on the growth of bacteria.

To what extent does the duration of vaping (in months) affect the forced vital capacity (l) to height (cm) ratio in the population in Hanoi born in 1999-2008?

How does varying salinity a1ect the hatching rate, growth, and swimming speed of Artemia over a three-day period?

To what extent do varying concentrations of Kalanchoe (Bryophyllum pinnatum) extract inhibits the proliferation of K-12 Escherichia coli and Staphylococcus aureus in LB Agar Petri dishes?

Investigating the Effect of The Rhizophagus intraradices Fungus on Nutrient Uptake and Growth in Mentha spicata Plants under Different Phosphorus Conditions