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IB Biology HL IA examples

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All Biology HL IA Examples

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What is the effect of the concentration (0%, 20%, 40%, 60%, 80%, 100%) of tea tree (Melaleuca alternifolia) oil on the growth of bacteria (non-pathogenic DH5- Alpha Escherichia coli) measured in the diameter of the inhibition zone around the paper disc?
IABiologySL7
New Syllabus
What is the effect of increasing iron (III) chloride concentration (0 mg/L, 2mg/L, 4mg/L, 6mg/L, 8mg/L, 10mg/L) on the growth of duckweed (Lemna minor) in terms of change in number of leaves over 5 days?
IABiologyHL7
New Syllabus
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How do altering salicylic acid concentrations (0.0%, 0.5%, 1.0%, 1.5%, 2.0%) affect the germination of Capsicum annuum longum seeds measuring the radicle length (mm) of the sprouts over 7 days?
IABiologySL6
New Syllabus
How does the presence of earthworms influence the growth of stem in length [cm] of monocots (Avena sativa) and dicots (Phaseolus vulgaris) as measured by the mean height of the stem through 25 days?
IABiologySL6
New Syllabus
What is the effect of the socio-economic development of European countries, as measured by the HDI, on the mortality rate from hypertensive heart disease within the older population (50+)?
IABiologyHL7
New Syllabus
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How does the variety of Capsicum annuum L. (green bell pepper, yellow bell pepper, red bell pepper, red sweet long pepper) and Allium cepa L. (yellow onion, red onion, white onion) influence their vitamin C content in mg/100g, as measured by vegetable juice volume needed to titrate 2 ml of 0.1% DCPIP solution?
IABiologyHL7
New Syllabus
How does the concentration of 50ml of ethanol solution (15%, 30%, 45%, 60%, 75%) influence the cell membrane permeability of beetroot, measured by the absorption transmission of light (Au) using a colorimeter, for 10 minutes?
IABiologySL7
New Syllabus
What is the impact of different temperatures (20 ̊C, 25 ̊C, 30 ̊C, 35 ̊C and 40 ̊C) on the rate of fermentation, measured using a gas pressure sensor in kPa/min, in Saccharomyces cerevisiae (yeast)?
IABiologyHL7
What is the effect of pH (5, 6, 7, 8, and 9) on the rate of activity of amylase, as measured by the time taken for amylase to digest starch?
IABiologyHL6
How do different pHs of distilled water, H2O, (5.98, 6.90, 7.40, 8.30, 8.70)(±0.02) affect the permeability of cell membranes in cells of Beta vulgaris (beetroot) cells, when temperature is constant at 25.00℃ (±0.05), through examining the quantity of pigment leaked into water using a colorimeter (±1.7%)?
IABiologyHL6
To what extent does the concentration of sucrose solution (%) affect carbon dioxide production (ppm) during yeast fermentation under 180 seconds?
IABiologyHL6
How does the percentage of sulfuric acid (%) affect the growth of Vigna radiata for 10 days, measured by percentage change in dry mass (%)?
IABiologySL7
How does temperature(-11.9 °C, 7.7 °C, 14.9 °C, 27.8 °C ) and airflow affect the ripening of the Cavendish, Apple, and Green species of bananas over seven days by measuring the mass (g), brix value (°Bx), and pH of the bananas, while ensuring that days of ripening, acclimatisation period, exposure to air and branch of the banana is standardised and controlled?
IABiologySL5
What is the effect of the ethanol concentration (20%, 40%, 60%, 80%, 100%) on the rate of osmosis in potatoes through the change in mass (g) of a (2.5x0.5x0.5 cm) potato chip submerged in said ethanol concentration for a 24 hour period?
IABiologySL5
What is the effect of different concentrations of eucalyptus oil (0%, 20%, 40%, 60%, 80%, 90% and 100%) on the growth of E.coli bacteria, measured by the largest diameter of the zone of inhibition (in cm)?
IABiologyHL7
What is the effect of varying caffeine concentration (0%, 5%, 10%, 15%, 20%, 25%) on the inhibition of lipase enzyme activity on triglycerides in milk, as measured by a stopwatch to record the time (seconds) for the solution to change color caused by a 1% phenolphthalein indicator at room temperature (25ºC)?
IABiologyHL7
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How do various soy milk concentrations, ranging from 0% to 100%, affect the hydrolysis rate of protein as measured by change in absorbance levels over time (nm*min-1) over 20 minutes, whilst exposed to the enzyme trypsin?
IABiologyHL7
How do different concentrations of ethanol [0%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%] affect the catalase activity in potato Solanum Tuberosum measured by the amount of oxygen gas produced after incubating with ethanol for 1 minute and reacting with hydrogen peroxide for 5 minutes?
IABiologyHL5
How do different temperatures (15.0℃, 20.0℃, 25.0℃, 30.0℃, 35.0℃ ± 0.5℃) affect the lactase enzymatic activity in milk determined by the glucose levels (mmol/L) presented after its incubation period (60 minutes) measured using a blood glucose meter?
IABiologyHL6
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What is the effect of different KCl percentage concentrations (0.0, 0.5, 1.0, 1.5, 2.0, 2.5) on the germination rate of Triticum Aestivum.
IABiologyHL7
How do varying concentrations (0.0,0.1,0.2,0.3,0.4,0.5mol/dm3) of sucrose (C12H22O11) affect the cell respiration rate in yeast (Saccharomyces cerevisiae) by measuring the volume of carbon dioxide (CO2) gas released after yeast activation using a gas syringe over a period of 10 minutes?
IABiologyHL6
How does changing the concentration of coffee solutions (0.000%-1.000%) affect the hydrolysis of egg albumin by using the stomach enzyme, pepsin, after a period of 20 minutes?
IABiologyHL7
How does the increase in the mean Body Mass Index (BMI) (24.0 – 30.9 kg/m2 ) for countries have an effect on their case-fatality (%) of patients with SARS-CoV-2, measured using the overall deaths and cases of SARS-CoV-2 patients in the countries, using the databases of World Health Organization, and Johns Hopkins Coronavirus Resource Center?
IABiologyHL6
How do varying concentrations of hydrogen peroxide (0%, 1.5%, 3.0%, 4.5%, 6.0%, 7.5%) affect the radicle length (mm) of Vigna radiata during its one-hour imbibition (pre-germinative seed soaking) before seed germination over a time period of 72 hours?
IABiologyHL7
What is the correlation between the Human Development Index (HDI) and the prevalence rate of type 2 diabetes (measured in the number of prevalence by 100 people) in countries worldwide?
IABiologyHL5
How do different concentrations (0%, 20%, 40%, 60%, 80%, 100%) of tea tree (Melaleuca alternifolia) oil affect the growth of bacteria (non-pathogenic DH5-Alpha Escherichia coli) measured in the diameter of the inhibition zone around the paper disc?
IABiologyHL6
How do the emissions in metric tons of a country affect the incidence rate of non-communicable diseases (Lung Cancer and Chronic Obstructive Pulmonary Disease) per 100,000 people in Europe?
IABiologyHL6
How does the rate of Saccharomyces cerevisiae fermentation, measured by volume of CO2 produced (in cm3) over a period of time (5 minutes), change with type of sugar (glucose, fructose, lactose, maltose, sucrose)?
IABiologySL6
How is the daily growth rate of Lemna minor populations influenced by increases in phosphorus concentrations within closed aquatic systems?
IABiologyHL6
What is the effect of increasing Fe (III) concentration (2mg/L, 4mg/L, 6mg/L, 8mg/L, 10mg/L) on the growth of Duckweed (Lemna minor) in terms of change in number of leaves over 5 days?
IABiologyHL7
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How do varying concentrations of Aloe vera gel (10%, 20%, 30%, 40%, 50%) in a pH balanced solution (pH 4) affect the percentage dehydration of Red Delicious apples (Malus domestica) measured by the change in mass (g) after a period of 7 days?
IABiologyHL6
What is the effect of the volume of copper sulphate solution (0 cm3, 2 cm3, 4 cm3, 6 cm3, 8 cm3) added on the rate of hydrogen peroxide decomposition catalysed by catalase as measured by the height of the oxygen bubbles produced (mm) in 15 minutes?
IABiologyHL7
To what extent does the sucrose concentration (g/dm3) affect SCOBY (Symbiotic Culture Of Bacteria and Yeast) fermentation rate (measured by the pH change/days) of Kombucha tea?
IABiologyHL7
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How will differences in soluble fiber concentrations, ranging from 0% to 2%, affect the rate of hydrolysis of starch in 10 minutes, using a pancreatic amylase enzyme?
IABiologyHL7
What is the effect of the Aspergillus species present (A. luchuensis and A. luchuensis mut. kawachii) and the concertation of koji used (0.0%, 10.0%, 20.0%, 30.0%, 40.0%) on the process of amazake fermentation measured by the change in pH over the period 6 hours at a temperature of 60.0°C?
IABiologyHL7
How do altering salicylic acid concentrations (0.0%, 0.5%, 1.0%, 1.5%, 2.0%) affect the germination of Capsicum annuum longum seeds measuring the radicle length (mm) of the sprouts of over 7 days?
IABiologyHL7
What is the effect of initial pH (4.0, 4.5, 5.0, 5.5 and 6.0) on the rate of Saccharomyces pastorianus yeast fermentation, measured by the amount of Glucose used in the process?
IABiologyHL5
How does the concentration of sodium chloride ions (0.0, 0.3, 0.6, 0.9, 1.2, 1.5, 1.8 )% affect the rate at which -amylase hydrolyses starch, measured as the rate of change of absorbance values/ Au s-1(±0.001) of starch in iodine solution using a spectrophotometer, (light wavelength set at 430nm) in 300s?
IABiologyHL5
What is the correlation between Human Development Index and case-fatality rate due to breast cancer per 100,000 people in 2020 among very high and highly developed European countries in female populations aged 45 or more?
IABiologyHL6
What is the correlation between the human development index (HDI) of 30 countries in Europe and the incidence and mortality rates of lung cancer (measured as incidence and mortality rate per 100,000)?
IABiologyHL5
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