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IB Biology IA SL Examples

Browse top scoring exemplars of IB Biology IA SL with SL/HL samples, examiner-style feedback, criteria breakdowns, and real student Internal Assessment exemplars.

To what extent does the mass of green tea (Camellia sinensis) leaves (1g, 1.5g, 2g,
2.5g, and 3g), affect the rate of amylase-catalyzed starch hydrolysis, measured by
the change in absorbance of starch-iodine complex using a spectrophotometer at
615nm over 10 minutes? - Biology IA exemplar scored 7

To what extent does the mass of green tea (Camellia sinensis) leaves (1g, 1.5g, 2g, 2.5g, and 3g), affect the rate of amylase-catalyzed starch hydrolysis, measured by the change in absorbance of starch-iodine complex using a spectrophotometer at 615nm over 10 minutes?

¿Cómo afecta la exposición durante dos minutos a música rock y electrónica en la frecuencia
cardíaca promedio (bpm) de estudiantes del primer año del Bachillerato Internacional de la
Unidad Educativa JLM “La Salle”, en comparación con su frecuencia cardíaca basal en
reposo? - Biology IA exemplar scored 6

¿Cómo afecta la exposición durante dos minutos a música rock y electrónica en la frecuencia cardíaca promedio (bpm) de estudiantes del primer año del Bachillerato Internacional de la Unidad Educativa JLM “La Salle”, en comparación con su frecuencia cardíaca basal en reposo?

How does increasing the concentration of sodium chloride (NaCl) solutions from 0.0% to 4.0% affect the mass change of Solanum tuberosum tissue after a 24-hour immersion period? - Biology IA exemplar

How does increasing the concentration of sodium chloride (NaCl) solutions from 0.0% to 4.0% affect the mass change of Solanum tuberosum tissue after a 24-hour immersion period?

How does the colour of a lateral light source (blue, green, yellow, orange, red) affect the auxin-mediated, positive phototropic response, indicated by the angle of curvature in Lepidium sativum (garden cress), measured using a protractor after 48 hours of light exposure? - Biology IA exemplar

How does the colour of a lateral light source (blue, green, yellow, orange, red) affect the auxin-mediated, positive phototropic response, indicated by the angle of curvature in Lepidium sativum (garden cress), measured using a protractor after 48 hours of light exposure?

Is there a statistical difference between the direction (North and South) of gravestone faces and the mean percentage cover of the lichen species ‘Aspicilia calcarea’ on gravestones at East Hill Cemetery, Dartford on the 18th of July 2025? - Biology IA exemplar

Is there a statistical difference between the direction (North and South) of gravestone faces and the mean percentage cover of the lichen species ‘Aspicilia calcarea’ on gravestones at East Hill Cemetery, Dartford on the 18th of July 2025?

Is there a significant difference in high school students' reaction time when different stimuli are applied? (Tactile, Visual, and Auditory) - Biology IA exemplar

Is there a significant difference in high school students' reaction time when different stimuli are applied? (Tactile, Visual, and Auditory)

How does the soaking time (0,4,6 hours) and Temperature (25°C and 80°C) of Kombu (Laminaria japonica) affect the amount of iodine remaining in the Kombu before consumption using colorimetric determination with 1.0% starch indicator? - Biology IA exemplar

How does the soaking time (0,4,6 hours) and Temperature (25°C and 80°C) of Kombu (Laminaria japonica) affect the amount of iodine remaining in the Kombu before consumption using colorimetric determination with 1.0% starch indicator?

How does caffeine concentration (0, 0.4, 0.6, 0.8, and 1.0g/cm³) affect the time (seconds) taken for a protease solution (0.8 U/g) to digest proteins in a gelatin sheet (0.5 g), as shown by the viscosity of the protease caffeine mixture solution? - Biology IA exemplar

How does caffeine concentration (0, 0.4, 0.6, 0.8, and 1.0g/cm³) affect the time (seconds) taken for a protease solution (0.8 U/g) to digest proteins in a gelatin sheet (0.5 g), as shown by the viscosity of the protease caffeine mixture solution?

To what extent does temperature (25.0, 30.0, 35.0, 40.0 and 45.0
±0.5°C) affect the rate of catalase activity (cm/s) in Solanum tuberosum tissue, as measured by the volume of foam produced (𝑐𝑚^3) produced when reacted with a 5.0% hydrogen peroxide (H₂O₂) solution over a standardized 60-second enzymatic period? - Biology IA exemplar

To what extent does temperature (25.0, 30.0, 35.0, 40.0 and 45.0 ±0.5°C) affect the rate of catalase activity (cm/s) in Solanum tuberosum tissue, as measured by the volume of foam produced (𝑐𝑚^3) produced when reacted with a 5.0% hydrogen peroxide (H₂O₂) solution over a standardized 60-second enzymatic period?

How does varying soil moisture content (10%, 20%, 30%, 40%, 50% water
content) affect microbial degradation of corn starch-based bioplastic, measured by percentage mass loss over 14 days at room temperature? - Biology IA exemplar

How does varying soil moisture content (10%, 20%, 30%, 40%, 50% water content) affect microbial degradation of corn starch-based bioplastic, measured by percentage mass loss over 14 days at room temperature?

To what extent does the concentration of tea tree oil (Melaleuca alternifolia) (0.0%, 20.0%,
40.0%, 60.0%, 80.0%, 100.0%) inhibit bacterial growth of E.coli, measured using the Mean
Diameter of Zone of Inhibition (±0.1mm) over an incubation period of 24 hours at 25°C? - Biology IA exemplar

To what extent does the concentration of tea tree oil (Melaleuca alternifolia) (0.0%, 20.0%, 40.0%, 60.0%, 80.0%, 100.0%) inhibit bacterial growth of E.coli, measured using the Mean Diameter of Zone of Inhibition (±0.1mm) over an incubation period of 24 hours at 25°C?

How does matcha tea concentration (0%, 0.5%, 1.0%, and 2.0% w/v) affect the germination
outcome (germinated vs. not germinated) of Vigna radiata seeds after 72 hours, where
germination is defined as the visible protrusion of the radicle through the seed coat? - Biology IA exemplar

How does matcha tea concentration (0%, 0.5%, 1.0%, and 2.0% w/v) affect the germination outcome (germinated vs. not germinated) of Vigna radiata seeds after 72 hours, where germination is defined as the visible protrusion of the radicle through the seed coat?

Research question: How does the concentration of pectinase (Aspergillus aculeatus) solutions
(0%, 20%, 40%, 60%, 80%) influence the volume (cm³) of Malus domestica juice collected after
5 minutes of filtration? - Biology IA exemplar

Research question: How does the concentration of pectinase (Aspergillus aculeatus) solutions (0%, 20%, 40%, 60%, 80%) influence the volume (cm³) of Malus domestica juice collected after 5 minutes of filtration?

How does changing the pH level (4, 6, 7, 8, 9, 10 ± 0.1) affect the activity of trypsin in breaking down casein as measured by the time taken (in seconds ± 1 sec) for the black cross to become clearly visible at 25°C? - Biology IA exemplar

How does changing the pH level (4, 6, 7, 8, 9, 10 ± 0.1) affect the activity of trypsin in breaking down casein as measured by the time taken (in seconds ± 1 sec) for the black cross to become clearly visible at 25°C?

How do different varying temperatures (10.0, 20.0, 30.0,40.0 and
50.0 ± 0.05 ℃
) affect the rate(mg/dL·min⁻¹ ) at which lactase breaks down lactose,
measured through glucose concentration (mg/dl)
generated in a duration of 5 mins? - Biology IA exemplar

How do different varying temperatures (10.0, 20.0, 30.0,40.0 and 50.0 ± 0.05 ℃ ) affect the rate(mg/dL·min⁻¹ ) at which lactase breaks down lactose, measured through glucose concentration (mg/dl) generated in a duration of 5 mins?

To what extent does the incubation temperature (20°C, 30°C, 40°C, 50°C, and 60°C) affect the soluble protein concentration of lentil (Lens culinaris) extracts as determined by the Biuret test and measured using colourimetry? - Biology IA exemplar

To what extent does the incubation temperature (20°C, 30°C, 40°C, 50°C, and 60°C) affect the soluble protein concentration of lentil (Lens culinaris) extracts as determined by the Biuret test and measured using colourimetry?

“The effect of differences in temperature (-15°C, 7°C and 25°C) and environment on the pH of decaying strawberries.” - Biology IA exemplar

“The effect of differences in temperature (-15°C, 7°C and 25°C) and environment on the pH of decaying strawberries.”

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? - Biology IA exemplar

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?

To what extent do different natural inhibitors (Citric acid, ascorbic acid and vinegar acid) at 2% concentration inhibit the enzymatic browning of apples (Malus domestica) after 30 minutes of exposure to air? - Biology IA exemplar

To what extent do different natural inhibitors (Citric acid, ascorbic acid and vinegar acid) at 2% concentration inhibit the enzymatic browning of apples (Malus domestica) after 30 minutes of exposure to air?

How does varying concentration of lead (II) Nitrate, 0.00, 0.20M, 0.40M, 0.6M ,0.8M ,1.0M (±0.01M) affect the photosynthetic activity of Elodea canadensis plant measured by the volume of oxygen production in ml (±0.1) using a 25 ml gas syringe for a period of 30 minutes (±0.1s). - Biology IA exemplar

How does varying concentration of lead (II) Nitrate, 0.00, 0.20M, 0.40M, 0.6M ,0.8M ,1.0M (±0.01M) affect the photosynthetic activity of Elodea canadensis plant measured by the volume of oxygen production in ml (±0.1) using a 25 ml gas syringe for a period of 30 minutes (±0.1s).

What is the effect of simulated hot wind on the transpiration rate of five Australian native plants (River Red Gum, Kangaroo Paw, Grevillea 'Peaches and Cream', White Correa, and Common Fan Flower), as measured by a change in percentage loss ( %) in mass (g)? - Biology IA exemplar

What is the effect of simulated hot wind on the transpiration rate of five Australian native plants (River Red Gum, Kangaroo Paw, Grevillea 'Peaches and Cream', White Correa, and Common Fan Flower), as measured by a change in percentage loss ( %) in mass (g)?

How does increasing the duration of time 10, 20, 30, 40, and 50 minutes (± 0.5 s) affect the plasmolysis of Solanum tuberosum (potato) cylinders by measuring the change in mass of the potato cylinders using electronic balance when submerged in 0.8 mol dm-3 (± 0.01 mol dm⁻³) of sucrose (C12H22O11) solution at room temperature 20°C ± (1°C)? - Biology IA exemplar

How does increasing the duration of time 10, 20, 30, 40, and 50 minutes (± 0.5 s) affect the plasmolysis of Solanum tuberosum (potato) cylinders by measuring the change in mass of the potato cylinders using electronic balance when submerged in 0.8 mol dm-3 (± 0.01 mol dm⁻³) of sucrose (C12H22O11) solution at room temperature 20°C ± (1°C)?

In what ways does pH levels of 4.0, 5.0, 6.0, 7.0, and 8.0 affect the catalytic rate of alpha-amylase enzyme derived from the bacterium Bacillus subtilis for complete hydrolysis of starch as the rate is experimentally defined by the iodine-potassium iodide test? - Biology IA exemplar

In what ways does pH levels of 4.0, 5.0, 6.0, 7.0, and 8.0 affect the catalytic rate of alpha-amylase enzyme derived from the bacterium Bacillus subtilis for complete hydrolysis of starch as the rate is experimentally defined by the iodine-potassium iodide test?

Investigation on how the pH levels (2, 3, 5, 7, 10) affect the permeability of Beetroot (Beta vulgaris) cell membranes. - Biology IA exemplar

Investigation on how the pH levels (2, 3, 5, 7, 10) affect the permeability of Beetroot (Beta vulgaris) cell membranes.

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1. Essentials of the Internal Assessment
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2.1 Research design
34 minute read
2.2 Data analysis
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2.3 Conclusion
4 minute read
2.4 Evaluation
6 minute read
3. Examiners' insights
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4. Suggested timeline
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5. Marking toolkit
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6.1 Command term glossary
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6.2 IA checklist
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7. Student planning sheets
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