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IB Biology IA Exemplars

View exemplars for IB Biology IA coursework, verified with scores by IB examiners.

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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 scored 7

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? - Biology IA exemplar scored 7

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? - Biology IA exemplar scored 7

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?

What is the effect of increasing sodium chloride concentration (0.00M, 0.05M, 0.10M, 0.15M, 0.20M) on the promotion of radish (Raphanus sativus) seed germination by 50ppm of exogenous Gibberelic Acid (C19H22O6), measured by the germination rate of GA3-primed seeds and the average radicle length of radicles stemming from GA3-primed seeds, compared to H2O-primed seeds, recorded after 7 days? - Biology IA exemplar scored 7

What is the effect of increasing sodium chloride concentration (0.00M, 0.05M, 0.10M, 0.15M, 0.20M) on the promotion of radish (Raphanus sativus) seed germination by 50ppm of exogenous Gibberelic Acid (C19H22O6), measured by the germination rate of GA3-primed seeds and the average radicle length of radicles stemming from GA3-primed seeds, compared to H2O-primed seeds, recorded after 7 days?

What is the optimal concentration of monosodium glutamate, MSG, (0.0% control, 0.5%, 1.0%, 1.5%, 2.0%) as supplements for enhancing Ipomoea aquatica (water spinach) plant growth by measuring the chlorophyll concentration of the leaf after submerged in treatment solutions for 24 hours on a spectrophotometer and calculated using Beer-Lambert law? - Biology IA exemplar scored 7

What is the optimal concentration of monosodium glutamate, MSG, (0.0% control, 0.5%, 1.0%, 1.5%, 2.0%) as supplements for enhancing Ipomoea aquatica (water spinach) plant growth by measuring the chlorophyll concentration of the leaf after submerged in treatment solutions for 24 hours on a spectrophotometer and calculated using Beer-Lambert law?

How does the annual HIV incidence rate correlate with the mortality rate
from non-Hodgkin lymphoma in Indonesia from 1990 to 2020? - Biology IA exemplar scored 6

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? - Biology IA exemplar scored 6

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 - Biology IA exemplar scored 6

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? - Biology IA exemplar scored 6

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? - Biology IA exemplar scored 6

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? - Biology IA exemplar scored 6

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)? - Biology IA exemplar scored 6

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)?

This investigation aims to determine the effect of how changing the concentration(0.010g/100g of soil, 0.050g/100g of soil, 0.150g/100g of soil, 0.500g/100g of soil, 1.000g/100g of soil,) of microplastics in soil affects the concentration of chlorophyll a and b in Common Oats (Avena sativa) calculated through the measurement of the absorbance of the chlorophyll extract at 645 nm and 663 nm from a spectrophotometer. - Biology IA exemplar scored 6

This investigation aims to determine the effect of how changing the concentration(0.010g/100g of soil, 0.050g/100g of soil, 0.150g/100g of soil, 0.500g/100g of soil, 1.000g/100g of soil,) of microplastics in soil affects the concentration of chlorophyll a and b in Common Oats (Avena sativa) calculated through the measurement of the absorbance of the chlorophyll extract at 645 nm and 663 nm from a spectrophotometer.

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? - Biology IA exemplar scored 6

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 - Biology IA exemplar scored 6

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? - Biology IA exemplar scored 6

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? - Biology IA exemplar scored 6

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)? - Biology IA exemplar scored 5

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? - Biology IA exemplar scored 5

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?

How does varying soil acidity affect the growth rate of the plant height of Raphanus sativus in a mesocosm environment? - Biology IA exemplar scored 5

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

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? - Biology IA exemplar scored 5

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? - Biology IA exemplar scored 5

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 - Biology IA exemplar scored 5

EFFECT OF DIFFERENT POTASSIUM CHLORIDE CONCENTRATIONS ON RADISH SEEDS

¿Existe una correlación entre las distintas concentraciones de abono NPK (en ml/l de agua) con el desarrollo de la germinación de las plantas, utilizando semillas de judía (Phaseolus vulgaris) y girasol (Helianthus annuus), teniendo en cuenta su peso fresco (en g), longitud de tallo y raíces (en cm), diámetro de hoja (en cm) y número de germinaciones totales después de una semana de la siembra como referencia de desarrollo? - Biology IA exemplar scored 5

¿Existe una correlación entre las distintas concentraciones de abono NPK (en ml/l de agua) con el desarrollo de la germinación de las plantas, utilizando semillas de judía (Phaseolus vulgaris) y girasol (Helianthus annuus), teniendo en cuenta su peso fresco (en g), longitud de tallo y raíces (en cm), diámetro de hoja (en cm) y número de germinaciones totales después de una semana de la siembra como referencia de desarrollo?

What is the effect of molar concentration of NaCl solutions (0.0, 0.2, 0.4, 0.6, 0.8, 1.0 M) on the rate of osmosis measured by the conductivity of solution by a conductivity probe (μS/cm) and change in mass of the Solanum lycopersicum var. cerasiforme after having them submerged in solution for a period of 4 days? - Biology IA exemplar scored 5

What is the effect of molar concentration of NaCl solutions (0.0, 0.2, 0.4, 0.6, 0.8, 1.0 M) on the rate of osmosis measured by the conductivity of solution by a conductivity probe (μS/cm) and change in mass of the Solanum lycopersicum var. cerasiforme after having them submerged in solution for a period of 4 days?

How do different concentrations of Carbon Dioxide affect the change in height (biomass indicator), hence the photosynthesis rate of allium schoenoprasum ? - Biology IA exemplar scored 5

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? - Biology IA exemplar scored 5

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?

How does varying salinity a1ect the hatching rate, growth, and
swimming speed of Artemia over a three-day period? - Biology IA exemplar scored 4

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

How do fructose levels in different types of organic and non-organic fruits(orange, lemon, apple, grapes) differ from each other? - Biology IA exemplar scored 4

How do fructose levels in different types of organic and non-organic fruits(orange, lemon, apple, grapes) differ from each other?

What are the differences in the composition of photosynthetic pigments among
different species of the Miconia genus (Miconia lacera, Miconia crenata, Miconia
mayeta, and Miconia calvescens), as revealed by paper chromatography and
absorption spectrum at wavelengths 450nm, 500nm, 550nm, 570nm, 600nm, and
650nm? - Biology IA exemplar scored 4

What are the differences in the composition of photosynthetic pigments among different species of the Miconia genus (Miconia lacera, Miconia crenata, Miconia mayeta, and Miconia calvescens), as revealed by paper chromatography and absorption spectrum at wavelengths 450nm, 500nm, 550nm, 570nm, 600nm, and 650nm?

How do different concentrations of Vitamin C from Citrus reticulata (mandarin), Citrus
paradisi (grapefruit), Citrus limon (lemon), and a standardized Vitamin C solution (from
tablets) influence the prevention of apple browning over a period of 1 hour, as measured
by light absorption at specific wavelengths using a colorimeter? - Biology IA exemplar scored 3

How do different concentrations of Vitamin C from Citrus reticulata (mandarin), Citrus paradisi (grapefruit), Citrus limon (lemon), and a standardized Vitamin C solution (from tablets) influence the prevention of apple browning over a period of 1 hour, as measured by light absorption at specific wavelengths using a colorimeter?

How do different storage conditions affect the rate of milk spoilage? - Biology IA exemplar scored 3

How do different storage conditions affect the rate of milk spoilage?

How do molasses, honey, and milk at different concentrations (10%,
20%, 30%, 40%, 50%) affect the anaerobic respiration in
Saccharomyces cerevisiae (yeast)? - Biology IA exemplar scored 4

How do molasses, honey, and milk at different concentrations (10%, 20%, 30%, 40%, 50%) affect the anaerobic respiration in Saccharomyces cerevisiae (yeast)?

What is the substrate type's (Glucose, Fructose, Galactose, Sucrose, Maltose, Starch) effect on the rate (ppm/min) of respiration in yeast (Saccharomyces cerevisiae), as measured by the change in CO2 concentration (ppm) over 600 seconds? - Biology IA exemplar scored 5

What is the substrate type's (Glucose, Fructose, Galactose, Sucrose, Maltose, Starch) effect on the rate (ppm/min) of respiration in yeast (Saccharomyces cerevisiae), as measured by the change in CO2 concentration (ppm) over 600 seconds?

How do different concentrations of black tea (0%, 1%, 2%, 3%, 4%, 5%) impact the rate of digestion of proteins in Bovine Serum Albumin, when exposed to papain enzyme for 20 minutes? - Biology IA exemplar scored 6

How do different concentrations of black tea (0%, 1%, 2%, 3%, 4%, 5%) impact the rate of digestion of proteins in Bovine Serum Albumin, when exposed to papain enzyme for 20 minutes?

The Impact of Adding Different types of Sweeteners on the Rate of Anaerobic Respiration of Saccharomyces cerevisiae. - Biology IA exemplar scored 7

The Impact of Adding Different types of Sweeteners on the Rate of Anaerobic Respiration of Saccharomyces cerevisiae.

How does the diversity of aquatic invertebrates differ between a boating area and a natural area (an environment that has not been altered by human activities) of Danson Lake, Welling DA6 8HL, in June 2024? - Biology IA exemplar scored 5

How does the diversity of aquatic invertebrates differ between a boating area and a natural area (an environment that has not been altered by human activities) of Danson Lake, Welling DA6 8HL, in June 2024?

How do different types of traditional medicine ingredients, such as turmeric (Curcuma longa), ginger (Zingiber officinale), tamarind (Tamarindus indica), lemongrass (Cymbopogon citratus), and cinnamon (Cinnamomum verum), exhibit antimicrobial activity against the growth of Escherichia coli? - Biology IA exemplar scored 7

How do different types of traditional medicine ingredients, such as turmeric (Curcuma longa), ginger (Zingiber officinale), tamarind (Tamarindus indica), lemongrass (Cymbopogon citratus), and cinnamon (Cinnamomum verum), exhibit antimicrobial activity against the growth of Escherichia coli?

The effect of milk fat percentage and tea temperature on the formation of a film layer on tea - Biology IA exemplar scored 3

The effect of milk fat percentage and tea temperature on the formation of a film layer on tea

Study of the effect of running session times (6:00, 10:00 , 12:00 , 16:00, 20:00) on heart rate response in a male participant aged 18 during 5 minute exercise intervals - Biology IA exemplar scored 4

Study of the effect of running session times (6:00, 10:00 , 12:00 , 16:00, 20:00) on heart rate response in a male participant aged 18 during 5 minute exercise intervals

Investigating the effects of different wavelengths (nm) on Vigna Radiata stem elongation. - Biology IA exemplar scored 4

Investigating the effects of different wavelengths (nm) on Vigna Radiata stem elongation.

Investigating the most effective amount of Lactaid tablets to digest lactose in 100ml of milk. - Biology IA exemplar scored 7

Investigating the most effective amount of Lactaid tablets to digest lactose in 100ml of milk.

To what extent do different pH levels of sodas (Coca-Cola original 2.52, Fanta orange 2.73, Coke Zero 3.18, Mountain Dew 3.22, Schweppes soda water 5.14) affect the deterioration of "tooth enamel" (bovine teeth representing human teeth), measured using a mass difference after a 7-day period? - Biology IA exemplar scored 6

To what extent do different pH levels of sodas (Coca-Cola original 2.52, Fanta orange 2.73, Coke Zero 3.18, Mountain Dew 3.22, Schweppes soda water 5.14) affect the deterioration of "tooth enamel" (bovine teeth representing human teeth), measured using a mass difference after a 7-day period?

How do varying ethanol concentrations (15%, 30%, 45%, 60%, 75%) affect the membrane permeability of Beta vulgaris
cells, as quantified by betacyanin release measured via absorbance at 540 nm using a colorimeter after 10-minute
exposure? - Biology IA exemplar scored 5

How do varying ethanol concentrations (15%, 30%, 45%, 60%, 75%) affect the membrane permeability of Beta vulgaris cells, as quantified by betacyanin release measured via absorbance at 540 nm using a colorimeter after 10-minute exposure?

How does iron(ii)sulfate concentration (0.0M, 0.1M, 0.2M, 0.4M, 0.8M) affect the
enzymatic activity of catalase (from Bos taurus) measured from the increase in pressure
(kPa) inside an Erlenmeyer flask when hydrogen peroxide decomposes over a 60 second
period? - Biology IA exemplar scored 6

How does iron(ii)sulfate concentration (0.0M, 0.1M, 0.2M, 0.4M, 0.8M) affect the enzymatic activity of catalase (from Bos taurus) measured from the increase in pressure (kPa) inside an Erlenmeyer flask when hydrogen peroxide decomposes over a 60 second period?

How do different pH levels affect the growth of mung beans
(Vigna radiata) over 8 days measured by the root and stem length? - Biology IA exemplar scored 4

How do different pH levels affect the growth of mung beans (Vigna radiata) over 8 days measured by the root and stem length?

The Effect of Vitamin E on the Germination and Growth of Brassica Juncea Seeds - Biology IA exemplar scored 5

The Effect of Vitamin E on the Germination and Growth of Brassica Juncea Seeds

How do various concentrations of acid rain (0mL, 10mL, 20mL) affect the germination
rate of radish plants? - Biology IA exemplar scored 4

How do various concentrations of acid rain (0mL, 10mL, 20mL) affect the germination rate of radish plants?

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