50+ IB Biology IA Ideas
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IB Biology SL IA Ideas
1.) How do different sodium chloride concentrations affect seed germination in the bougainvillaea plant?
Experimental setup:
Soak the bougainvillaea seeds in sodium chloride of varying concentrations for a specific time period. Place them in Petri dishes and count the number of seeds that germinate. Conduct at least 5 trials, excluding control.
Independent Variable:
Sodium chloride concentrations
Dependent Variable:
Seed germination percentage
2.) How does extract of the seeds and the leaves of the moringa plant (herbal medicine) show antifungal activity against the Malassezia yeast (Pittosporum) fungi?
Experimental setup:
Mix yeast and herbal medicine. Then use agar plates and fungus to test their effectiveness by seeing how many fungi grow in the different plates.
Independent Variable:
Seeds and the leaves of the moringa plant
Dependent Variable:
Antifungal activity
3.) How does the concentration of zinc chloride affect the growth of plaque?
Experimental setup:
Mix different concentrations of zinc chloride in different agar plates and bacteria, and check for plaque formation over time.
Independent Variable:
Concentration of zinc chloride
Dependent Variable:
Growth of plaque
4.) How effective are synthetic antibacterial products compared to natural antibacterial products against the growth of Cut bacterium acne?
Experimental setup:
Chose a synthetic and natural antibacterial product and mix them with a little water to create diluted solutions of them. Then use agar plates and bacteria to test their effectiveness by seeing how many bacteria grow in the different plates.
Independent Variable:
Types of antibacterial products (Natural vs synthetic)
Dependent Variable:
Growth of Cut bacterium acne
5.) How do the different teas, used to water Vignata radiata seeds, affect the germination rate?
Experimental setup:
Place Viganata radiata seeds into various Petri dishes of the same number. Water them regularly using a diluted solution of different types of teas. Count the number of seeds that germinate over time and take note. Repeat the same procedure 5 times, including control.
Independent Variable:
The different types of teas (green tea, chamomile, etc)
Dependent Variable:
The rate of germination of Vignata radiata
IB Biology HL IA Ideas
1.) How do temperature and light intensity that affects photosynthesis balance out each other when it comes to the time taken for photosynthesis to occur?
Experimental setup:
Expose selected plants with different levels of temperature and light intensity to find the optimum combination for maximum growth rate. Conduct at least 5 trials, excluding control.
Independent Variable:
Temperature and light intensity
Dependent Variable:
Time taken for photosynthesis
2.) To what extent does scarification have an effect on germination percentage and shoot growth?
Experimental setup:
Select a seed that requires scarification and treat it with different methods of scarification like heat, acid and freeze-thaw. Conduct at least 5 trials, excluding control. Compare results to conclude which scarification is most effective.
Independent Variable:
Types of scarification
Dependent Variable:
Germination percentage and shoot growth
3.) How do cumin and turmeric powder, in comparison to indigestion tablets, affect the rate of neutralization of hydrochloric acid, measured by the difference of change in pH levels in 5 minutes?
Experimental setup:
Measure every 5 minutes, the amount of time it takes for the pH of hydrochloric acid to reach a neutral state (pH of 7) when adding cumin and turmeric powder to one sample and indigestion tablets to another sample. Conduct at least 5 trials, excluding control.
Independent Variable:
Cumin and turmeric powder
Dependent Variable:
Rate of neutralization of hydrochloric acid
4.) How do different concentrations of Gibberellic acid affect the germination of a Dolly Parton rose?
Experimental setup:
Soak the Dolly Parton rose seeds in Gibberellic acid of varying concentrations for a specific time period. Place them in Petri dishes and count the number of seeds that germinate. Conduct at least 5 trials, excluding control.
Independent Variable:
Different concentrations of Gibberellic acid
Dependent Variable:
Germination of a Dolly Parton rose
5.) What is the effect of different concentrations of green tea extract on the rate of fermentation of yeast?
Experimental setup:
Add yeast to various Petri dishes containing water with different concentrations of green tea extract. Over time, calculate the pH to determine the level of carbon dioxide produced by the yeast.
Independent Variable:
Different concentrations of green tea extract
Dependent Variable:
Change in carbon dioxide concentration produced by yeast
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