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

6.) How do varying salinity levels affect the rate of germination in the grass species Spartina anglica and Eragrostis plana?”

Experimental setup:

Use different concentrations of salinity levels in petri dishes with the two different grass species and compare the rate of gemination over a period of time. Repeat for five trials.

Independent Variable:

Salinity levels

Dependent Variable:

Germination rate

7.) What is the effect of potassium ion concentration (ppm) on the initial (day 0 to day 2) rate of growth of Hygrophilla difformis through mass change per day (g/day) over a period of 1 week?

Experimental setup: 

Use various concentrations of potassium in the soil in which the Hygrophilla difformis has been planted to asses rate of growth over 1 week. Compare the different pots containing varied concentrations to conclude on the optimum level.

Independent Variable: 

Potassium concentration

Dependent Variable: 

Rate of growth

8.) Effect of different concentrations of fertilisers on growth of Solanum lycopersicum.

Experimental setup:

In various pots (atleast 5) containing Solanum lycopersicum, add varied levels of fertiliser concentration and assess rate of growth over a period of time.

Independent Variable:

Fertilizer concentration

Dependent Variable:

Rate of growth

9.) Effects of the addition of different concentrations of 11% humic acid and 5% fulvic acid on rate of growth and fruit development in Solanum lycopersicum L.

Experimental setup:

Take the required number of pots, and add humic and fluvic acid to Solanum Lycopersicum in soil of varying concentrations and asses the rate of growth over and fruit development over a fixed period of time. Compare the different pots containing varied concentrations to conclude on the optimum combination.

Independent Variable:

Mixture of humic and fulvic acid

Dependent Variable:

Rate of change of the height of the plant

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

6.) What is the effect of changing the light intensity on the speed of wood louse Armadillidium Vulgare?

Experimental setup:

Use atleast 5 different light intensities in an enclosed glass container with the wood louse Armadillidium Vulgare and capture the movement of the creature to asses speed.

Independent Variable:

Light Intensity

Dependent Variable:

Speed

7.) Comparing the vitamin C or ascorbic acid concentration in store-bought fruit juices and fresh fruits using a titrimetric method.

Experimental setup:

Fruit samples must be blended with metaphosphoric acid. The homogenous mixture must be measured around and diluted into a volumetric flask with metaphosphoric acid (HPO3). The diluted sample must then be filtered to remove away suspension using a vacuum pump before 10 ml aliquote of the filtrate is pipetted into a small Erlenmeyer flask. The filtrate must be immediately titrated with a dye solution to a faint pink endpoint.

Independent Variable:

Type of packed and fresh juices

Dependent Variable:

Amount of iodine, types of fruits

8.) An Investigation on the Effect of Varying Concentrations of Amino Acid Glycine on the Seed Germination of Phaseolus vulgaris Seeds.

Experimental setup:

Take the required number of petri dishes, and add varying concentrations of amino acid glycine to Phaseolus vulgaris Seeds. Asses the rate of germination over a fixed period of time and compare results to optimum concentration.

Independent Variable:

Varying concentrations of Glycine

Dependent Variable:

Seed germination

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