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B4.2.2—Differences between organisms that are obligate anaerobes, facultative anaerobes and obligate aerobes


Here are experiments our science specialists have selected to support this IB* topic.

Fermentation with Yeast

Experiment #11 from Investigating Biology through Inquiry

In this Preliminary Activity, you will use a Gas Pressure Sensor to monitor the pressure inside a conical tube as yeast metabolizes glucose anaerobically. When data collection is complete, you will perform a linear fit on the resultant graph to determine the fermentation rate.

After completing the Preliminary Activity, you will first use reference sources to find out more about sugar fermentation by yeast before you choose and investigate a researchable question dealing with fermentation. Some topics to consider in your reference search are:

  • sugars
  • glucose
  • monosaccharides
  • disaccharides
  • fermentation
  • anaerobic respiration
  • aerobic respiration
  • yeast
  • enzyme
  • substrate
  • enzyme inhibitor

Aerobic Respiration

Experiment #17 from Biology with Vernier

In this experiment, you will

  • Measure changes in dissolved oxygen concentration.
  • Study the effect of temperature on cellular respiration.
  • Make a plot of the rate of cellular respiration as a function of temperature.

Educational Standard
International Baccalaureate (IB) 2025
B Form and function
Level of organization
4 Ecosystems
B4.2 Ecological niches
Standard level and higher level

* The IB Diploma Program is an official program of the International Baccalaureate Organization (IBO) which authorizes schools to offer it. The material available here has been developed independently of the IBO and is not endorsed by it.