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B4.2.3—Photosynthesis as the mode of nutrition in plants, algae and several groups of photosynthetic prokaryotes


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

Photosynthesis and Respiration (CO2)

Experiment #31B from Biology with Vernier

In this experiment, you will

  • Use a CO2 Gas Sensor to measure the amount of carbon dioxide consumed or produced by a plant during respiration and photosynthesis.
  • Determine the rate of respiration and photosynthesis of a plant.

Photosynthesis by Chloroplasts

Experiment #12 from Investigating Biology through Inquiry

In the Preliminary Activity, you will use a spectrophotometer to measure color changes in DPIP due to photosynthesis by chloroplasts.

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

  • photosynthesis
  • chlorophyll
  • chloroplast
  • ATP
  • electron transport chain

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.