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A1.1.6—Physical properties of water and the consequences for animals in aquatic habitats


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

Investigating Dissolved Oxygen

Experiment #16 from Investigating Biology through Inquiry

In this Preliminary Activity, you will gain experience using a Dissolved Oxygen Probe as you determine the DO level of a water sample provided by your teacher.

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

  • water pollution
  • eutrophication
  • thermal pollution
  • photosynthesis
  • cellular respiration

Dissolved Oxygen in Water

Experiment #19 from Biology with Vernier

In this experiment, you will

  • Use a Dissolved Oxygen Probe to measure the concentration of dissolved oxygen in water.
  • Study the effect of temperature on the amount of dissolved oxygen in water.
  • Predict the effect of water temperature on aquatic life.

Educational Standard
International Baccalaureate (IB) 2025
A Unity and Diversity
Level of organization
1 Molecules
A1.1 Water
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.