3. Bioturbation

Try these first

1. 1.

   What is bioturbation?

   Hint

   Think about the organisms that live in sediments.

2. 2.

   Name one type of bioturbator.

   Hint

   Consider organisms that live at the sediment-water interface.

3. 3.

   What best describes bioturbation?

   • A process only involving physical mixing of sediments.
   • The transport of chemicals by organic organisms.
   • A method of sediment removal from aquatic environments.

   Hint

   Focus on the role of living organisms in this process.

4. 4.

   True or False: Bioturbation significantly speeds up the process of chemical transport compared to diffusion.

   • True
   • False

   Hint

   Consider how bioturbation functions relative to diffusion.

5. 5.

   You conduct an experiment to compare chemical concentrations in sediments with and without bioturbators introduced. Discuss the potential results and the mechanism behind these observations.

   Hint

   Consider the roles of burrowing, egestion, and porosity.

6. 6.

   A river's sediment is known for its high organic content. Explain how bioturbation could differ in this scenario compared to sandy, low-organic sediments.

   Hint

   Think about how organic matters might interact with chemicals differently.