4.2 - Summary of Methods and Reporting
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Practice Questions
Test your understanding with targeted questions
Define BOD.
💡 Hint: Think about what happens to oxygen when organic matter is present.
What does COD measure?
💡 Hint: Consider both biological and non-biological reactions.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is the purpose of BOD?
💡 Hint: Consider biological demands for oxygen as related to organic substances.
True or False: A bioassay is used to determine only chemical composition.
💡 Hint: Reflect on the role of living organisms in testing for toxicity.
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Challenge Problems
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Consider a lake with a BOD of 300 mg/L and a COD of 500 mg/L. Discuss the implications for the aquatic ecosystem and what potential actions can be taken.
💡 Hint: Link BOD values to oxygen availability and species health.
A bioassay reveals 70% mortality in a standard fish population within a polluted water body. Analyze what this indicates about the water quality and propose a follow-up investigation.
💡 Hint: Consider the relationship between toxicity and living organism health.
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