Professional Courses
Industry-relevant training in Business, Technology, and Design to help professionals and graduates upskill for real-world careers.
Categories
Interactive Games
Fun, engaging games to boost memory, math fluency, typing speed, and English skills—perfect for learners of all ages.
Typing
Memory
Math
English Adventures
Knowledge
Enroll to start learning
You’ve not yet enrolled in this course. Please enroll for free to listen to audio lessons, classroom podcasts and take practice test.
Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
Define BOD.
💡 Hint: Think about what happens to oxygen when organic matter is present.
Question 2
Easy
What does COD measure?
💡 Hint: Consider both biological and non-biological reactions.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What is the purpose of BOD?
- Measure living organisms' activity
- Total oxygen used by an ecosystem
- Overall water purity
💡 Hint: Consider biological demands for oxygen as related to organic substances.
Question 2
True or False: A bioassay is used to determine only chemical composition.
- True
- False
💡 Hint: Reflect on the role of living organisms in testing for toxicity.
Solve 1 more question and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
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.
Question 2
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.
Challenge and get performance evaluation