4.4 Water pollution Quiz
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5 questions, one answer each
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1. Which two nutrients most often cause eutrophication?
- A. Nitrates and phosphates
- B. Oxygen and carbon dioxide
- C. Sodium and chlorine
- D. Iron and calcium
2. BOD measures:
- A. Oxygen used by microorganisms to decompose organic matter
- B. Oxygen produced by plants
- C. Nitrate concentration
- D. Water temperature
3. Which is a way of intercepting nutrients before they reach a lake?
- A. Dredging sediments
- B. A buffer strip of vegetation
- C. Banning plastic bags
- D. Adding oxygen to the lake
4. What causes the death of fish in the later stages of eutrophication?
- A. Too much light
- B. Lack of dissolved oxygen
- C. Cold water
- D. Excess oxygen
5. A river's WQI falls from 80 to 30. This shows:
- A. Water quality has improved
- B. Water quality has become worse
- C. BOD fell
- D. Nothing about quality