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Class 12 Biology Practice Test: Environmental Issues - Biomagnification and Eutrophication
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Class 12 Biology Practice Test: Environmental Issues - Biomagnification and Eutrophication
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15 Questions

1. What happens when phosphorus, nitrates, and detergents in water lead to an acceleration in the growth of algae?
2. What happens to the concentration of DDT in each trophic level?
3. When do the planktonic algae utilize oxygen?
4. How is the value of COD compared to BOD?
5. What is the reason for the reduction in dissolved oxygen?
6. Which of the following is a secondary treatment for water pollution?
7. What happens when phosphorus, nitrates, and detergents in water lead to an acceleration in the growth of algae?
8. Which of the following is a primary treatment for water pollution?
9. What is the acceleration in the natural aging process of the lake due to the release of effluents from the industries called?
10. What happens to the concentration of DDT in each trophic level?
11. What phenomenon occurs due to the accumulation of certain pollutants that increase in concentration along the food chain?
12. Which of the following is the test to the determine amount of oxygen needed to oxidize all pollution materials?
13. What happens when water is deoxygenated due to algal growth?
14. What is the increased productivity of ponds and lakes due to excess nutrients called?
15. What is the reason for choking of the surface off any pond or lake?

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