MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Biology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What is the acceleration in the natural aging process of the lake due to the release of effluents from the industries called? |
| A. | Accelerated Eutrophication |
| B. | Eutrophication |
| C. | Sedimentation |
| D. | Bioamplification |
| Answer» B. Eutrophication | |
| 2. |
What happens in the tertiary treatment for water pollution? |
| A. | Sedimentation |
| B. | Filtration |
| C. | Sludge method |
| D. | Removal of nitrates, phosphates |
| Answer» E. | |
| 3. |
Which of the following is a secondary treatment for water pollution? |
| A. | Sedimentation |
| B. | By the action of microbes |
| C. | Removal of nitrates |
| D. | Filtration |
| Answer» C. Removal of nitrates | |
| 4. |
Which of the following is a primary treatment for water pollution? |
| A. | Sludge method |
| B. | Trickling filter method |
| C. | Sedimentation |
| D. | Removal of nitrates |
| Answer» D. Removal of nitrates | |
| 5. |
What happens to the concentration of DDT in each trophic level? |
| A. | Decrease |
| B. | Increases |
| C. | Remains unchanged |
| D. | Becomes zero |
| Answer» C. Remains unchanged | |
| 6. |
Which of the following is an example of pollutants whose concentration increases in each trophic level? |
| A. | Potassium |
| B. | Glucose |
| C. | DDT |
| D. | Nitrogen |
| Answer» D. Nitrogen | |
| 7. |
What phenomenon occurs due to the accumulation of certain pollutants that increase in concentration along the food chain? |
| A. | Eutrophication |
| B. | Pollution |
| C. | Deforestation |
| D. | Bio-magnification |
| Answer» E. | |
| 8. |
What is the reason for choking of the surface off any pond or lake? |
| A. | Nutrients |
| B. | Fecal matter |
| C. | Algal bloom |
| D. | Bacteria |
| Answer» D. Bacteria | |
| 9. |
When do the planktonic algae utilize oxygen? |
| A. | Day |
| B. | Afternoon |
| C. | Evening |
| D. | Night |
| Answer» E. | |
| 10. |
What is the reason for the reduction in dissolved oxygen? |
| A. | Bio-magnification |
| B. | Eutrophication |
| C. | Extinction |
| D. | Pollution |
| Answer» C. Extinction | |
| 11. |
What is the increased productivity of ponds and lakes due to excess nutrients called? |
| A. | Bio-magnification |
| B. | Extinction |
| C. | Eutrophication |
| D. | Deforestation |
| Answer» D. Deforestation | |
| 12. |
What happens when water is deoxygenated due to algal growth? |
| A. | Increase in the number of fishes |
| B. | Increase in the number of aquatic plants |
| C. | Eutrophication |
| D. | Death of aquatic animals |
| Answer» E. | |
| 13. |
What happens when phosphorus, nitrates, and detergents in water lead to an acceleration in the growth of algae? |
| A. | Extinction |
| B. | Eutrophication |
| C. | Increase in the number of fishes |
| D. | Increase in the number of aquatic plants |
| Answer» C. Increase in the number of fishes | |
| 14. |
How is the value of COD compared to BOD? |
| A. | Much higher |
| B. | Zero |
| C. | Much lower |
| D. | Low |
| Answer» B. Zero | |
| 15. |
Which of the following is the test to the determine amount of oxygen needed to oxidize all pollution materials? |
| A. | Biological Oxygen Demand |
| B. | Chemical Oxygen Demand |
| C. | Botanical Oxygen Demand |
| D. | Physical Oxygen Demand |
| Answer» C. Botanical Oxygen Demand | |