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Question #45583
The Question
Due to a mechanical failure, the agitators and air pumps in the aeration tanks of a municipal sewage treatment plant cease functioning. The partially treated water is subsequently discharged into a nearby river. Which of the following statements regarding the resulting ecological and public health cascade is INCORRECT?
Options
- A.
The Biological Oxygen Demand (BOD) of the discharged effluent will remain high due to the impaired growth of aerobic microbial flocs.
- B.
A sharp decline in dissolved oxygen (DO) in the river will occur, leading to the death of aerobic aquatic life.
- C.
The inability of anaerobic sludge digesters to process the primary effluent will directly cause a surge in waterborne pathogen loads.
- D.
The local community may experience a localized reversal of the epidemiological transition due to increased mortality from waterborne diseases.
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Regulatory_Failure
Understand how NOT, EXCEPT, and logical constraints are used to manipulate exam results.
Concepts Behind This Question
Primary_vs_Secondary_Sewage_Treatment|Public_Health_Indicators|Microbes_in_Human_Welfare
Why This Question Is Tricky
Common Mistakes
Process Sequence Trap: The conceptual pivot relies on the exact sequence of sewage treatment.
Students often confuse the substrates for different microbial processes.
The trap falsely states that anaerobic digesters process 'primary effluent', whereas NCERT explicitly states primary effluent goes to the aerobic aeration tanks, and only the subsequent 'activated sludge' (settled flocs) is pumped into the anaerobic sludge digesters.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Reproductive Health - Class 12 |
| Concept | Public Health Indicators |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |