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Question #46570
The Question
During secondary sewage treatment, the vigorous growth of aerobic microbes forms 'flocs'. If an industrial effluent containing high concentrations of the bioactive molecule produced by Trichoderma polysporum is accidentally introduced into the aeration tank, which of the following is the most likely consequence?
Options
- A.
The biochemical oxygen demand (BOD) of the effluent will decrease rapidly due to the immunosuppressive action of the molecule on pathogenic bacteria.
- B.
The structural integrity of the flocs will be disrupted due to the inhibition of fungal filaments, resulting in a slower reduction of BOD.
- C.
The production of biogas will prematurely initiate in the aeration tank due to the stimulation of methanogenic bacteria.
- D.
The primary treatment efficiency will decrease as the molecule prevents the sequential filtration and sedimentation of grit.
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
Trichoderma polysporum|Flocs|Activated Sludge
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Synthesizing the structural composition of 'flocs' (bacteria + fungal filaments) with the ecological biocontrol/antifungal properties of Trichoderma.
Common Misconception: Students often memorize Cyclosporin A solely as a clinical 'immunosuppressant' and fail to apply its ecological role to the fungal components of sewage flocs, or they confuse the aerobic events of the aeration tank with the anaerobic sludge digester.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Microbes in Human Welfare - Class 12 |
| Concept | Primary vs Secondary Sewage Treatment |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |