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Question #46588
The Question
A marshy wetland ecosystem experiences a sudden influx of acidic industrial runoff, significantly lowering the soil pH. Based on the NCERT principles of decomposition and biological classification, what is the most likely systemic consequence on the ecosystem's nutrient cycling?
Options
- A.
Methanogenic archaebacteria are inhibited, causing an accumulation of organic acids that halts mineralization and subsequently decreases Net Primary Productivity (NPP).
- B.
Catabolism by acidophilic fungi is enhanced, bypassing humification to directly accelerate mineralization and increase Gross Primary Productivity (GPP).
- C.
The acidic environment promotes rapid leaching of water-soluble inorganic nutrients, leading to an immediate and sustained increase in the ecosystem's NPP.
- D.
Humification is accelerated due to the inhibition of acidogenic bacteria, locking nutrients in a dark amorphous substance and increasing NPP.
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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
Methanogens|Humification|Decomposition|Ecosystem_Resilience
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often memorize the 5 steps of decomposition (Fragmentation, Leaching, Catabolism, Humification, Mineralization) without linking them to specific microbial tolerances (Methanogens in marshy areas) and ecosystem-level outcomes (NPP).
The trap lies in assuming acidic environments universally accelerate chemical breakdown, failing to recognize that biological mineralization is pH-dependent and its cessation directly starves producers.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Microbes in Human Welfare - Class 12 |
| Concept | Methanogens Metabolism |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |