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Question #46658
The Question
In a specific terrestrial ecosystem, the detritus food chain (DFC) exhibits a significantly prolonged fragmentation and catabolism phase, leading to a depleted pool of inorganic nutrients in the soil reservoir. Assuming climatic factors (temperature and soil moisture) are optimal for decomposers, which of the following best explains the underlying mechanism and its subsequent ecological impact?
Options
- A.
The detritus is rich in nitrogen and water-soluble substances, which slows down the transition from humification to mineralization, locking nutrients in the detritus.
- B.
The detritus has high lignin and chitin content, which retards catabolism and humification, creating a negative feedback loop on primary productivity due to nutrient immobilization.
- C.
The detritus has high lignin and chitin content, which directly inhibits the leaching of inorganic salts, causing a rapid accumulation of available nutrients in the topsoil.
- D.
The detritus is rich in lignin and chitin, which accelerates the fragmentation phase but completely halts mineralization, leading to a permanent climax community.
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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
Stratification Efficiency|Diversity-Stability Relationship|Rivet Popper Hypothesis
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often memorize that 'lignin and chitin slow decomposition' but fail to connect this to the broader ecosystem impacts.
The trap lies in understanding how delayed mineralization leads to nutrient immobilization, which subsequently acts as a negative feedback loop on primary productivity by depleting the standing state of the soil.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Ecosystem - Class 12 |
| Concept | Stratification Efficiency |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |