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Question #46659
The Question
In a stable climax forest ecosystem, the detritus is typically rich in lignin and chitin, promoting a slow rate of decomposition. If a prolonged environmental shift (e.g., increased soil temperature and aeration) disproportionately accelerates mineralization while inhibiting humification, which of the following will be the most likely long-term ecological consequence?
Options
- A.
Accumulation of a dark-coloured, amorphous substance that is highly resistant to microbial action.
- B.
A sustained increase in net primary productivity (NPP) due to the continuous and rapid release of inorganic nutrients.
- C.
Depletion of the soil's colloidal reservoir, leading to severe nutrient leaching and structural degradation of the climax community.
- D.
Immediate transition of the ecosystem to a pioneer seral stage due to the complete cessation of the detritus food chain.
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Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Evolutionary_Exception
Tackle problems where standard rules evolve or change based on specific environmental constraints.
Concepts Behind This Question
Stratification Efficiency|Ecotone and Edge Effect|Species-Area Relationship
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often equate 'mineralization' strictly with 'increased nutrient availability for plants' (a positive outcome).
The trap lies in failing to recognize the structural role of humus.
Without the colloidal properties of humus (formed via humification) to hold these inorganic ions, rapid mineralization inevitably leads to nutrient leaching and ecosystem collapse.
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 |