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Question #46662
The Question
In a highly stratified forest ecosystem, a massive shedding of leaves rich in lignin and chitin occurs, resulting in detritus with a very high Carbon-to-Nitrogen (C:N) ratio. Which of the following ecological events will most likely dominate the immediate nutrient cycling dynamics?
Options
- A.
The rate of mineralization will exceed humification, rapidly increasing the standing state of the soil.
- B.
Soil microbes will sequester available inorganic nutrients from the soil to degrade the detritus, leading to nutrient immobilization.
- C.
Fragmentation and leaching will accelerate, causing a rapid conversion of the standing crop into available soil nutrients.
- D.
The detritus food chain will bypass the microbial catabolism phase, directly transferring energy to the grazing food chain.
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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
10% Law|Lindeman_Efficiency|Carnivore_Metabolism
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often assume that a large addition of detritus immediately increases soil nutrients (Standing State).
However, they fail to account for substrate quality.
A high C:N ratio (lignin/chitin) triggers microbial 'Nutrient Immobilization' rather than immediate 'Mineralization', temporarily starving the ecosystem of available nutrients despite the high influx of dead biomass.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Ecosystem - Class 12 |
| Concept | Productivity Ratios |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |