Before You Begin
Question #46648
The Question
An ecotone typically exhibits high Net Primary Productivity (NPP) due to nutrient influx from adjacent zones. However, if severe waterlogging and a significant drop in temperature occur in this transition zone, altering the decomposition rate modifiers, which of the following represents the most accurate ecological consequence?
Options
- A.
The rate of mineralization will increase, leading to a higher standing state of inorganic nutrients in the soil.
- B.
The detritus food chain (DFC) will accelerate to compensate for the reduced efficiency of the grazing food chain (GFC).
- C.
The ecotone will transition into a nutrient-sink where detritus accumulates, eventually decoupling NPP from nutrient availability.
- D.
The standing crop of producers will immediately increase due to the massive accumulation of undecomposed organic matter.
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
Optimal Foraging Theory|Sacred Groves as Refugia|Species-Area Relationship
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often confuse 'accumulation of organic matter' with 'availability of nutrients'.
The trap lies in assuming that more organic matter directly benefits producers.
Students must synthesize NCERT lines stating that plants absorb inorganic nutrients (via mineralization) and that anaerobiosis/low temperature inhibit this process.
Failing to distinguish between 'Standing Crop' (living biomass) and 'Standing State' (inorganic nutrients) leads to selecting Option D.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Organisms and Populations - Class 12 |
| Concept | Optimal Foraging Theory |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |