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Question #47516
The Question
Sphagnum (peat moss) often acts as a critical pioneer or early successional species in hydrarch succession. It modifies its microhabitat by altering decomposition rates and soil chemistry. Regarding this autogenic succession, which of the following statements is INCORRECT?
Options
- A.
The bryophyte induces acidification via H+ ion exchange, which severely inhibits the extracellular enzymes of decomposer microbes, slowing down detritus breakdown.
- B.
Slower decomposition rates lead to the sequestration of minerals in the humic layer, causing nutrient immobilization and temporarily altering local productivity ratios.
- C.
The continuous accumulation of peat permanently amplifies the habitat's water-retention capacity, allowing the pioneer bryophytes to persist as the stable climax community.
- D.
The accumulation of organic matter raises the soil profile, eventually reducing surface moisture and triggering autogenic replacement by subsequent seral stages.
Check Your Answer
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
Adaptive Radiation Logic|Bryophyte Dependence Mechanics|Algal Thallus Organization
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often confuse the individual physiological trait of Sphagnum (high water-holding capacity) with the ecosystem-level consequence of its long-term growth (raising the soil profile, which ultimately leads to a drier surface).
The trap exploits the misconception that pioneer species create conditions to sustain themselves indefinitely, whereas in autogenic succession, pioneers alter the environment to their own detriment, paving the way for the next seral stage.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Plant Kingdom - Class 11 |
| Concept | Bryophyte Dependence Mechanics |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |