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Question #46575
The Question
Cultural eutrophication accelerates the natural aging of a lake via the influx of nitrates and phosphates, fundamentally altering the standard trajectory of hydrarch succession. Which of the following is an INCORRECT consequence of this process?
Options
- A.
Dense algal blooms in the photic zone block sunlight, leading to the death of benthic flora and the truncation of the 'submerged plant stage'.
- B.
The Biochemical Oxygen Demand (BOD) spikes as aerobic decomposers rapidly multiply to break down the massive influx of dead organic matter.
- C.
The continuous nutrient enrichment promotes a stable, highly diverse aerobic food web, prolonging the intermediate seral stages before climax.
- D.
The rapid accumulation of organic detritus and silt forces a premature transition of the lake basin toward high sedimentation and anaerobic dominance.
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Comparative_Analysis
Sharpen your ability to evaluate multiple scenarios and distinguish between competing potential answers.
Concepts Behind This Question
Hydrarch vs Xerarch Convergence|BOD Logic|Primary vs Secondary Sewage Treatment
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: The 'Nutrient = Health' Misconception.
Students often intuitively associate 'nutrient enrichment' with increased ecosystem health, stability, and biodiversity.
In terrestrial systems, fertilizers boost plant growth, but in aquatic systems (eutrophication), excessive nutrients trigger a catastrophic chain reaction: algal bloom -> light blockage -> death of submerged plants -> decomposer population explosion -> DO depletion -> death of aerobic fauna.
This effectively truncates the natural, slow seral stages of hydrarch succession.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Microbes in Human Welfare - Class 12 |
| Concept | BOD (Biochemical Oxygen Demand) Logic |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |