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Question #46013
The Question
In an open ocean ecosystem exhibiting an inverted pyramid of biomass, an anthropogenic chemical pollutant drastically reduces the rate of benthic mineralization. Which of the following represents the most direct ecological consequence of this altered decomposition rate?
Options
- A.
The ecosystem's pyramid of energy will invert due to the massive accumulation of un-decomposed benthic detritus.
- B.
The primary productivity of the photic zone will decline rapidly due to the decoupling of nutrient cycling from the detritus compartment.
- C.
The standing crop of phytoplankton will increase as enhanced carbon sequestration at the benthic zone reduces dissolved CO2 toxicity.
- D.
Zooplankton will experience a population explosion due to reduced competition for dissolved oxygen in the benthic zone.
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
Humification vs Mineralization|Inverted Biomass Pyramids|Nutrient Cycling Reservoirs
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often memorize that aquatic ecosystems have an 'inverted pyramid of biomass' but fail to link this structural phenomenon to its functional requirement: a high turnover rate that is absolutely dependent on rapid mineralization.
The trap in Option A exploits the 'Not/Except' cognitive bias by using the word 'invert' alongside 'pyramid of energy', testing the fundamental NCERT rule that energy pyramids can never be inverted.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Ecosystem - Class 12 |
| Concept | Humification vs Mineralization |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |