Before You Begin
Question #46684
The Question
An ecologist observes that the introduction of an alien plant species into a native ecosystem has drastically increased the total Net Primary Productivity (NPP) and vegetative biomass over a short period. Read the following statements regarding this scenario:
I. The invasive species artificially inflates short-term NPP, which can be misinterpreted as an enhancement of ecosystem services. II. The long-term functional diversity and trophic complexity of the ecosystem will increase due to the higher biomass available to primary consumers. III. The invasion represents a component of the 'Evil Quartet', leading to the competitive exclusion of native species and a decline in ecosystem resilience. IV. The overall valuation of ecosystem services (such as nutrient cycling and habitat provision) will ultimately decrease despite the initial surge in biomass.
Which of the above statements are correct?
Options
- A.
I, III, and IV only
- B.
I and II only
- C.
II, III, and IV only
- D.
I, II, III, and IV
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
Soil_Development|Humus|Mineralization_Rate|Primary_Succession
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often falsely equate 'High Net Primary Productivity (NPP) / Biomass' directly with 'High Ecosystem Health / Stability'.
The trap relies on the misconception that more plant biomass automatically benefits primary consumers.
In reality, invasive species disrupt food webs because they are usually unpalatable or toxic to native herbivores, leading to a collapse in trophic complexity despite the illusion of a highly productive ecosystem.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Ecosystem - Class 12 |
| Concept | Primary Succession Facilitation |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |