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Question #46031
The Question
Read the following statements regarding ecological succession and the quantification of standing crop. Which of the following statements is INCORRECT?
Options
- A.
Both hydrarch and xerarch successions progress towards a mesic environment, culminating in a climax community that supports the maximum standing crop.
- B.
During the progression of seral stages, the ecosystem's total biomass continuously increases, but the Net Primary Productivity (NPP) eventually declines as the community reaches climax.
- C.
To sustain its maximum standing crop, the climax community maintains a Gross Production to Community Respiration (P/R) ratio significantly greater than 1.
- D.
The transition from pioneer to climax stages involves facilitation, where early species modify the substrate, increasing the ecosystem's capacity to support a larger standing crop.
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
Decomposition Rate Modifiers|Humification|Mineralization
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Differentiating between 'Standing Crop' (a static measure of accumulated biomass) and 'Productivity' (a rate).
Students often fall for the misconception that a climax forest, having the largest standing crop, must also have the highest net productivity and a P/R ratio > 1.
They fail to account for the massive respiratory burden of the climax biomass, which brings the P/R ratio down to 1, establishing the steady-state equilibrium.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Ecosystem - Class 12 |
| Concept | Standing Crop quantification |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |