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Question #47654
The Question
A forest soil ecosystem is dominated by detritus rich in lignin and chitin. Due to severe anthropogenic stress, the soil microbiome loses several key fungal and bacterial species, analogous to the 'loss of rivets on an airplane wing' (Rivet Popper Hypothesis). Which of the following represents the most scientifically accurate consequence regarding decomposition kinetics and cellular respiration in this altered ecosystem?
Options
- A.
The decomposition rate will increase due to reduced interspecific microbial competition, while the oxidation of the remaining detritus will exhibit an RQ value greater than 1.0.
- B.
Detritus will rapidly mineralize without undergoing humification, and the primary decomposers will utilize substrates with an RQ value of exactly 1.0.
- C.
Substrate accumulation will occur due to the loss of specific enzymatic pathways, and the aerobic oxidation of these complex substrates will yield a Respiratory Quotient (RQ) of less than 1.0.
- D.
The rate of decomposition will remain constant because climatic factors override chemical composition, while the RQ value will shift to 0.9 due to exclusive lipid degradation.
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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
Respiratory Quotient (RQ) Constants|Decomposition Rate Modifiers|Diversity-Stability Relationship
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Integrating Ecosystem Ecology (Decomposition factors & Rivet Popper Hypothesis) with Plant Physiology (Respiratory Quotient).
The trap relies on students failing to recognize that complex structural polymers like lignin and chitin behave metabolically more like fats/proteins (RQ < 1) rather than simple sugars (RQ = 1), and that microbial diversity is directly tied to functional enzymatic redundancy.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Respiration in Plants - Class 11 |
| Concept | Respiratory Quotient (RQ) Constants |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |