Before You Begin
Question #46577
The Question
Prolonged waterlogging in an agricultural field alters the soil microenvironment, directly impacting the detritus food chain. According to the principles of decomposition, which of the following phenomena is NOT expected to occur in such waterlogged soils?
Options
- A.
The rate of catabolism by saprophytic fungi and aerobic bacteria is significantly retarded.
- B.
The soil experiences a rapid increase in the rate of mineralization, releasing abundant inorganic nutrients.
- C.
The decomposition process shifts, leading to the accumulation of partially decomposed organic matter and organic acids.
- D.
The prevailing anaerobiosis lowers the redox potential, favoring facultative and obligate anaerobic microbes.
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
Humification vs Mineralization|BOD (Biochemical Oxygen Demand) Logic
Why This Question Is Tricky
Common Mistakes
The 'Conceptual Pivot' lies in distinguishing between 'moist' and 'waterlogged' conditions.
NCERT states that a 'warm and moist environment favors decomposition', leading students to falsely assume that excess water (waterlogging) accelerates hydrolytic breakdown.
However, waterlogging induces anaerobiosis, which acts as a severe limiting factor, halting mineralization and shifting the microbial kinetic pathway toward incomplete humification.
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 |