Before You Begin
Question #135613
The Question
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): In a terrestrial ecosystem, prolonged anaerobiosis due to waterlogging causes a significant decline in the net primary productivity (NPP). Reason (R): Anaerobiosis inhibits the process of mineralization, leading to nutrient immobilization where essential elements like nitrogen and phosphorus remain locked in the accumulated humus.
In the light of the above statements, choose the most appropriate answer from the options given below:
Options
- A.
Both (A) and (R) are correct and (R) is the correct explanation of (A)
- B.
Both (A) and (R) are correct but (R) is not the correct explanation of (A)
- C.
(A) is correct but (R) is not correct
- D.
(A) is not correct but (R) is correct
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
Inverted Biomass Pyramids|Rivet Popper Hypothesis|Diversity-Stability Relationship
Why This Question Is Tricky
Examiner Levers
Logical Assertion
Tests the causal relationship between two true statements.
Difficulty Boost : +4Common Mistakes
Conceptual Pivot: Students often memorize that 'moisture favors decomposition' but fail to distinguish between 'moist soil' (aerobic, favors decomposition) and 'waterlogged soil' (anaerobic, inhibits decomposition).
Furthermore, this question tests the ability to link a micro-level soil process (inhibition of mineralization/nutrient immobilization) to a macro-level ecosystem outcome (reduction in Net Primary Productivity).
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Ecosystem - Class 12 |
| Concept | Inverted Biomass Pyramids |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |