Before You Begin
Question #46639
The Question
In an arid ecosystem, certain gastropods undergo aestivation to avoid summer-related desiccation. Following the first sudden monsoon showers, these organisms immediately emerge to forage. However, the expected surge in primary productivity they rely on is delayed, creating a temporary 'nutrient trap'. Based on the NCERT principles of nutrient cycling and decomposition, what is the primary reason for this delay?
Options
- A.
The preceding dry period inhibited microbial enzymatic activity, causing a kinetic lag in the mineralization of detritus into inorganic nutrients.
- B.
The sudden moisture fluctuation accelerates fragmentation but completely inhibits the leaching of water-soluble inorganic nutrients.
- C.
High temperatures during the dry period promoted rapid humification, locking nutrients in a highly degradable colloidal state.
- D.
The sudden influx of water causes immediate leaching of all accumulated raw detritus into the lower soil horizon, bypassing catabolism.
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Evolutionary_Exception
Tackle problems where standard rules evolve or change based on specific environmental constraints.
Concepts Behind This Question
Habitat Fragmentation|Minimum Viable Population|Genetic Bottlenecks
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Cross-linking 'Organisms and Populations' (Aestivation) with 'Ecosystem' (Decomposition rate modifiers).
The trap relies on the student's ability to recognize that biological reactivation is not synchronous across all trophic levels.
Students often fail to distinguish between the immediate behavioral response of macro-organisms (breaking dormancy) and the biochemical lag phase of micro-organisms (mineralization) which requires sustained threshold hydration.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Organisms and Populations - Class 12 |
| Concept | Population Density Estimation (Mark-Recapture) |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |