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Question #46610
The Question
During primary succession on a bare rock, pioneer lichens weather the substrate, facilitating the establishment of bryophytes. Later, an intermediate shrub stage establishes but secretes potent allelochemicals that prevent the germination of any tree seeds, permanently locking the area in a shrubland state. Regarding the biotic interactions and successional dynamics in this scenario, which of the following statements is INCORRECT?
Options
- A.
The initial transition from lichens to bryophytes is driven by a (+/0) interaction, where pioneers act as facilitators.
- B.
The allelopathic inhibition of tree seeds by the shrubs represents an amensalistic (-/0) or competitive interaction.
- C.
This arrested succession confirms that progression toward a mesic climax community is a strictly deterministic and inevitable process.
- D.
The failure to reach a forest climax occurs because the shrubs modified the environment to be less suitable for the subsequent seral stage.
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
Invasive Species|Niche Vacuum|Biodiversity Loss
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often harbor the misconception that ecological succession is a rigid, inevitable march toward a mesic forest climax.
This question forces the synthesis of two NCERT chapters ('Organisms and Populations' and 'Ecosystem') by mapping successional facilitation and inhibition directly onto the (+/0) and (-/0) biotic interaction matrices, highlighting that climax communities are conditional upon continuous positive niche modification.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Organisms and Populations - Class 12 |
| Concept | Biotic Interactions - Positive/Negative sign matrix |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |