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Question #45185
The Question
A farmer extensively cultivates Bt cotton expressing cryIAc and cryIIAb genes. While the target cotton bollworms (Lepidoptera) are successfully eradicated, the field experiences a massive outbreak of non-target sap-sucking insects (Hemiptera). Ecologically, this anthropogenic intervention alters interspecific competition. Which of the following statements regarding this scenario is INCORRECT?
Options
- A.
The outbreak of Hemipteran pests represents 'Competitive Release', as their realized niche expands upon the eradication of the dominant bollworms.
- B.
The Hemipteran insects survive because their midgut epithelial cells lack the specific receptors required for the activated Bt toxin to bind.
- C.
This dynamic illustrates MacArthur’s principle of resource partitioning, where the Hemipteran pests alter their foraging behavior to coexist with the transgenic crop.
- D.
The transgenic crop acts as an artificial selective pressure, altering the biological community structure without changing the fundamental niche of the Hemipteran pests.
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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
Cry gene|GEAC Oversight|Ecological Fitness
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students frequently confuse 'Competitive Release' (niche expansion due to competitor removal) with 'Resource Partitioning' (niche differentiation to enable coexistence).
The question also tests the integration of molecular biology (Cry protein receptor specificity from NCERT Class 12 Chapter 12) with population ecology (interspecific competition from Chapter 13), creating a high-yield synthesis trap.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Biotechnology and Its Applications - Class 12 |
| Concept | Cry Gene Specificity |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |