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Question #45174
The Question
The Genetic Engineering Appraisal Committee (GEAC) regulates the commercialization of GM crops in India. In the context of Bt cotton cultivation, which of the following statements is INCORRECT regarding the mechanism of action of Cry proteins and pest resistance management?
Options
- A.
The inactive protoxin is converted into an active form due to the alkaline pH of the insect gut, which solubilizes the protein crystals.
- B.
Activated Cry toxin binds to the surface of midgut epithelial cells, creating pores that cause cell swelling and eventual lysis.
- C.
GEAC mandates the planting of non-Bt 'refuge' crops alongside Bt crops to maximize directional selection pressure, ensuring complete eradication of the target pest.
- D.
Cultivating Bt cotton without refuge zones increases the frequency of resistance alleles in the pest population due to intense selection pressure.
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
Molecular Diagnosis by ELISA|GEAC Oversight|Antigen-Antibody Reaction
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often misunderstand the ecological purpose of 'refuge' crops, assuming all agricultural strategies aim for 'complete eradication' (maximizing selection pressure).
In reality, resistance management relies on maintaining a susceptible population to prevent the rapid evolution of resistance, bridging Biotechnology with Evolutionary Biology.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Biotechnology and Its Applications - Class 12 |
| Concept | GEAC Oversight |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |