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Question #46697
The Question
If an experimental neurotoxin selectively blocks the voltage-gated sodium channels at the Nodes of Ranvier in the axonal projections leading from the ommatidia to the optic lobe of an insect, which of the following represents the most accurate physiological consequence?
Options
- A.
The rhabdomes will fail to absorb light, preventing the generation of graded receptor potentials within the ommatidia.
- B.
The brain will fail to integrate the spatial mosaic into a unified image due to the loss of temporal synchrony of action potentials.
- C.
The visual processing will automatically shift from low-resolution mosaic vision to high-resolution apposition vision.
- D.
The ommatidia will continue to transmit signals via continuous conduction, thereby increasing the overall sensitivity of nocturnal vision.
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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
Ommatidium|Saltatory Conduction Nodes|Action Potential
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: This question tests the synthesis of two distinct NCERT concepts: the structural basis of 'Mosaic Vision' (Structural Organisation in Animals) and the mechanism of 'Saltatory Conduction' (Neural Control and Coordination).
The common misconception is confusing the generation of a sensory stimulus at the receptor level (ommatidia/rhabdome) with the propagation and temporal integration of that signal at the axonal/CNS level.
Students must recognize that mosaic vision relies heavily on the synchronized arrival of thousands of parallel inputs.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Structural Organisation in Animals - Class 11 |
| Concept | Mosaic Vision Processing |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |