Before You Begin
Question #46698
The Question
During the metamorphosis of an insect, the structural reconfiguration of ommatidia for mosaic vision is governed by ecdysteroids. If a mutation deletes the Nuclear Localization Signal (NLS) of the intracellular ecdysone receptors in the developing eye discs, which of the following is the most likely physiological consequence?
Options
- A.
Structural 'mosaic-blindness' occurs because the hormone-receptor complex cannot interact with the genome to initiate the morphogenetic gene cascade, even if visual pigments are present.
- B.
Normal mosaic vision develops because ecdysteroids, being lipid-soluble, bypass the nucleus and directly activate secondary messengers like cAMP in the cytoplasm.
- C.
Ommatidial assembly completes successfully, but functional blindness occurs because the mutated receptor directly inhibits the cytoplasmic synthesis of visual pigments.
- D.
The insect develops superposition vision instead of apposition vision due to the compensatory activation of membrane-bound ecdysone receptors.
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
Ecdysone|Hormone Receptors Location|Metamorphosis
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: The question tests the student's ability to synthesize two distinct NCERT concepts: the structural basis of insect vision (ommatidia) and the molecular mechanism of steroid hormones (intracellular receptors acting as transcription factors).
The common misconception is confusing the action of lipid-soluble hormones (which require nuclear translocation to alter gene expression) with water-soluble hormones (which generate secondary messengers in the cytoplasm).
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 |