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Question #46889
The Question
An experimental disruption of the hormonal balance during insect metamorphosis causes the cells of the Malpighian tubules to undergo dedifferentiation rather than functional maturation. Which of the following represents the immediate systemic consequence in the insect, and how does this cellular requirement contrast with the functional maturation of tracheary elements in plants?
Options
- A.
Accumulation of potassium urate in the hemolymph leading to metabolic toxicity; whereas plant tracheary elements must undergo terminal differentiation, losing their protoplasm to become functional.
- B.
Rapid hemolymph hypotonicity due to the inability to reabsorb water from the hindgut; whereas plant tracheary elements require dedifferentiation to form the vascular cambium.
- C.
Failure of uric acid synthesis in the hepatic caeca leading to fatal dehydration; whereas plant tracheary elements must redifferentiate to transport water and minerals.
- D.
Accumulation of ammonia in the hemocoel due to the loss of ureotelic excretion; whereas plant tracheary elements remain as living differentiated cells to provide mechanical support.
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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
Cockroach Excretory Malpighian Tubules|Cockroach Reproductive Dimorphism|Differentiation vs Dedifferentiation
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Understanding the strict functional requirement of 'Differentiation' across kingdoms.
Students often confuse the specific excretory product of insects (uricotelic vs ureotelic) and the exact anatomical role of Malpighian tubules vs Hepatic caeca.
Furthermore, it tests the NCERT concept that plant tracheary elements must be dead (terminally differentiated without protoplasm) to function, contrasting animal cellular plasticity with rigid plant developmental endpoints.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Structural Organisation in Animals - Class 11 |
| Concept | Cockroach Excretory Malpighian Tubules |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |