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Question #46153
The Question
Terrestrial insects utilize a highly branched tracheal system for gaseous exchange, delivering oxygen directly to cellular sites. Suppose a prolonged, significant decrease in atmospheric oxygen concentration occurs in a stable forest ecosystem. Integrating respiratory physiology with population growth models, which of the following consequences is NOT expected?
Options
- A.
The carrying capacity (K) for large-bodied insect populations will decrease because the diffusion distance exceeds the effective range for adequate metabolic flux.
- B.
The hemolymph will upregulate the synthesis of respiratory pigments to compensate for the reduced oxygen diffusion gradient.
- C.
The population growth rate (dN/dt) of large insects will become negative as environmental resistance sharply increases.
- D.
The community structure will undergo directional selection favoring smaller arthropods due to their more favorable surface-area-to-volume ratio.
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
Tracheal_Spiracles|Metabolic_Flux|Density_Dependent_Regulation
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot & Functional Overlap: Students often conflate general animal adaptations to hypoxia (e.g., vertebrates increasing RBCs or mollusks upregulating hemocyanin) with insect physiology.
The trap relies on forgetting the strict NCERT fact that the insect circulatory system is open and does NOT transport respiratory gases.
The question successfully integrates structural anatomy (tracheae) with population ecology (carrying capacity and logistic growth) to test deep conceptual synthesis.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Animal Kingdom - Class 11 |
| Concept | Arthropoda Respiratory Diversity |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |