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Question #46873
The Question
An earthworm (Pheretima) is experimentally exposed to an environment with a high concentration of Carbon Monoxide (CO). Considering its circulatory and respiratory physiology, which of the following statements regarding the physiological consequences is INCORRECT?
Options
- A.
CO binds with high affinity to the respiratory pigment dissolved directly in the blood plasma, causing severe systemic hypoxia.
- B.
The blood glands situated in the 4th, 5th, and 6th segments will upregulate the production of erythrocytes to compensate for the hypoxic stress.
- C.
The ultimate cellular consequence of this exposure functionally mimics the inhibition of Complex IV (Cytochrome c oxidase) in the electron transport system.
- D.
Despite the closed circulatory system maintaining adequate hydrostatic pressure for fluid transport, it fails to deliver sufficient oxygen to the tissues.
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Comparative_Analysis
Sharpen your ability to evaluate multiple scenarios and distinguish between competing potential answers.
Concepts Behind This Question
Earthworm Circulatory Closed System|ETS Complex Specificity|Respiration
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students reflexively associate 'haemoglobin' and 'hypoxia compensation' with the production of RBCs (erythropoiesis) as seen in vertebrates.
The trap exploits the failure to recall the specific NCERT detail that earthworm blood cells are purely phagocytic and their haemoglobin is extracellular (dissolved in plasma).
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Structural Organisation in Animals - Class 11 |
| Concept | Earthworm Circulatory Closed System |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |