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Question #45805
The Question
A mammalian lineage undergoes strong directional selection for endurance locomotion, leading to the evolutionary vestigialization of explosive, high-intensity muscular traits. Based on the principle of 'form follows function', which of the following statements regarding the primary locomotor muscles of this adapted species is INCORRECT?
Options
- A.
They exhibit a high concentration of myoglobin and numerous mitochondria to support sustained aerobic respiration.
- B.
The sarcoplasmic reticulum is highly extensive to facilitate rapid and repeated calcium release for prolonged contractions.
- C.
They possess a high resistance to fatigue due to the minimal accumulation of lactic acid during continuous activity.
- D.
The evolutionary conservation of these fibers is driven by the metabolic efficiency of oxidative phosphorylation.
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Evolutionary_Exception
Tackle problems where standard rules evolve or change based on specific environmental constraints.
Concepts Behind This Question
Homologous_Structures|Selection_Pressure|Myoglobin_Content
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often assume that 'endurance' requires an 'extensive' sarcoplasmic reticulum to manage repeated contractions.
However, this is a functional trap.
NCERT explicitly distinguishes that white (fast-twitch/explosive) fibers have a high amount of SR for rapid calcium flooding, while red (slow-twitch/endurance) fibers have less SR, relying instead on high mitochondrial density and myoglobin for sustained, fatigue-resistant ATP production.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Locomotion and Movement - Class 11 |
| Concept | Muscle Fatigue Factors |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |