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Question #46976
The Question
Read the following statements regarding the structural architecture and evolutionary chronology of eukaryotic locomotory structures. Which of the following statements is INCORRECT?
Options
- A.
The axoneme of both protozoan cilia and human spermatozoan flagella exhibits a highly conserved 9+2 array of microtubules.
- B.
The basal body, which serves as the anchoring site for eukaryotic flagella, shares a 9+0 microtubular triplet organization with centrioles.
- C.
Eukaryotic cilia and flagella are extensions of the plasma membrane, whereas prokaryotic flagella are structurally distinct and lack the 9+2 axoneme.
- D.
During the evolutionary transition to siphonogamy in angiosperms, the 9+2 flagellar apparatus was modified into the pollen tube to facilitate male gamete transport.
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
Pseudopodia|Actin_Filaments|Myosin_ATPase
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often confuse functional analogs with structural homologs.
Because the pollen tube 'transports' the male gamete, a student might falsely assume it is an evolutionary modification of the ancestral flagellum.
The synthesis requires connecting NCERT Cell Biology (9+2 axoneme structure) with Plant Reproduction (angiosperm male gametes are strictly non-motile and lack flagella entirely).
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Biological Classification - Class 11 |
| Concept | Protozoan Locomotory Organs |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |