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Question #46957
The Question
While studying Earth's evolutionary chronology, a student compares the formation of 'Diatomaceous earth' with the prebiotic synthesis demonstrated by the Miller-Urey experiment. Which of the following statements accurately contrasts these two phenomena?
Options
- A.
Diatomaceous earth formation is a biogenic process involving the accumulation of siliceous cell walls of Chrysophytes, whereas the Miller-Urey experiment models the abiotic formation of organic precursors in a reducing environment.
- B.
Diatomaceous earth provides fossil evidence of the first chemoautotrophic monerans, while the Miller-Urey experiment demonstrates the origin of these monerans from inorganic constituents.
- C.
Both phenomena provide direct evidence for chemical evolution, but diatomaceous earth formation occurred in an oxidizing atmosphere while the Miller-Urey synthesis required a reducing atmosphere.
- D.
The silica frustules of diatoms were synthesized abiotically under high temperatures (800°C) similar to the Miller-Urey conditions, before being incorporated into early eukaryotic cells.
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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
Chrysophytes Silica Wall|Standing Crop quantification|Ecosystem
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Distinguishing between geological deposits of biological origin (biogenesis/fossilization of eukaryotes) and the prebiotic chemical synthesis of organic molecules (abiogenesis).
Students often conflate 'billions of years' with 'prebiotic Earth', failing to realize that diatomaceous earth requires the pre-existence of advanced eukaryotic life, whereas Miller-Urey deals with the era before any life existed.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Biological Classification - Class 11 |
| Concept | Chrysophytes Silica Wall |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |