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GS Paper IUPSC Prelims 2012
Health & Medicine
Question No. 199Interactive Test Mode
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+2-0.66

Q199. Which one of the following sets of elements was primarily responsible for the origin of life on the Earth?

Which one of the following sets of elements was primarily responsible for the origin of life on the Earth?

Select the correct option below (or cross out options to eliminate)
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Official Answer Key & Detailed Solution

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Official UPSC Answer KeyUPSC Prelims 2012 • Science and Technology

Correct Answer: Option (B) — Carbon, Hydrogen, Nitrogen

Concept & Option Breakdown

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The biochemical origin of life (chemical evolution / Oparin-Haldane hypothesis) required prebiotic synthesis of basic organic monomers (amino acids, purines, pyrimidines, and hydrocarbons) which are primarily polymers of Carbon, Hydrogen, and Nitrogen along with Oxygen (CHON). Among the given options, the triplet {Carbon, Hydrogen, Nitrogen} represents the foundational elemental triad of primordial prebiotic synthesis.

Elimination Heuristic & Exam Approach

Identify core organic elemental constituents of biomolecules: Carbon, Hydrogen, and Nitrogen form the backbone of all amino acids and nucleobases.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2012 (Q199)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (B) — Carbon, Hydrogen, Nitrogen

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Living organisms require at least 27 elements, of which 15 are metals. Among these, those required in major quantities, include:

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Frequently Asked Questions — UPSC Prelims 2012 Q199

What is the official answer for UPSC Prelims 2012 GS Paper I Question 199 (Science and Technology)?

The official UPSC answer key for this 2012 Science and Technology (Health & Medicine) question is Option (B): "Carbon, Hydrogen, Nitrogen". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2012 question belong to?

This question belongs to GS Paper I under the subject "Science and Technology" and micro-topic "Health & Medicine". You can explore all repeated questions from Health & Medicine in Acme AI's 3D Prelims PYQ Realm or practice 50 full-length and sectional tests in the APT Prelims Test Series.

How can I solve this Health & Medicine UPSC Prelims question using option elimination?

Identify core organic elemental constituents of biomolecules: Carbon, Hydrogen, and Nitrogen form the backbone of all amino acids and nucleobases.

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