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GS Paper IUPSC Prelims 2002
Health & Medicine
Question No. 462Interactive Test Mode
00:00
+2-0.66

Q462. Which one of the following statements is correct?

Which one of the following statements is correct?

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 2002 • Science and Technology

Correct Answer: Option (C) — Viroids consist of single-stranded RNA molecule

Concept & Option Breakdown

Standard Reference Verified

Option (c) is correct: Viroids are sub-viral plant pathogens composed exclusively of short, circular, single-stranded RNA molecules without any protein coat. Option (a) is incorrect: Prions are misfolded protein particles without any nucleic acid or cellular structure. Option (b) is incorrect: Mycoplasma species naturally lack a cell wall entirely. Option (d) is incorrect: Rickettsiae are Gram-negative bacteria that do possess a peptidoglycan cell wall.

Elimination Heuristic & Exam Approach

Viroids differ from viruses because they consist solely of a single-stranded RNA loop lacking a protein capsid.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2002 (Q462)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (C) — Viroids consist of single-stranded RNA molecule

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Frequently Asked Questions — UPSC Prelims 2002 Q462

What is the official answer for UPSC Prelims 2002 GS Paper I Question 462 (Science and Technology)?

The official UPSC answer key for this 2002 Science and Technology (Health & Medicine) question is Option (C): "Viroids consist of single-stranded RNA molecule". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2002 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?

Viroids differ from viruses because they consist solely of a singlestranded RNA loop lacking a protein capsid.

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