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GS Paper IUPSC Prelims 1997
Health & Medicine
Question No. 509Interactive Test Mode
00:00
+2-0.66

Q509. Antigen is a substance which:

Antigen is a substance which:

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 1997 • Science and Technology

Correct Answer: Option (C) — triggers the immune system

Concept & Option Breakdown

Standard Reference Verified

An antigen is any foreign substance (such as a toxin or surface protein on pathogens) that induces an immune response in the body, stimulating the production of antibodies and the activation of lymphocytes.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 1997 (Q509)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (C) — triggers the immune system

Related & Repeated Prelims PYQs (1)

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2001 • Q47495% Match

Antigen is a substance which:

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Frequently Asked Questions — UPSC Prelims 1997 Q509

What is the official answer for UPSC Prelims 1997 GS Paper I Question 509 (Science and Technology)?

The official UPSC answer key for this 1997 Science and Technology (Health & Medicine) question is Option (C): "triggers the immune system". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 1997 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?

To solve Health & Medicine questions in UPSC Prelims, identify extreme modifiers, verify core NCERT conceptual definitions, and eliminate mutually contradictory statement pairs before locking your final option.

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