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GS Paper IUPSC Prelims 2002
Health & Medicine
Question No. 454Interactive Test Mode
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+2-0.66

Q454. In the context of organic evolution, the loss of limbs in snakes is explained by the phenomenon of

In the context of organic evolution, the loss of limbs in snakes is explained by the phenomenon of

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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 (A) — use and disuse of organs

Concept & Option Breakdown

Standard Reference Verified

Jean-Baptiste Lamarck's evolutionary hypothesis proposed the 'Theory of Use and Disuse', positing that continuous disuse of an anatomical structure leads to its gradual reduction and eventual disappearance over generations, with snake limblessness cited as a classic example resulting from adaptation to subterranean/crevice movement.

Elimination Heuristic & Exam Approach

In classical evolutionary biology questions from early UPSC papers, the disappearance of snakes' limbs is specifically associated with Lamarck's principle of 'use and disuse'.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2002 (Q454)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (A) — use and disuse of organs

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Frequently Asked Questions — UPSC Prelims 2002 Q454

What is the official answer for UPSC Prelims 2002 GS Paper I Question 454 (Science and Technology)?

The official UPSC answer key for this 2002 Science and Technology (Health & Medicine) question is Option (A): "use and disuse of organs". 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?

In classical evolutionary biology questions from early UPSC papers, the disappearance of snakes' limbs is specifically associated with Lamarck's principle of 'use and disuse'.

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