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GS Paper IUPSC Prelims 2002
Health & Medicine
Question No. 460Interactive Test Mode
00:00
+2-0.66

Q460. Which one of the following statements is not correct?

Which one of the following statements is not 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 (A) — All echinoderms are viviparous.

Concept & Option Breakdown

Standard Reference Verified

Option (a) is incorrect: Echinoderms (starfish, sea urchins, sea cucumbers) are predominantly oviparous and reproduce by broadcast spawning (external fertilization) in water; viviparity is extremely rare among them. Option (b) is correct: Nematodes (roundworms) lack a specialized circulatory system; pseudocoelomic fluid transports nutrients. Option (c) is correct: Osteichthyes (bony fishes) possess a swim/air bladder for buoyancy regulation. Option (d) is correct: Chondrichthyes (cartilaginous fishes like sharks and rays) utilize claspers for internal fertilization.

Elimination Heuristic & Exam Approach

The extreme categorical term 'ALL echinoderms are viviparous' is false, as nearly all marine invertebrates spawn eggs externally.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2002 (Q460)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (A) — All echinoderms are viviparous.

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Frequently Asked Questions — UPSC Prelims 2002 Q460

What is the official answer for UPSC Prelims 2002 GS Paper I Question 460 (Science and Technology)?

The official UPSC answer key for this 2002 Science and Technology (Health & Medicine) question is Option (A): "All echinoderms are viviparous.". 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?

The extreme categorical term 'ALL echinoderms are viviparous' is false, as nearly all marine invertebrates spawn eggs externally.

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