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GS Paper IUPSC Prelims 2009
Health & Medicine
Question No. 411Interactive Test Mode
00:00
+2-0.66

Q411. With reference to the evolution of living organisms, which one of the following sequences is correct?

With reference to the evolution of living organisms, which one of the following sequences 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 2009 • Science and Technology

Correct Answer: Option (C) — Salamander-Python-Kangaroo

Concept & Option Breakdown

Standard Reference Verified

The correct vertebrate evolutionary sequence is:

  1. Amphibians (e.g., Salamander) — evolved from ancestral lobe-finned fishes.
  2. Reptiles (e.g., Python) — evolved from ancestral amphibians with terrestrial adaptations (amniotic egg).
  3. Mammals (e.g., Kangaroo) — synapsid lineage evolving later from ancestral reptilian stock.

Evaluation of other sequences:

  • (a) Octopus (Mollusc) -> Dolphin (Mammal) -> Shark (Chondrichthyes fish) is out of chronological order.
  • (b) Pangolin (Mammal) -> Tortoise (Reptile) -> Hawk (Bird) is reversed.
  • (d) Frog (Amphibian/Vertebrate) -> Crab (Arthropod) -> Prawn (Arthropod) is reversed.
Elimination Heuristic & Exam Approach

Evolutionary progression in vertebrates follows: Fish -> Amphibians (Salamander) -> Reptiles (Python) -> Birds/Mammals (Kangaroo).

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2009 (Q411)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (C) — Salamander-Python-Kangaroo

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Frequently Asked Questions — UPSC Prelims 2009 Q411

What is the official answer for UPSC Prelims 2009 GS Paper I Question 411 (Science and Technology)?

The official UPSC answer key for this 2009 Science and Technology (Health & Medicine) question is Option (C): "Salamander-Python-Kangaroo". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2009 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?

Evolutionary progression in vertebrates follows: Fish > Amphibians (Salamander) > Reptiles (Python) > Birds/Mammals (Kangaroo).

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