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GS Paper IUPSC Prelims 2013
Health & Medicine
Question No. 43Interactive Test Mode
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Q43. Consider the following minerals: 1. Calcium 2. Iron 3. Sodium Which of the minerals given above is/are required by the human body for the contraction of muscles?

Consider the following minerals:

  1. Calcium
  2. Iron
  3. Sodium Which of the minerals given above is/are required by the human body for the contraction of muscles?
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 2013 • Science and Technology

Correct Answer: Option (D) — 1, 2 and 3

Concept & Option Breakdown

Standard Reference Verified

Option 1 is correct: Calcium ions bind to troponin on actin filaments, facilitating the actin-myosin interaction necessary for muscle contraction. Option 2 is correct: Iron is a vital component of myoglobin and hemoglobin, facilitating oxygen storage and cellular energy production required for sustaining muscle contraction. Option 3 is correct: Sodium is essential for generating action potentials across neuromuscular junctions that trigger muscle fiber contraction.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2013 (Q43)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (D) — 1, 2 and 3

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Frequently Asked Questions — UPSC Prelims 2013 Q43

What is the official answer for UPSC Prelims 2013 GS Paper I Question 43 (Science and Technology)?

The official UPSC answer key for this 2013 Science and Technology (Health & Medicine) question is Option (D): "1, 2 and 3". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2013 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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