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UPSC 2013: Consider the following minerals: 1. Calcium 2. Iron 3. Sodium Which of the minerals given above is/are required by human body for the contraction of muscles?
(a)1 only
(b)2 and 3 only
(c)1 and 3 only
(d)1, 2 and 3
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Not attemptedCorrect Answer: (d) 1, 2 and 3
Calcium ions bind to troponin to start the actin–myosin cross-bridge cycle; sodium ions generate the depolarising action potential that releases the calcium; iron (as a component of myoglobin and of oxidative-phosphorylation enzymes) supplies the oxygen-linked energy needed for repeated contractions. Hence all three minerals are required, making option (d) correct. ([upscprep.com](https://www.upscprep.com/upsc-prelims-gs-2013-question-paper-and-answer-key/?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2013 Science & Technology question?▼
The correct answer is option (d): 1, 2 and 3. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Biology question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2013, GS Paper 1, as Question 50. It falls under Science & Technology > Biology.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
How many UPSC Prelims questions have been asked from Biology?▼
UPSC has asked 97 questions from Biology (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.