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UPSC 2012: Which one of the following sets of elements was primarily responsible for the origin of life on the Earth?
(a)Hydrogen, Oxygen, Sodium
(b)Carbon, Hydrogen, Nitrogen
(c)Oxygen, Calcium, Phosphorus
(d)Carbon, Hydrogen, Potassium
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Not attemptedCorrect Answer: (b) Carbon, Hydrogen, Nitrogen
The origin of life on Earth is attributed primarily to the elements Carbon, Hydrogen, and Nitrogen, along with Oxygen. Carbon is the backbone of all organic molecules due to its ability to form four covalent bonds. Hydrogen is the most abundant element in the universe and a key component of water and organic compounds. Nitrogen is essential for amino acids and nucleic acids (DNA/RNA). These elements combined to form the first organic molecules in the primordial soup. Hence, option (b) is correct.
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Frequently Asked Questions
What is the correct answer to this UPSC 2012 Science & Technology question?▼
The correct answer is option (b): Carbon, Hydrogen, Nitrogen. 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 2012, GS Paper 1, as Question 63. It falls under Science & Technology > Biology.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
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.