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UPSC 2011: Consider the following : 1. Photosynthesis 2. Respiration 3. Decay of organic matter 4. Volcanic action Which of the above add carbon dioxide to the carbon cycle on Earth ?
(a)1 and 4 only
(b)2 and 3 only
(c)2, 3 and 4 only
(d)1, 2, 3 and 4
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Not attemptedCorrect Answer: (c) 2, 3 and 4 only
Respiration of organisms (2), microbial decay of organic matter (3) and volcanic eruptions or degassing (4) all emit CO₂ to the atmosphere. Photosynthesis (1) instead removes CO₂ by fixing it into organic matter, so only statements 2, 3 and 4 add carbon dioxide. ([studyadda.com](https://www.studyadda.com/solved-papers/solved-paper-general-studies-2011_q69/771/355488?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2011 Environment & Ecology question?▼
The correct answer is option (c): 2, 3 and 4 only. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Biogeochemical Cycles & Earth Systems question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2011, GS Paper 1, as Question 48. It falls under Environment & Ecology > Biogeochemical Cycles & Earth Systems.
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 Biogeochemical Cycles & Earth Systems?▼
UPSC has asked 8 questions from Biogeochemical Cycles & Earth Systems (under Environment & Ecology) across multiple years. Visit the topic page to see the full list and year-wise trends.