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UPSC 2021: In case of which one of the following biogeochemical cycles, the weathering of rocks is the main source of release of nutrient to enter the cycle?
(a)Carbon cycle
(b)Nitrogen cycle
(c)Phosphorus cycle
(d)Sulphur cycle
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Not attemptedCorrect Answer: (c) Phosphorus cycle
The phosphorus cycle lacks a significant gaseous phase; phosphate locked in rocks is released mainly by weathering and leaching, making rock weathering the principal natural input of this nutrient. Carbon, nitrogen and sulphur cycles each have major atmospheric reservoirs instead. ([britannica.com](https://www.britannica.com/science/biosphere/The-cycling-of-phosphorus-and-other-essential-nutrients?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2021 Environment & Ecology question?▼
The correct answer is option (c): Phosphorus cycle. 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 2021, GS Paper 1, as Question 27. 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.