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UPSC PYQPrelims 2021

Civil Services Examination · Question 27

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?

  1. Carbon cycle
  2. Nitrogen cycle
  3. Phosphorus cycle
  4. Sulphur cycle
Show answer & explanation

Answer: (C) Phosphorus cycle

Explanation

Phosphorus has a sedimentary cycle with no significant atmospheric reservoir; it enters ecosystems mainly through weathering of rocks.