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Phosphorus cycle and rock weathering – UPSC Prelims PYQ 2021Jeevan Bisht2021 / Biogeochemical Cycling / Environment / UPSC Prelims PYQs
Agricultural soils — organic matter, sulphur cycle, salinization UPSC Prelims PYQ 2018Jeevan Bisht2018 / Biogeochemical Cycling / Environment / Geography / Geomorphology / Physical Geography / UPSC Prelims PYQs
Sources that add nitrogen to soil — UPSC Prelims PYQ 2013Jeevan Bisht2013 / Biogeochemical Cycling / Environment / UPSC Prelims PYQs
UPSC Prelims PYQ 2011: Which processes add CO2 to the carbon cycle?PMF IAS2011 / Biogeochemical Cycling / Environment / UPSC Prelims PYQs
