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?

Carbon cycle

Nitrogen cycle

Phosphorus cycle

Sulphur cycle

APEDIA

UPSC Prelims

2021 • 10 Oct, 2021 • Paper-1

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?

Correct Answer

Phosphorus cycle

Cycle Classifications: Biogeochemical cycles are broadly categorized into gaseous (where the atmosphere or ocean is the major reservoir, like carbon and nitroge......

💡 Analysis & Explanation

Cycle Classifications ▼

Biogeochemical cycles are broadly categorized into gaseous (where the atmosphere or ocean is the major reservoir, like carbon and nitrogen) and sedimentary cycles (where the earth's crust is the primary reservoir).

Phosphorus Dynamics ▼

The phosphorus cycle is a quintessential sedimentary cycle. Unlike carbon or nitrogen, phosphorus does not have a significant atmospheric gaseous phase. It is locked in mineral deposits and is introduced into terrestrial and aquatic ecosystems almost exclusively through the slow physical and chemical weathering of rocks.

Conclusion ▼

Weathering is the definitive and primary driver for the mobilization of phosphorus.

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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?