Q67. In the case of one of the following biogeochemical cycles, the weathering of rocks is the main source of release of nutrients to enter the cycle?
a) Carbon cycle
b) Nitrogen cycle
c) Phosphorus cycle
d) Sulphur cycle
Answer: (c)
- Option c is correct: Carbon and Nitrogen cycles are the gaseous cycles. Here, the main reservoir of nutrients is the atmosphere or the hydrosphere. In the sulfur cycle, the nutrient is released by the weathering of rocks, erosional runoff and decomposition of organic matter. The sulphur cycle is mostly sedimentary but two of its compounds hydrogen sulfide (H2S) and sulphur dioxide (SO2) add a gaseous component to its normal sedimentary cycle.
- In the Phosphorus cycle, nutrients are released mainly by weathering of rocks since the Phosphorus mainly occurs as a mineral in phosphate rocks. It enters the cycle of erosion and mining activities
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