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Which one of the following is not a gaseous biogeochemical cycle in ecosystem?

1. Sulphur cycle
2. Phosphorus cycle
3. Nitrogen cycle
4. Carbon cycle

Correct answer: Phosphorus cycle

Solution

The phosphorus cycle is not gaseous because phosphorus has no significant atmospheric phase; it mainly circulates through rocks, soil, water, and organisms. In contrast, sulfur, nitrogen, and carbon all have important gaseous forms in the atmosphere.

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