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

Options

A. Phosphorus cycle
B. Nitrogen cycle
C. Carbon cycle
D. Sulphur cycle

Explanation

To determine which of the following is not a gaseous biogeochemical cycle in the ecosystem, we need to analyze the provided options: phosphorus, nitrogen, carbon, and sulfur.

### Step-by-Step Solution:

1. **Understanding Biogeochemical Cycles**:
- Biogeochemical cycles are processes that recycle nutrients in various chemical forms from the environment to organisms and back to the environment. They can be classified into two main types: gaseous cycles and sedimentary cycles.

2. **Identifying Gaseous Cycles**:
- Gaseous biogeochemical cycles involve elements that exist in gaseous forms in the atmosphere. The most common gaseous cycles include:
- **Nitrogen Cycle**: Nitrogen is abundant in the atmosphere and cycles through various forms, including N2 gas.
- **Carbon Cycle**: Carbon exists in the atmosphere primarily as CO2 and is involved in various biological processes.

3. **Identifying Sedimentary Cycles**:
- Sedimentary biogeochemical cycles involve elements that are primarily found in solid form in the Earth's crust and do not have significant gaseous phases.
- **Phosphorus Cycle**: Phosphorus does not have a gaseous phase and primarily cycles through soil, water, and living organisms.
- **Sulfur Cycle**: Sulfur has both gaseous (e.g., sulfur dioxide) and sedimentary forms, but it is less prominent than nitrogen and carbon in the gaseous state.

4. **Analyzing the Options**:
- **Nitrogen**: Gaseous cycle.
- **Carbon**: Gaseous cycle.
- **Sulfur**: Has both gaseous and sedimentary forms, but is less significant as a gaseous cycle.
- **Phosphorus**: Predominantly a sedimentary cycle, with no significant gaseous phase.

5. **Conclusion**:
- Among the options provided, **phosphorus** is not a gaseous biogeochemical cycle. Therefore, the correct answer is **phosphorus**.

### Final Answer:
**Phosphorus cycle is not a gaseous biogeochemical cycle in the ecosystem.**