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 solve the question "Which one of the following is not a gaseous biogeochemical cycle in the ecosystem?", we need to analyze the options provided: phosphorus, nitrogen, carbon, and sulfur cycles.

### Step-by-Step Solution:

1. **Understanding Biogeochemical Cycles**:
- Biogeochemical cycles refer to the movement of nutrients through different components of the ecosystem, including living organisms (bio), the earth (geo), and the atmosphere (chemical).
- These cycles can be classified into two main types: gaseous cycles and sedimentary cycles.

2. **Identifying Gaseous and Sedimentary Cycles**:
- **Gaseous Cycles**: These cycles have their reservoirs in the atmosphere and are more rapid. Examples include the nitrogen cycle, carbon cycle, and oxygen cycle.
- **Sedimentary Cycles**: These cycles have their reservoirs in the earth's crust and are generally slower. Examples include the phosphorus cycle and calcium cycle.

3. **Analyzing the Options**:
- **Phosphorus Cycle**: This is primarily a sedimentary cycle, as phosphorus is found in rocks and soil, and it does not have a significant gaseous phase.
- **Nitrogen Cycle**: This is a gaseous cycle, as nitrogen is abundant in the atmosphere and moves through various forms (N2, NH3, NO3-).
- **Carbon Cycle**: This is also a gaseous cycle, as carbon exists in the atmosphere as CO2 and is exchanged between living organisms and the environment.
- **Sulfur Cycle**: This cycle can be both gaseous and sedimentary, as sulfur can exist in the atmosphere (as SO2) and also in sedimentary forms.

4. **Conclusion**:
- Based on the analysis, the phosphorus cycle is not a gaseous biogeochemical cycle. Therefore, the correct answer is **phosphorus cycle**.

### Final Answer:
The phosphorus cycle is not a gaseous biogeochemical cycle in the ecosystem.