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

Options

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

Answer

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

### Step-by-Step Solution:

1. **Identify the Biogeochemical Cycles**:
- The cycles we are considering are:
- Sulfur Cycle
- Nitrogen Cycle
- Carbon Cycle
- Phosphorus Cycle

2. **Analyze Each Cycle**:
- **Sulfur Cycle**: Sulfur exists in the atmosphere primarily as sulfur dioxide (SO₂), which is a gas. Therefore, the sulfur cycle is a gaseous biogeochemical cycle.
- **Nitrogen Cycle**: Nitrogen is found in the atmosphere as nitrogen gas (N₂) and nitrogen oxides (NOx). This means the nitrogen cycle is also a gaseous biogeochemical cycle.
- **Carbon Cycle**: Carbon is present in the atmosphere as carbon dioxide (CO₂), which is a gas. Thus, the carbon cycle is classified as a gaseous biogeochemical cycle.
- **Phosphorus Cycle**: Phosphorus primarily exists in the soil and rocks and does not have a significant gaseous phase. It is released from rocks into the soil and taken up by plants, making it a non-gaseous biogeochemical cycle.

3. **Conclusion**:
- Among the cycles analyzed, the phosphorus cycle does not involve a gaseous phase. Therefore, it is the correct answer to the question.

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

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