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

Options

A. Water 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 each option provided:

1. **Water Cycle**: This cycle involves the continuous movement of water in various forms (liquid, vapor, ice) through the atmosphere, land, and bodies of water. It is considered a gaseous cycle because water vapor is a significant component of the atmosphere.

2. **Phosphorus Cycle**: This cycle describes the movement of phosphorus through the lithosphere, hydrosphere, and biosphere. Unlike the other cycles, phosphorus does not have a gaseous phase; it primarily exists in solid forms such as rocks and minerals. Therefore, it is not considered a gaseous biogeochemical cycle.

3. **Nitrogen Cycle**: This cycle involves the transformation of nitrogen in various forms (gas, ammonia, nitrate) and includes processes such as nitrogen fixation and denitrification. Nitrogen gas (N2) is a major component of the atmosphere, making this a gaseous cycle.

4. **Carbon Cycle**: This cycle describes the movement of carbon in various forms (carbon dioxide, organic matter) through the atmosphere, biosphere, and geosphere. Carbon dioxide is a gas, which qualifies this cycle as a gaseous biogeochemical cycle.

After analyzing all the options, we can conclude that the **Phosphorus Cycle** is the only one that is not a gaseous biogeochemical cycle.

**Final Answer**: The phosphorus cycle is not a gaseous biogeochemical cycle.

---