Phosphorus cycle is an example of sedimentary cycle.

Answer

**Step-by-Step Solution:**

1. **Understanding Biogeochemical Cycles**: Biogeochemical cycles are processes that involve the movement of elements and compounds through biological, geological, and chemical processes in the environment. These cycles can be categorized into two main types: sedimentary cycles and gaseous cycles.

2. **Defining Sedimentary and Gaseous Cycles**:
- **Sedimentary Cycle**: In this cycle, the main reservoirs are found in the earth's crust, particularly in rocks and sediments. Elements are primarily stored in solid forms and are released through weathering and erosion.
- **Gaseous Cycle**: In this cycle, the main reservoirs are found in the atmosphere. Elements are stored in gaseous forms and can easily move between the atmosphere and living organisms.

3. **Identifying the Phosphorus Cycle**: The phosphorus cycle is primarily a sedimentary cycle. The main reservoir of phosphorus is found in rocks and sediments. Phosphorus is released into the soil and water through the weathering of these rocks.

4. **Conclusion**: Since the phosphorus cycle involves the movement of phosphorus from rocks (sedimentary reservoir) to living organisms and back to the earth, it is indeed classified as a sedimentary cycle. Therefore, the statement "Phosphorus cycle is an example of sedimentary cycle" is true.

**Final Answer**: True, the phosphorus cycle is an example of a sedimentary cycle.

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