The biogeochemical cycle that is directly driven by sunlight is

Options

A. Nitrogen
B. Carbon
C. Phosphorus
D. All of these

Answer

To solve the question regarding which biogeochemical cycle is directly driven by sunlight, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Biogeochemical Cycles**:
- Biogeochemical cycles are natural pathways through which essential elements and compounds circulate in the ecosystem. They involve biological, geological, and chemical processes.

2. **Identifying the Options**:
- The options given are:
- A) Nitrogen
- B) Carbon
- C) Phosphorus
- D) All of these

3. **Analyzing Each Cycle**:
- **Nitrogen Cycle**: This cycle involves the conversion of nitrogen in the atmosphere into forms usable by living organisms. While it is crucial for life, it is not directly driven by sunlight.
- **Carbon Cycle**: This cycle involves the movement of carbon through the atmosphere, biosphere, hydrosphere, and lithosphere. Photosynthesis, which is driven by sunlight, plays a significant role in this cycle as plants convert carbon dioxide (CO2) into organic compounds.
- **Phosphorus Cycle**: This cycle does not involve atmospheric gases and is primarily driven by geological processes and biological uptake. It is not directly influenced by sunlight.

4. **Determining the Correct Answer**:
- Since photosynthesis (a key process in the carbon cycle) is directly driven by sunlight, we can conclude that the biogeochemical cycle that is directly driven by sunlight is the **Carbon Cycle**.

5. **Final Answer**:
- The correct answer is **B) Carbon**.