Biochemical cycle with gaseous phase is

Options

A. Carbon
B. Sodium
C. Phosphorus
D. Magnesium

Explanation

To answer the question "Biochemical cycle with gaseous phase is," we need to identify which of the given options represents a biogeochemical cycle that includes a gaseous phase. Here’s a step-by-step solution:

### Step 1: Understand Biogeochemical Cycles
Biogeochemical cycles are processes that recycle nutrients in various chemical forms from the environment to organisms and then back to the environment. These cycles can be classified based on the phases they involve.

**Hint:** Look for cycles that involve gases or vapors in their processes.

### Step 2: Identify Gaseous Phases
Some biogeochemical cycles involve a gaseous phase, meaning that one or more of the elements involved can exist in the atmosphere as a gas. Common examples include:
- Nitrogen Cycle
- Carbon Cycle
- Oxygen Cycle
- Hydrogen Cycle

**Hint:** Think about the elements that can be found in the atmosphere.

### Step 3: Analyze the Options
The options provided are:
- A) Carbon
- B) Sodium
- C) Phosphorus
- D) Magnesium

Among these, we need to identify which one is associated with a gaseous phase.

**Hint:** Recall which of these elements are known to cycle through the atmosphere.

### Step 4: Determine the Correct Answer
- **Carbon Cycle**: Involves carbon dioxide (CO2) in the atmosphere.
- **Nitrogen Cycle**: Involves nitrogen gas (N2) in the atmosphere.
- **Oxygen Cycle**: Involves oxygen gas (O2) in the atmosphere.
- **Hydrogen Cycle**: Involves water vapor (H2O) in the atmosphere.

Sodium, phosphorus, and magnesium do not have a gaseous phase in their biogeochemical cycles.

**Hint:** Focus on the cycles that involve gases like CO2, N2, and O2.

### Conclusion
The biogeochemical cycle with a gaseous phase from the options provided is **A) Carbon**.

**Final Answer:** A) Carbon