The reservoir for the gaseous type of bio-geo chemical cycle exists in:

Options

A. stratosphere
B. atmosphere
C. ionosphere
D. lithosphere

Answer

To solve the question regarding the reservoir for the gaseous type of biogeochemical cycle, we can follow these steps:

### Step-by-Step Solution:

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. They can be classified into two main types: gaseous cycles and sedimentary cycles.

2. **Identify the Types of Cycles**:
- Gaseous cycles include the nitrogen cycle, water cycle, and oxygen cycle. These cycles have their reservoirs primarily in the atmosphere.
- Sedimentary cycles include the sulfur cycle and phosphorus cycle, where the reservoirs are found in the lithosphere (earth's crust).

3. **Determine the Reservoir for Gaseous Cycles**:
- In gaseous cycles, the main reservoir for the elements involved is the atmosphere. This is where gases like nitrogen, oxygen, and carbon dioxide are stored and exchanged.

4. **Analyze the Options Provided**:
- The options given are:
- A) Stratosphere
- B) Atmosphere
- C) Ionosphere
- D) Lithosphere
- Among these options, the atmosphere is the correct choice as it is the primary reservoir for gaseous biogeochemical cycles.

5. **Conclude the Answer**:
- Therefore, the reservoir for the gaseous type of biogeochemical cycle exists in the atmosphere.

### Final Answer:
The reservoir for the gaseous type of biogeochemical cycle exists in the **atmosphere**.

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