In which of the following zones of atmosphere ozone layer is present ?

Options

A. Troposphere
B. Stratosphere
C. Mesosphere
D. Exosphere

Answer

To determine in which zone of the atmosphere the ozone layer is present, we will analyze the different layers of the atmosphere and their characteristics.

### Step-by-Step Solution:

1. **Identify the Layers of the Atmosphere**:
- The atmosphere is divided into several layers: Troposphere, Stratosphere, Mesosphere, and Exosphere.

2. **Define Each Layer**:
- **Troposphere**: This is the lowest layer of the atmosphere, extending from the Earth's surface up to about 12 to 18 kilometers. It is where weather phenomena occur and where planes typically fly.
- **Stratosphere**: This layer extends from about 11 kilometers to 50 kilometers above the Earth's surface. It is known for containing the ozone layer, which absorbs and scatters ultraviolet solar radiation.
- **Mesosphere**: This layer ranges from approximately 40-50 kilometers to 80-90 kilometers. It is where meteors burn up upon entering the atmosphere.
- **Exosphere**: This is the outermost layer, extending from about 800 kilometers to 3000 kilometers above the Earth. It is where satellites and spaceships operate.

3. **Locate the Ozone Layer**:
- The ozone layer is primarily found in the **Stratosphere**. This layer plays a crucial role in protecting life on Earth by absorbing the majority of the sun's harmful ultraviolet (UV) radiation.

4. **Conclusion**:
- Therefore, the ozone layer is present in the **Stratosphere**.

### Final Answer:
The ozone layer is present in the **Stratosphere**.

---