Ozone layer is present in

Options

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

Answer

### Step-by-Step Solution:

1. **Understanding the Layers of the Atmosphere**:
- The Earth's atmosphere is divided into several layers. The main layers, starting from the surface of the Earth, are:
- Troposphere
- Stratosphere
- Mesosphere
- Thermosphere

2. **Identifying the Location of the Ozone Layer**:
- The ozone layer is specifically located in the stratosphere. This layer lies above the troposphere and below the mesosphere.

3. **Function of the Ozone Layer**:
- The primary function of the ozone layer is to absorb the majority of the Sun's harmful ultraviolet (UV) radiation. This protection is crucial for life on Earth as excessive UV radiation can lead to skin cancer, cataracts, and other health issues, as well as negatively impacting ecosystems.

4. **Conclusion**:
- Therefore, the correct answer to the question "Ozone layer is present in" is the **stratosphere**.