Assertion. The temperature in the stratosphere increases with altitude
Reason. Ozone present absorbs the ultraviolet radiation.

Options

A. If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
B. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
C. If Assertion is true but Reason is false
D. If both Assertion and Reason are false

Answer

To analyze the given assertion and reason, we will break down the information step by step.

### Step 1: Understanding the Assertion
The assertion states that "the temperature in the stratosphere increases with altitude."

- In the stratosphere, which is the second layer of Earth's atmosphere, the temperature does indeed increase with altitude. This is contrary to the troposphere (the layer below the stratosphere), where temperature decreases with altitude.

### Step 2: Understanding the Reason
The reason states that "ozone present absorbs ultraviolet radiation."

- Ozone (O₃) is concentrated in the stratosphere and plays a crucial role in absorbing harmful ultraviolet (UV) radiation from the sun. This absorption of UV radiation is what causes the temperature in the stratosphere to rise with altitude.

### Step 3: Connecting Assertion and Reason
Now, we need to connect the assertion with the reason.

- The increase in temperature with altitude in the stratosphere is primarily due to the presence of ozone, which absorbs UV radiation. When ozone absorbs this radiation, it converts the energy into heat, thereby increasing the temperature of the stratosphere as altitude increases.

### Conclusion
Both the assertion and the reason are true, and the reason correctly explains the assertion. Therefore, we can conclude that:

- **Assertion**: True
- **Reason**: True
- **Explanation**: The reason is a correct explanation of the assertion.

### Final Answer
Both the assertion and the reason are true, and the reason correctly explains the assertion.

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