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Which of the following protects life on ...

Which of the following protects life on earth from harmful effects of UV radiations from sun?

A

`N_(2)`

B

`CO_(2)`

C

`O_(2)`

D

`O_(3)`

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question "Which of the following protects life on earth from harmful effects of UV radiations from the sun?", we can follow these steps: ### Step 1: Understand the Role of UV Radiation Ultraviolet (UV) radiation from the sun can be harmful to living organisms. It can cause skin cancer, cataracts, and other health issues, as well as negatively affect ecosystems. **Hint:** Consider the sources of UV radiation and their potential effects on living organisms. ### Step 2: Identify the Protective Mechanism The atmosphere contains certain gases that can absorb or reflect UV radiation. One of the most important components in this protective mechanism is ozone (O3). **Hint:** Think about the layers of the atmosphere and which gases are known to absorb UV radiation. ### Step 3: Learn About Ozone Formation Ozone is formed when ultraviolet light interacts with oxygen (O2) in the atmosphere. UV radiation breaks down O2 molecules into individual oxygen atoms, which can then react with other O2 molecules to form ozone (O3). **Hint:** Recall the chemical reactions involving oxygen and how they lead to the formation of ozone. ### Step 4: Locate the Ozone Layer The ozone layer is located in the stratosphere, approximately 15 to 20 kilometers above the Earth's surface. This layer is crucial for absorbing the majority of the sun's harmful UV radiation. **Hint:** Consider the different layers of the atmosphere and their respective functions. ### Step 5: Conclude the Answer Given that ozone (O3) is the component that protects life on Earth from harmful UV radiation, the correct answer to the question is ozone. **Final Answer:** The answer is O3 (ozone). ### Summary of Steps: 1. Understand the harmful effects of UV radiation. 2. Identify ozone as the protective mechanism. 3. Learn about the formation of ozone from oxygen. 4. Locate the ozone layer in the stratosphere. 5. Conclude that ozone protects life from UV radiation.
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