What is the primary function of the ozone layer?

• A. To protect life on Earth from harmful UV radiation
• B. To regulate Earth's temperature
• C. To provide oxygen for living organisms
• D. To filter out harmful gases from the atmosphere

Answer: (A)

The primary function of the ozone layer is to protect life on Earth from harmful ultraviolet (UV) radiation. Located in the stratosphere, the ozone layer absorbs a significant portion of the sun's harmful UV radiation, specifically UV-B and UV-C rays. This protective barrier is essential for maintaining life on Earth, as prolonged exposure to these high-energy rays can lead to serious health issues, such as skin cancer, cataracts, and other health-related problems, as well as detrimental effects on ecosystems, including reduced agricultural productivity and damage to marine life.

The other options pertain to different environmental functions that do not specifically describe the role of the ozone layer. For instance, although the atmosphere contributes to temperature regulation through the greenhouse effect, this function is more related to greenhouse gases rather than ozone itself. The provision of oxygen for living organisms is primarily the role of plants through photosynthesis, which is unrelated to the ozone layer's primary function. Similarly, while the atmosphere does filter out some harmful gases, this task involves various components of the atmosphere rather than being a specific role of the ozone layer.