Why is the filtering out of UV light by ozone crucial?

• A. It enhances atmospheric pressure
• B. It is crucial to life on earth
• C. It reduces the oxygen levels in the atmosphere
• D. It increases temperatures in the stratosphere

Answer: (B)

Filtering out ultraviolet (UV) light by ozone is crucial to life on Earth for several reasons. The ozone layer, located in the stratosphere, absorbs the majority of the sun's harmful UV radiation. Without this protective layer, increased levels of UV radiation would penetrate the atmosphere, leading to adverse effects on living organisms.

For instance, heightened UV exposure can cause skin cancer and cataracts in humans, harm various forms of wildlife, particularly those living in or near water bodies, and disrupt ecosystems. It can also negatively impact crops and marine life, which are sensitive to changes in UV levels. Thus, the ability of ozone to absorb and filter UV light plays a vital role in maintaining health and stability in biological systems, making it essential for supporting life on earth.