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MDCAT Biology QUESTION #11286
Question 1
The ozone layer in the stratosphere protects life on Earth by absorbing:
  • Infrared radiation
  • Visible light
  • Ultraviolet (UV) radiation✔️
  • X-rays
Correct Answer Explanation
The ozone layer (O$_3$) absorbs approximately 97-99% of the sun's harmful ultraviolet-B (UV-B) and ultraviolet-C (UV-C) radiation. Depletion of the ozone layer (by CFCs) increases UV exposure, leading to higher rates of skin cancer and cataracts.