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Which are the correct statements related to ozone?

(a) Ozone layer helps in increasing the UV radiations reaching earth.

(b) Ozone is a deadly poison.

(c) Ozone layer shields the earth from UV radiations.

(d) Ozone layer prevents UV rays which cause skin cancer.

(e) Ozone is formed with the help of Chloroflurocarbons.

options

  1. (a), (b), (c)
  2. (b), (c), (d)
  3. (c), (d), (e)
  4. (a), (d), (e)

Environment

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Answer

(b), (c), (d)

Reason — Ozone (O3) is a gas present in the stratosphere, where it forms the ozone layer that protects life on Earth.

  • Statement (a) is false because ozone layer reduces, not increases, UV radiation reaching Earth.
  • Statement (b) is true because, at the ground level, ozone is harmful and toxic to living organisms when inhaled.
  • Statement (c) is true as the ozone layer absorbs most of the harmful ultraviolet (UV) rays from the Sun.
  • Statement (d) is also true because by blocking UV rays, the ozone layer protects living beings from skin cancer, cataracts, and DNA damage.
  • Statement (e) is false because ozone is not formed by chlorofluorocarbons (CFCs); in fact, CFCs destroy ozone molecules.

Hence, the correct combination of statements is (b), (c), and (d).

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