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Q89 (UPPCS/2025) Environment & Ecology › Pollution & Conservation

With reference to 'ozone layer', which of the following statements is/are correct ?
1. Ozone layer shields the surface of the earth from the ultra-violet radiations from the sun.
2. Ozone depletion has been linked to the chlorofluorocarbons.
Select the correct answer from the code given below :
Code :

Result
Your answer: —  Â·  Correct: D

Explanation

Both statements are correct:

  • Statement 1: The ozone layer, primarily located in the stratosphere, acts as a vital shield for the planet. It absorbs the majority (97-99%) of the sun's harmful ultraviolet (UV) radiation, particularly UV-B. Without this protection, increased UV levels would lead to higher rates of skin cancer, cataracts, and significant damage to terrestrial and marine ecosystems.
  • Statement 2: Extensive scientific research has linked the thinning of the ozone layer to chlorofluorocarbons (CFCs) and other ozone-depleting substances (ODS). When CFCs reach the stratosphere, UV radiation breaks them down, releasing chlorine atoms. These atoms act as catalysts, where a single chlorine atom can destroy thousands of ozone (O3) molecules. This global concern led to the adoption of the Montreal Protocol in 1987 to phase out these chemicals.
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SIMILAR QUESTIONS

CDS-II · 2011 · Q13 Relevance score: 4.52

Which of the following statements regarding ozone layer within the atmos- phere is/are correct ? 1. It absorbs most of the ultraviolet radiation found in the Sun’s rays. 2. Chlorofluorocarbons are serious threat to the ozone layer. Select the correct answer using the code given below :

CDS-I · 2012 · Q80 Relevance score: 3.35

Consider the following state- ments : 1. Ozone is mostly found in the stratosphere. 2. Ozone layer lies 55-75 km above the surface of the Earth. 3. Ozone absorbs ultraviolet radiation from the Sun. 4. Ozone layer has no significance for life on the Earth. Which of the statements given above are correct ?

CDS-II · 2020 · Q36 Relevance score: 2.17

Which one of the following statements with regard to ozone is NOT correct?

CGS · 2026 · Q17 Relevance score: 1.83

With reference to 'water vapour in the atmosphere', which of the following statements is/are correct?

I. It contributes to the stability and instability in the air.

II. It acts like a blanket, allowing the Earth neither to become too cold nor too hot.

Select the answer using the code given below.

CDS-I · 2006 · Q86 Relevance score: 1.63

Which one of the following statements is correct ? Ozone is found in the Earth’s atmosphere mostly between ,