The ______ layer acts as an invisible shield and protects us from harmful ultraviolet (UV) radiation from the sun.

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Punjab Police Constable Previous year Paper (held On: 25 Sept 2021)
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  1. nitrogen
  2. argon
  3. ozone
  4. methane

Answer (Detailed Solution Below)

Option 3 : ozone
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The correct answer is Ozone.

Key Points

  • The ozone layer protects us from harmful ultraviolet rays of the sun.
  • The ozone layer is a region of high ozone concentration in the stratosphere, 15 to 35 kilometres above Earth's surface.
  • The ozone layer acts as an invisible shield and protects us from harmful ultraviolet (UV) radiation from the sun.

Additional InformationNitrogen:

  • It is one of the primary nutrients critical for the survival of all living organisms.
  • Nitrogen gas makes up 78% of our atmosphere and nitrogen is also a part of many molecules essential to life like proteins, nucleic acids (DNA and RNA) and some vitamins.
  • Nitrogen is found in other biologically important compounds such as alkaloids and urea too.
  • Nitrogen is thus an essential nutrient for all life-forms and life would be simple if all these life-forms could use the atmospheric nitrogen directly.
  • Although nitrogen is abundant in the atmosphere as Nitrogen gas (N2), it is largely inaccessible in this form to most organisms, making nitrogen a scarce resource and often limiting primary productivity in many ecosystems.

Argon:

  • Argon is the first noble gas to be discovered.
  • It belongs to noble gas and makes up about 0.93% of Earth’s atmosphere.
  • It is the third most abundant gas in the atmosphere.
  • Non-flammable cryogenics gases are sometimes referred to as inert gases.

Methane:

  • It is the simplest hydrocarbon, consisting of one carbon atom and four hydrogen atoms (CH4).
  • It is flammable, and is used as a fuel worldwide.
  • Methane is a powerful greenhouse gas.
  • Methane has more than 80 times the warming power of carbon dioxide over the first 20 years of its lifetime in the atmosphere.
  • The common sources of methane are oil and natural gas systems, agricultural activities, coal mining and wastes.
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