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Environmental Issues — BIOLOGY STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceBIOLOGYEnvironmental Issues1 Mark
MCQ
Ozone layer is disturbed by:
  • A
    Large number of factories
  • ✓
    Supersonic jets
  • C
    Large number of automobiles
  • D
    None of these
✓

Answer

Correct option: B.
Supersonic jets
Ozone is a form of a blanket covering the upper atmosphere which protects the earth from harmful ultraviolet rays.
Because of ozone depletion, these rays can now reach the earth through hole which was previously protected by ozone blanket.
The various causes of ozone depletion are as follows:
Huge combustion of fossil fuel and organic matter.
Excessive use of nitrogenous fertilizers.
Supersonic rockets and space shutters.
Nuclear test.
Excessive use of chlorofluorocarbons.
So, the correct answer is option $B.$

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