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Environmental Issues — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYEnvironmental Issues1 Mark
MCQ
$\text{CFC}$ are not recommended to be used in refrigerators because they :
  • A
    Increase temperature
  • ✓
    Deplete ozone
  • C
    Affect environment
  • D
    Affect human body
✓

Answer

Correct option: B.
Deplete ozone
Ozone depleting substances $\text{(ODS)}$ are substances, which react with ozone present in the stratosphere and destroy the same.
The major $\text{ODS}$ are chlorofluorocarbons $(14$ percent of total depletion$),$ nitrogen oxides $(3$ to $5$ percent of total depletion$),$ sulphur dioxides, halon, carbon tetrachloride, methane, methyl chloroform etc.

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