MCQ
The factor responsible for depletion of ozone layer is:
- AExcessive use of automobiles.
- BExcessive industrial units.
- ✓Excessive use of man made compounds containing chlorine and fluorine.
- DExcessive deforestation.
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Reason : Presence of insert results in inactivation of enzyme $\beta -$ galactosidase known as insertional inactivation.