NEET2007BotanyEnvironmental IssuesActual
Assertion : Chlorofluorocarbons are responsible for ozone depletion. Reason : Ozone level decreases by as much as (67 % ) every year.
Options
- AIf both assertion and reason are true and reason is the correct explanation of assertion
- BIf both assertion and reason are true but reason is not the correct explanation of assertion
- CIf assertion is true but reason is false
- DIf both assertion and reason are false.
Correct answer
B. If both assertion and reason are true but reason is not the correct explanation of assertion
Step-by-step solution
A slight thinning of ozone layer occurs naturally for a few months every year over Antarctica. It decreases by (67 ~ % ) every year. The primary chemicals responsible for ozone depletion are a group of chlorine containing compounds called chloroflurocarbons (CFCs), used as coolants in air conditioners and refrigerators (freon) and propellants for aerosol cans and form blowing agents for insulation and packaging and also as solvents. Besides halons, methyl bromide, methyl chloroform, carbon tetrachloride and nitrous