Download App

Natural Resources — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceNatural Resources1 Mark
MCQ
Ozone layer is getting depleted because of:
  • A
    Excessive use of automobiles.
  • B
    Excessive formation of industrial units.
  • ✓
    Excessive use of man-made compounds containing both fluorine and chlorine.
  • D
    Excessive deforestation.
✓

Answer

Correct option: C.
Excessive use of man-made compounds containing both fluorine and chlorine.

Man-made causes of depletion of ozone layer: The main cause for the depletionof ozone is determined as excessive release of chlorine and bromine from man-made compounds such as chlorofluorocarbons $(CFCs).$ The emission of $ODS$ account for roughly $90\%$ of total depletion of ozone layer in stratosphere.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q. [1 M]" from Natural Resources→Natural Resources — all question types→Science STD 9 question papers→Gujarat Board STD 9 question papers→Gujarat Board question paper generator→

Similar questions

Elements $X, Y,$ and $Z$ have atomic numbers $6, 9$, and $12$ respectively. Which one has four electrons in its valence shell?
→
Harelip is a:
→
Which of the following situations are not possible?
→
When waste is broken down to make something new, it is called ____________________.
→
Which mathematical relation of energy of a stone of mass $m$ falling freely from height $h$ remains conserved at every point in its downward motion?
→
Symptomatic treatment needs which of the following procedures$?$
→
Velocity, being a vector quantity, positive velocity means:
→
Ecosystem comprises both abiotic and biotic components. Biotic component of an ecosystem consists of:
→
Fats are stored in human body as:
→
Which is the most important source of food and fodder?
→