Class IX

Life cannot sustain on Mars and Venus because major component in atmosphere is
  1. oxygen
  2. carbon di oxide
  3. Nitrogen
  4. Ozone
Depletion of ozone molecules in the stratosphere is due to
  1. Chlorine compound
  2. Fluorine compound
  3. Halogen compound
  4. None of these
Burning of fossil fuels add
  1. CO2, SO2, NO2, gases in air
  2. C, SO2, N2, gases in air
  3. CO, SO3, NO3, gases in air
  4. CH4, CO2, NO2, gases in air
Depletion of ozone molecules in the stratosphere is due to
  1. Chlorine compound
  2. Fluorine compound
  3. Halogen compound
  4. None of these
Greenhouse gases are
  1. Industries
  2. Rhizobium
  3. Lightening
  4. All of these
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