Class IX

Nitrogen fixation can be done by
  1. Industries
  2. Rhizobium
  3. Lightening
  4. all of above
Depletion of ozone molecules in the stratosphere is due to
  1. Chlorine compound
  2. Fluorine compound
  3. Halogen compound
  4. None of these
On moon the temperature ranges from -190° C to 110° C. This is due to
  1. No water bodies present
  2. Water bodies present
  3. No bio geo chemical cycle
  4. No atmosphere
Nitrogen fixation can be done by
  1. Industries
  2. Rhizobium
  3. Lightening
  4. all of above
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
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