Class IX

The life supporting zone of the earth is
  1. . Lithosphere
  2. Hydrosphere
  3. Atmosphere
  4. Biosphere
In the atmosphere, the layer above the troposphere is _____.
  1. Stratosphere
  2. Exosphere
  3. Mesosphere
  4. Thermosphere
Greenhouse gases are
  1. Industries
  2. Rhizobium
  3. Lightening
  4. All of these
Which one of the following is not a fossil fuel?
  1. Natural gas
  2. Petrol
  3. Coal
  4. Uranium
Life cannot sustain on Mars and Venus because major component in atmosphere is
  1. Oxygen
  2. Carbon dioxide
  3. Nitrogen
  4. Ozone
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