The earth’s atmosphere contains over _____ % by volume of nitrogen gas:

Related Mcqs:

1. The ration of volume of pores in the soil to the total soil volume is referred to as:

   A. Pore frequency ratio B. Pore density ration C. Pore abundance ratio D. Pore space ratio...

2. The natural nitrogen cycle is greatly affected by the excessive use of:

   A. Sulphate fertilizers B. Insecticides C. Phosphate fertilizers D. Nitrate fertilizers...

3. The bacteria, which reduce nitrates in the soil to gaseous nitrogen, are known as denitrifying bacteria such as:

   A. Nitromonas B. Pseudomonas C. Nostoc D. Rhizobium...

4. Ecosystem receives nitrogen from outside through:

   A. Biological nitrogen fixation B. Electrification of nitrogen C. Industries D. All the above...

5. Relationship between nitrogen fixing bacteria and a legume plant is described as:

   A. Mutualistic B. Parasitic C. Saprophytic D. Commensal...

6. Nitrogen oxides produced from the emission of automobiles and power plants, are the source of fine air borne particles which lead to:

   A. Photochemical smog B. Dry acid deposition C. Industrial smog D. Wet acid deposition...

7. The SO2 is returned to the atmosphere by:

   A. Metabolism of producers B. Metabolism of consumers C. Both (a) & (b) D. Combustion of fuel...

8. Ozone layer of upper atmosphere is being destroyed by:

   A. Sulphur di-oxide B. Carbon di-oxide C. Chloro-fluoro-carbon D. Smog...

9. Presence of SO2 in atmosphere is indicated by:

   A. Mosses B. Liver worts C. Lichens D. Ferns...

10. The zone of atmosphere that lies near the ground is:

    A. Troposphere B. Stratosphere C. Homosphere D. Heterosphere...