A. 58
B. 68
C. 78
D. None of these
Related Mcqs:
- 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 - The natural nitrogen cycle is greatly affected by the excessive use of:
A. Sulphate fertilizers
B. Insecticides
C. Phosphate fertilizers
D. Nitrate fertilizers - 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 - Ecosystem receives nitrogen from outside through:
A. Biological nitrogen fixation
B. Electrification of nitrogen
C. Industries
D. All the above - Relationship between nitrogen fixing bacteria and a legume plant is described as:
A. Mutualistic
B. Parasitic
C. Saprophytic
D. Commensal - 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 - The SO2 is returned to the atmosphere by:
A. Metabolism of producers
B. Metabolism of consumers
C. Both (a) & (b)
D. Combustion of fuel - Ozone layer of upper atmosphere is being destroyed by:
A. Sulphur di-oxide
B. Carbon di-oxide
C. Chloro-fluoro-carbon
D. Smog - Presence of SO2 in atmosphere is indicated by:
A. Mosses
B. Liver worts
C. Lichens
D. Ferns - The zone of atmosphere that lies near the ground is:
A. Troposphere
B. Stratosphere
C. Homosphere
D. Heterosphere
The correct answer to the question: "The earth’s atmosphere contains over _____ % by volume of nitrogen gas:" is "78 ".
