Among the following which one is a biotic component ?
Soil
Temperature
Human
Animals
Among the following which is a nitrogen fixing bacteria ?
Rhizobium
Azetobacter
A and B
Streptococcus
The organism and the physical environment of the habitat form an ecological complex called :
Atmosphere
Hydrosphere
Lithosphere
Ecosystem
Name the process in which the ammonia is converted into nitrites and nitrates ?
Ammonification
Nitrification
Denitrification
Nitrogen assimilation
The nutrient element derived from the earth by the living organisms for the use in their growth and development are called :
Bio-geo environment
Bio-geo system
Bio-geo chemicals
Bio-geo complex
Name the organism which is involved in denitrification ?
Nitrobacter
Pseudomonas
Nostoc
Which gas is taken up by man and animals during respiration ?
Oxygen
Hydrogen
Carbon dioxide
Nitrogen
Which is the biggest storehouse of water ?
River
Pond
Lake
Ocean
Oxygen combines with nitrogen to produce :
Oxides of nitrogen
Oxides of carbon
Nitrous oxide
Study of inter-relationship of organs and their environment is called :
Biology
Ecology
Zoology
Ornithology