Nitrogen content of biosphere remains constant due to
Nitrogen fixation
Nitrogen cycle
Industrial pollution
Absorption of nitrogen
Rise of atmospheric temperature because of high concentration of carbon dioxide is known as
Green house effect
Biomagnification
Pollution
Ectone
Green-house gases are
Absorbers of long-wave radiations from earth
Transparent to both solar radiations and long-wave radiations from earth
Absorbers of solar radiations for warming the atmosphere of earth
Transparent to emissions from earth for passage into outer space
Biosphere consists of
Lithosphere
Atmosphere
Hydrosphere
All the above
Agents which make free atmospheric nitrogen available to plants are
Lightning
Free living nitrogen fixing bacteria
Symbiotic nitrogen fixing bacteria
Component of biosphere related with soil is
None of the above
Earth is an
Open system
Closed system
Both open and closed system
Neither A and B
Biogeochemical cycles are also known as
Sedimentary cycles
Gaseous cycles
Material cycling
Cyycles of water
A green house gas is
H2
CO
CO2
N2
The reason for green house effect is
Higher CO2 concentration causing global warming
Absorption of infra-red rays by gases and dust particles
Both A and B
Refraction of CO2
