Biosphere is defined as
Part of the earth water and atmosphere which inhabits living organisms
Part of the soil where animals and plants are found
Atmosphere in which life exists
None of the above
A green house gas is
H2
CO
CO2
N2
Source of energy in the biosphere is
Producer
Decomposer
Sunlight
Heat of earth
Earth is an
Open system
Closed system
Both open and closed system
Neither A and B
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
Biogeochemical cycles are also known as
Sedimentary cycles
Gaseous cycles
Material cycling
Cyycles of water
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
Ozone layer is found in
Thermosphere
Stratosphere
Lithosphere
Mesosphere
Agents which make free atmospheric nitrogen available to plants are
Lightning
Free living nitrogen fixing bacteria
Symbiotic nitrogen fixing bacteria
All the above
