Nitrogen content of biosphere remains constant due to
Nitrogen fixation
Nitrogen cycle
Industrial pollution
Absorption of nitrogen
Process of evapo-transpiration and precipitation is called
Carbon cycle
Hydrological cycle
All the above
Amount of carbon fixed annually through photosynthesis is
4.6 Χ 1010 kg
7 Χ 1013 kg
7 Χ 1020 kg
4.6 Χ 1021 kg
Biosphere consists of
Lithosphere
Atmosphere
Hydrosphere
Source of energy in the biosphere is
Producer
Decomposer
Sunlight
Heat of earth
A green house gas is
H2
CO
CO2
N2
Biogeochemical cycles are also known as
Sedimentary cycles
Gaseous cycles
Material cycling
Cyycles of water
Component of biosphere related with soil is
None of the above
Agents which make free atmospheric nitrogen available to plants are
Lightning
Free living nitrogen fixing bacteria
Symbiotic nitrogen fixing bacteria
Phenomenon of rain,dew,snow i.e., different forms of water coming to earth under force of gravity is called as
Geotropism
Climate factors
Precipitation
Calcification
