Question

Explain in brief
1) carbon cycle
2) nitrogen cycle
3)Oxygen cycle

Answer 1

1.

the series of processes by which carbon compounds are interconverted in the environment, involving the incorporation of carbon dioxide into living tissue by photosynthesis and its return to the atmosphere through respiration, the decay of dead organisms, and the burning of fossil fuels

2 the series of processes by which nitrogen and its compounds are interconverted in the environment and in living organisms, including nitrogen fixation and decomposition

3 The oxygen cycle is the biogeochemical cycle of oxygen within its four main reservoirs

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Answer 2

Carbon is exchanged among the biosphere, pedosphere, geosphere, hydrosphere and the atmosphere of the Earth through a biogeochemical Nitrogen is available in abundance in our atmosphere (78%), however, this nitrogen is useless to animals and plants until it is converted to ammonia and other nitrogen compounds. This conversion process is called Nitrogen Fixation. And through a process is called denitrification, once these plants and animals are dead, this ammonia is broken down by bacteria and fungi and returned to the atmosphere as Nitrogen.
About 21% of our air is composed of oxygen. It is also an atom in the molecule of water (H2O). Oxide compounds, such as CO2 also contain oxygen.About 21% of our air is composed of oxygen. It is also an atom in the molecule of water (H2O). Oxide compounds, such as CO2 also contain oxygen.