Explain oxygen cycle . ( Draw diagram )
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Answer:
The oxygen cycle describes the various forms in which oxygen is found and how it moves through different reservoirs on Earth. ... There are three major reservoirs of oxygen: the atmosphere, biosphere, and lithosphere. Some people also consider the hydrosphere, a subdivision of the biosphere, to be the fourth reservoir.
Oxygen Cycle
Oxygen is the second most abundant element in the atmosphere and is present to the extent of about 21 per cent and is essential for all life processes. Atmosphere and oceans are the main pool for oxygen. The oxygen dissolved in water (oceans, etc.) is responsible for sustaining aquatic plants and animals. It is also a constituent of oxide and carbonate ores. There is a continuous exchange of oxygen between the atmosphere and water surfaces of all water bodies. The total amount of oxygen in the biosphere is constant. The oxygen cycle is based on the exchange of oxygen among the segments of the environment, viz., atmosphere, hydrosphere, lithosphere and biosphere. It plays a key role in atmospheric chemistry and life process. The different steps involved in oxygen cycle are:
During respiration, organisms including animals and human beings consume oxygen from the air and give carbon dioxide into the atmosphere.
The green plants utilize carbon dioxide for photosynthesis, in which carbon dioxide reacts with water in presence of solar energy and a catalyst (chlorophyll) to produce carbohydrates and the formed oxygen is released into the atmosphere.
Oxygen is needed by bacteria and fungi during decomposition of organic matter. The products of decomposition (CO2 and H2O) are released into the atmosphere. The released CO2 and H2O are utilised during photosynthesis by green plants.
In the upper atmosphere, solar energy splits H2O to give H2 and O2 which are released i