Explain the processes of how oxygen cycles through water.
Answers
Answer:
As we all know, the air is a mixture of gases. The air in the atmosphere is composed of different gases, namely nitrogen (78%), oxygen (21%), argon and other trace gases (1%).
According to Earth’s history, oxygen gas was first introduced by cyanobacteria through the process of photosynthesis. Earlier, around 4.6 billion years ago, there was no life on planet earth because the atmosphere was devoid of oxygen. Later, there was a gradual increase in the oxygen levels and by the Carboniferous Period- 299 million years ago, oxygen reached the levels that were similar to today’s estimates.
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Answer:
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.