what is oxygen cycle?

Oxygen is an important component of everyday life. We cannot survive without oxygen. It comprises about 21% of atmospheric air. It is a component of several biological molecules such as carbohydrates, proteins, nucleic acids, and fats.

Like carbon dioxide, oxygen too is cycled through the process of photosynthesis and respiration.Oxygen is also utilized during combustion or burning.

Steps of oxygen cycle.

Step 1)Animals take in oxygen through the process of respiration. And release CO2 into the atmosphere.

Step 2)Carbon dioxide, released by animals is used in plants in the process of photosynthesis.

Step 3)Plants release oxygen into the atmosphere as a by-product of photosynthesis.

step 4)Fuels need oxygen for combustion so they take oxygen and release CO2 into the atmosphere as a by product along with other gases like N2 etc.

Step5)CO2 is released into the air in the process of decaying of dead animals and plants.

step 6)This CO2 is taken by plants for the process of photosynthesis and O2 is released, and this process continues.

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the oxygen consumed by respiration and burning of fuels is returned by the process of photosynthesis.this process is called oxygen cycle.

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A large amount of the oxygen of the air is used up every moment for burning and respiration. Yet the proportion of oxygen in the air remains the same i.e., 21%. This is because plants keep renewing the oxygen in the air through photosynthesis. 
Like all other organisms plants use oxygen for respiration throughout the day and night. They produce oxygen only during the day. The circulation of oxygen between the air and the living world is known as oxygen cycle.
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All these processes together make up the oxygen cycle. The oxygen cycle is thus a biogeochemical cycle that describes the movement of oxygen within the earth's three main reservoirs – the lithosphere (land), the hydrosphere (water), and the atmosphere (air), which make up the earth's biosphere.
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