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write a short not on oxygen cycle?

Oxygen cycle

  1. The largest reservoir of Earth 's oxygen is within the silicate and oxide minerals of the crust and mantle (99.5%). Only a small fraction is present as free oxygen in the biosphere (0.01%) and atmosphere (0.49%).
  2. Within the biosphere and atmosphere, plants mark the beginning of the oxygen cycle. Plants are able to use the energy from sunlight to convert carbon dioxide and water into carbohydrates and oxygen in a process called photosynthesis.
  3. Animals form the other half of the oxygen cycle. They breathe in oxygen which they use to break carbohydrates down into energy in a process called respiration.
  4. An additional supply of atmospheric oxygen comes from photolysis, whereby high energy ultraviolet radiation breaks down atmospheric water. The free Hydrogen and Nitrogen atoms escape into space leaving Oxygen in the atmosphere.
  5. Most of the Oxygen present in the atmosphere is used during respiration and decay mechanisms
  6. Oxygen is also cycled between the biosphere and lithosphere
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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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