Oxygen cycle, Biology

Oxygen is a major component of all living organisms. All the organisms and plants required oxygen for aerobic respiration which they absorb from environment. Only plants release oxygen into environment during photosynthesis. Earth atmosphere contains 20.99% of O2.

Thus oxygen cycle is the biogeochemical cycle that describes the movement of oxygen within and between its three main reservoirs- The biosphere (living) the atmosphere (air) and the lithosphere (earth crust).  This cycle includes:

(i)        The main driving factor for oxygen cycle is photosynthesis, which is responsible for modern earth's atmosphere and life. This process produces oxygen and sugar by utilizing CO2 and water in presence of sunlight and chlorophyll.

 

                        Sunlight

6CO2+6H2O        284_food chain.png         C6H12O6+6O2

 

 

(ii)      Oxygen also enters into atmosphere by process of photolysis in which high energy U.V radiations breaks down atmosphere water and nitrous oxide back into its component atoms.

              U.Vrays

2H2O       284_food chain.png       4H+O2

               U.V.rays

2H2O      284_food chain.png         4H+O2

(iii)    Oxygen is mainly consumed from atmosphere via respiration and natural decay mechanism in which animals, plants and bacteria consume oxygen and release carbon dioxide.

                        respiration

C6H12O6+6O   284_food chain.png        6CO2+6H2O

 

(iv)             Some of oxygen is also consumed in natural oxidation of various mineral on earth crust.

Oxygen is also cycle between biosphere and lithosphere in which marine organisms play important role. Marine organisms have calcium carbonate sheet. That after death is deposited on sea floor and forms limestone rock in the lithosphere.

Posted Date: 7/11/2012 7:11:11 AM | Location : United States







Related Discussions:- Oxygen cycle, Assignment Help, Ask Question on Oxygen cycle, Get Answer, Expert's Help, Oxygen cycle Discussions

Write discussion on Oxygen cycle
Your posts are moderated
Related Questions
In one study of a heavily polluted area near Birmingham, England, a researcher observed a frequency of 87% melanic Biston betlularia. Calculate the frequency of the dominant allele

Explain some Do's and Don'ts when working in Laboratory? 1) Always wear a lab coat when working a laboratory. 2) Ensure that no harm is caused to yourself or the people work

As with food crops, the "discovery, domestication and cultivation" of ornamental plants have a long history. There is  indication that lilies were cultivated in China for both medi

Q What is signifying by concentration gradient? Is it correct or not to refer to "concentration gradient of water"? Concentration gradient is the variation of concentration of

What is the difference between anabolism and catabolism? Metabolism comprises two opposing processes: anabolism and catabolism. Anabolism is a set of synthesis reactions that t

Water Pollution Water is one of the most essential requirements for the survival of all living organisms. Water is used for household, agricultural, industrial and recreation

What are clotting factors? Clotting factors are substances (enzymes, coenzymes, reagents) essential for the clotting stages to happen. Besides those triggering factors and reag

What Devices Used for Oxygen Therapy? Variable performance systems: With these devices, the FiO 2 would vary depending on the patient's breathing pattern. In general, rapid, s

Question: a) Why is it important to maintain good standards of Indoor Air Quality in modern offices. Briefly explain the potential air pollutants encountered in such working

Q. Which are the most important inorganic molecular substances for living beings? The most important inorganic substances for living beings are mineral salts, water, molecular