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
RECAPITUL A TIO N THEORY / BIOGENETIC LAW It was proposed by Muller & Haeckel on the basis of Baer's law. According to it, in the development of animal phylum characters

What are the final digestion products of (a) protein, (b) fat, (c) starch?   a) Proteins are digested to amino acids, b) fats are digested to fatty acids and glycerol,

Define Affluence and abundant availability of food as factor for obesity? With increasing affluence, increase in purchasing power and abundance of food, people tend to eat more

Explain the Peripheral Resistance Resistance offered by arterioles or resistance vessels, as you have read above, is termed as peripheral resistance. Changes in peripheral resi

F a t cow syndrome Fat cow syndrome, also known as fatty infiltration of liver, is a highly fatal disease in high yielding dairy animals that occurs a few days before or afte

Three charges are arranged as shown in the figure below. Find the magnitude and direction of the electrostatic force on the charge q = 4.78 nC at the origin. (Let r12 = 0.260 m.)

Cell theory is one of the four (or five) unifying concepts in the biology. The cell theory states that all the living things are composed of at least one cell and that cell is the

F a c t o r s responsible for transboundary diseases Factors that affect the entry, establishment and spread of animal diseases include globalization; human population gr

give outline classification of coelenterata

Vapour Pressure The intermolecular forces in a liquid prevent most molecules from escaping from the surface. However, due to molecular collisions, some molecules have sufficien