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
Explain some Characteristic Features of Mucor? 1. Stolons characteristics of Rhizopus are absent in Mucor. The aerial mycelium in Mucor consists of branched hyphae, which grow

In the offspring of a dihybrid self, what percentage of the individuals are themselves dihybrid?

For the cross in Part B, predict the frequencies of each of the phenotypes in the F1 progeny, and determine the genotype(s) present in each phenotypic class. Complete the diagram b

How many g of glucose will be required to make 750 ml of a 0.5% w/v solution? Please show all steps.

Explain Theory or Principle of Determination of Coliforms? Coliforms are gram negative, non-spore forming, facultative anaerobic bacteria which produce acid and gas on lactose

Q. What is Gastritis? Gastritis is an inflammatory lesion of the gastric mucosa, (the inner lining of the stomach). The problem is seen in two forms: a) Acute gastritis

Myocardial Protection :  To a great extent, the result of cardiac surgery depends on how well the myocardium is protected during cardio pulmonary bypass. Temporary depression of m

How does nondisjunction in meiosis I and meiosis II look in males and females? Diagram it.

different types of animals and their respiratory organ

Explain Microtube and Hedstorm file removal technique A Hedstorm file was then passed down the length of the tube until it engaged itself tightly between the obstruction an