0XYGEN CYCLE – History, Cycle, Steps involved, Production, Significance & More

0XYGEN CYCLE - History, Cycle, Steps involved, Production, Significance & More
0XYGEN CYCLE - History, Cycle, Steps involved, Production, Significance & More


As we all know, air is a gas mixture. The atmosphere is made up of various gases, including nitrogen (78%), oxygen (21%), argon, and other trace gases (1 percent ).
According to Earth’s history, cyanobacteria were the first to introduce oxygen gas through the process of photosynthesis. Previously, around 4.6 billion years ago, there was no life on Earth because the atmosphere lacked oxygen. Later, oxygen levels gradually increased, and by the Carboniferous Period- 299 million years ago- oxygen levels had reached levels comparable to today’s estimates.
Today, oxygen is abundant in the atmosphere and can be dissolved in water. It is the second most abundant gas in the atmosphere and the most prevalent element in the human body. It is required for most life forms on Earth and is also a component of biomolecules such as proteins and nucleic acids.

What is oxygen cycle called?

The two most important cycles in the biosphere are respiration and photosynthesis. When animals and humans breathe, they consume oxygen for use in metabolic processes while exhaling carbon dioxide. Photosynthesis, which is primarily performed by plants and plankton, is the inverse of this process.
The oxygen cycle is the biogeochemical cycle of oxygen atoms in ions, oxides, and molecules between different oxidation states via redox reactions within and between the planet’s spheres/reservoirs.
The term oxygen is commonly used in the literature to refer to the most common oxygen allotrope, elemental/diatomic oxygen (O2), because it is a common product or reactant in many biogeochemical redox reactions within the cycle. The oxygen cycle processes are classified as biological or geological, and they are evaluated as either a source (O2 production) or a sink (O2 consumption) (O2 consumption).

Who discovered oxygen cycle?

Joseph Priestley
The Earl of Shelburne’s librarian and tutor was Joseph Priestley (1733–1804), a Unitarian minister, teacher, author, and natural philosopher. Priestley pursued his gas investigations in this room, which was then a working laboratory. He discovered oxygen on August 1, 1774.

Why is oxygen cycle important?

The oxygen cycle is a biogeochemical cycle that is required to maintain the concentration and level of oxygen in the atmosphere. We all know that oxygen is required for combustion. Without the presence of oxygen… Oxygen, both free and dissolved in water, is the second most abundant uncombined element in the atmosphere, trailing only nitrogen.
The oxygen cycle, along with the carbon and nitrogen cycles, is critical to the survival of life on Earth. The oxygen cycle is a biological process that helps to maintain the oxygen level by moving through three major spheres of the earth: the atmosphere, the lithosphere, and the hydrosphere.

What are the steps of oxygen cycle?

The 02 Cycle Stages:
The 02 cycle consists of the following steps:
Stage 1: As a byproduct of photosynthesis, all green plants release 02 back into the atmosphere.
Stage 2: All aerobic organisms respire using free 02.
Stage 3: Animals expel carbon dioxide into the atmosphere, which plants use again during photosynthesis. The amount of 02 in the atmosphere is now balanced.

What are the primary oxygen processes in the atmosphere?

The four major processes that rely on atmospheric 02 are as follows:
a. Breathing is the physical process by which all living organisms, including plants, animals, and humans, inhale 02 from their surroundings and exhale carbon dioxide back into the atmosphere.
b. Decomposition is a natural and important process in the 02 cycle that occurs when an organism dies. The organic matter, along with the carbon, 02, water, and other components, is returned to the soil and air when a dead animal or plant decays into the ground.
c. Combustion: One of the most important processes occurs when any organic material, including fossil fuels, plastics, and wood, is burned in the presence of 02 and emits carbon dioxide into the atmosphere.
d. Rusting: This process, too, necessitates the presence of 02. The formation of oxides is referred to as oxidation. Metals such as iron or alloy rust when exposed to moisture and 02 for an extended period of time, and new oxide compounds are formed by the combination of 02 and the metal.

What is the Process of Oxygen Production?

a. Plants: Plants are the primary producers of 02 through the process of photosynthesis. Photosynthesis is a biological process that occurs in all green plants when they are exposed to sunlight. Plants use sunlight, water, and carbon dioxide to produce energy, and 02 gas is produced as a byproduct of this process.
b. Sunlight: Sunlight generates 02 as well. When sunlight reacts with water vapour in the atmosphere, some 02 gas is produced.


*Phytoplankton is one of the most important 02 producers, followed by terrestrial plants and trees.

  • When sunlight reacts with water vapour in the atmosphere, 02 is produced.
    *A large amount of 02 is stored in the earth’s crust as oxides, which cannot be used for respiration because it is only available in the combined state.
  • What is the significance of the 02 cycle?
    The Importance of the 02 Cycle:
    As we all know, one of the most important components of the earth’s atmosphere is 02. It is primarily required for: *Breathing. *Combustion. *Supporting aquatic life. *Organic waste decomposition.
    The 02 cycle is primarily concerned with maintaining the amount of 02 in the atmosphere. The entire cycle can be summarised as follows: the 02 cycle begins with photosynthesis in the presence of sunlight, releases 02 back into the atmosphere, which humans and animals breathe in 02 and breathe out carbon dioxide, and then returns to the plants.
  1. What exactly is the 02 cycle?
    The 02 cycle is a biogeochemical cycle that involves the circulation of 02 atoms in the earth via a series of complex processes.
  2. What is the definition of a biogeochemical cycle?
    A biogeochemical cycle is the process of moving or rotating matter through the ecosystem’s biotic and abiotic spheres.
  3. What are the primary 02 reservoirs?
    The main 02 reservoirs are:
    b biosphere.

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