![OXYGEN CYCLE : EASY WAY TO
EXPLAIN BIOGEOCHEMICAL CYCLE
OXYGEN CYCLE
INTRODUCTION
It is a type of cyclic flow of nutrients between non- living components like soil, rock air and
water and living organisms and micro oganism (Pseudomonas and Aeruginosa). It makes
the biosphere dynamic. In oxygen cycle there is a cyclic flow of atmospheric oxygen.
Photosynthesis releases oxygen in the atmosphere. Respiration absorbs oxygen. By
photosynthesis plant produces organic molecules (C6 H12 O6). By respiration that organic
molecule is oxidized to release energy and carbon oxide.
IMPORTANT POINTS IN OXYGEN
CYCLE [Pseudomonas and Aeruginosa]
In atmosphere, oxygen cycle maintains the proper level of oxygen with required
proportion.Oxygen cycle maintains the level of oxygen in the atmosphere. The living
organisms use up important gases as oxygen from the atmosphere by combustion or
burning, cellular respiration and in the formation of oxides of nitrogen.
Photosynthesis is the only major process green plants . In this way oxygen returns to the
atmosphere. So we can say green plants are the major source of oxygen in the atmosphere.
Beside oxygen cycle there are some other biogeochemical cycle like Nitrogen cycle
including Pseudomonas and Aeruginosa, carbon cycle and ozone layer.
NITROGEN CYCLE WITH OXYGEN
CYCLE [INCLUDING Pseudomonas and Aeruginosa]
Nitrogen is an important nutrient for all life- forms which
includes Pseudomonas and Aeruginosa. Nitrogen is present as element in the atmosphere ,
then it passes from its elemental form into simple nitrogenous compounds present in the soil
in nitrogen cycle where various bacteria like Pseudomonas and Aeruginosa take part in
oxygen cycle and water. It enters the living beings and forms complex molecules in them as
nucleic acid, protein molecule etc. These complex molecules are then broken down again to
release nitrogen back into atmosphere by Pseudomonas and Aeruginosa.
Nitrogen cycle involves following important steps like
[Pseudomonas and Aeruginosa]
NITROGEN FIXATION: nitrogen fixing bacteria like Rhizobium converts inert nitrogen
into nitrates or nitrite. These bacteria in nitrogen cycle in oxygen cycle leave in the roots
of leguminous plants. By lightning also this conversion occurs.
NITROGEN ASSIMILATION: Plants absorb nitrates and nitrites and convert them to
amino acids. Amino acid is the main component of protein. Animals can intake this
protein in nitrogen cycle in oxygen cycle directly or indirectly.
AMMONOFICATION : It is the process of production of ammonia in nitrogen cycle in
oxygen cycle. It occurs by the decomposition of dead plants and animals.
NITRIFICATION: Here ammonia converts into nitrites, then to nitrates. Nitrifying bacteria
like Nitrosomonas and Nitrobacter . The following reaction is NH4
+
————à NO2
–
——](https://image.slidesharecdn.com/oxygencycle-230705090444-d3a54c5e/85/OXYGEN-CYCLE-docx-1-320.jpg)
![—–à NO3
–
. NH4 ion to NO2 ion conversion done by Nitrosomonas bacteria. NO2 ion to
NO3 ion change is done by Nitrobacter.
DENITRRIFICATION: It is the process of reducing nitrates or ammonia, present in the soil
to molecular nitrogen (N2). It goes back into the
atmosphere. Pseudomonas and Aeruginosa bacteria does this process.
THE CARBON CYCLE WITH
OXYGENCYCLE [Pseudomonas and Aeruginosa
]
We find carbon in various forms on the earth. It occurs in the elemental form as diamond and
graphite. In combined state we find carbon as
In the atmosphere as carbon di oxide.
Various minerals contain carbonate and hydrogen carbonate salts.
Fossil fuels like coal, petroleum and natural gas.
Carbon containing molecules like proteins, fats, nucleic acid, vitamins, carbohydrates.
Endoskeleton and exoskeleton of various animals like mollusk, fish, mammals.
Pseudomonas and Aeruginosa
Nature incorporate carbon in our life by photosynthesis through plants. During this process
green plats prepare food with the help of water, sunlight and CO2.
The other processes that give out carbon di oxide into atmosphere are
Pseudomonas and Aeruginosa
Decomposition of dead plants and animals by decomposers.
Combustion of fossil fuels like coal and petroleum in large scale.
Weathering of rocks and volcanic eruptions.
THE OXYGEN CYCLE
Pseudomonas and Aeruginosa
Oxygen is an abundant element forming about 20.95% or 21% of the atmospheric gases. In
various organic molecules like proteins, fats and carbohydrates, oxygen plays an important
role as component.
In Earth’s crust it is found as oxides of many metals and also as carbonate, sulphate, nitrate
and other minerals. It is present in combined form also as in carbon di-oxide and in water.
In oxygen cycle , oxygen level in atmosphere is properly maintained. Various physiological
and physical processes like combustion, respiration and formation of oxides of nitrogen use
up the atmospheric oxygen.
Photosynthesis is the only major process, by which oxygen is returned to the atmosphere.
That iswhy we can say the green plants as one of the important sources of oxygen.](https://image.slidesharecdn.com/oxygencycle-230705090444-d3a54c5e/85/OXYGEN-CYCLE-docx-2-320.jpg)
![OZONE LAYER IN OXYGEN
CYCLE [Pseudomonas and Aeruginosa]
Ozone is a tri atomic molecule of oxygen with the formula O3. it is found in the upper region of
the atmosphere , above the region where elemental oxygen (diatomic molecule) is present.
Ozone is poisonous and luckily, it is not stable near Earth’s surface.
IMPORTANCE OF OZONE IN OXYGEN CYCLE [Pseudomonas and Aeruginosa]
Ozone forms a thick layer like a shield in the upper region of atmosphere and absorbs
ultraviolet radiations from the sun. in this way, ozone layer prevents these radiation from
reaching the surface of the earth. Ozone gas protects whole living world from UV radiation..
THREAT TO OZONE LAYER IN OXYGEN CYCLE
Various man-made materials like chlorofluorocarbons or CFCs are very stable as it is made
up of fluorine and chlorine. Natural biological process cannot degrade these CFCs. So this
harmful chemicals reach the ozone layer. They react with this layer. It results in the reduction
or thinning of ozone layer. For this reason there is an OZONE HOLE above Antarctica in
1985.
QUESTION RELATED TO OXYGEN CYCLE AND OTHER BIO-GEO- CHEMICAL CYCLE
Qs1: What is the percentage of oxygen found in the atmosphere?
Ans1: 20.94% oxygen is present in atmosphere.
Qs2: Name any two compounds of oxygen found in nature.
Ans2: Diatomic compound is oxygen (O2). Triatomic compound is ozone (O3).
Qs3: Name any three processes in which oxygen is used up in atmosphere.
Ans3 : Living organism using oxygen in the following processes
Respiration in all living organism
Combustion of fossil fuel
Decomposition of organic matter
Qs4: Carbon di-oxide is necessary gas for plants. Why do we then consider it as a pollutant?
Ans4: Plants need carbon di oxide gas to perform photosynthesis process. But this gas
is also a green house gas. Up to 350 ppm concentration in atmosphere, it is both a
good raw material as well as essential for keeping the earth warm.
But, when concentration of this gas rises from its specified level, it starts acting as a
pollutant and causes pollution and global warming. It results increase of temperature
of earth which leads to global warming. It also causes melting of polar ice and glaciers
which causes submerging of coastal area.](https://image.slidesharecdn.com/oxygencycle-230705090444-d3a54c5e/85/OXYGEN-CYCLE-docx-3-320.jpg)
OXYGEN CYCLE.docx
- 1. OXYGEN CYCLE : EASY WAY TO EXPLAIN BIOGEOCHEMICAL CYCLE OXYGEN CYCLE INTRODUCTION It is a type of cyclic flow of nutrients between non- living components like soil, rock air and water and living organisms and micro oganism (Pseudomonas and Aeruginosa). It makes the biosphere dynamic. In oxygen cycle there is a cyclic flow of atmospheric oxygen. Photosynthesis releases oxygen in the atmosphere. Respiration absorbs oxygen. By photosynthesis plant produces organic molecules (C6 H12 O6). By respiration that organic molecule is oxidized to release energy and carbon oxide. IMPORTANT POINTS IN OXYGEN CYCLE [Pseudomonas and Aeruginosa] In atmosphere, oxygen cycle maintains the proper level of oxygen with required proportion.Oxygen cycle maintains the level of oxygen in the atmosphere. The living organisms use up important gases as oxygen from the atmosphere by combustion or burning, cellular respiration and in the formation of oxides of nitrogen. Photosynthesis is the only major process green plants . In this way oxygen returns to the atmosphere. So we can say green plants are the major source of oxygen in the atmosphere. Beside oxygen cycle there are some other biogeochemical cycle like Nitrogen cycle including Pseudomonas and Aeruginosa, carbon cycle and ozone layer. NITROGEN CYCLE WITH OXYGEN CYCLE [INCLUDING Pseudomonas and Aeruginosa] Nitrogen is an important nutrient for all life- forms which includes Pseudomonas and Aeruginosa. Nitrogen is present as element in the atmosphere , then it passes from its elemental form into simple nitrogenous compounds present in the soil in nitrogen cycle where various bacteria like Pseudomonas and Aeruginosa take part in oxygen cycle and water. It enters the living beings and forms complex molecules in them as nucleic acid, protein molecule etc. These complex molecules are then broken down again to release nitrogen back into atmosphere by Pseudomonas and Aeruginosa. Nitrogen cycle involves following important steps like [Pseudomonas and Aeruginosa] NITROGEN FIXATION: nitrogen fixing bacteria like Rhizobium converts inert nitrogen into nitrates or nitrite. These bacteria in nitrogen cycle in oxygen cycle leave in the roots of leguminous plants. By lightning also this conversion occurs. NITROGEN ASSIMILATION: Plants absorb nitrates and nitrites and convert them to amino acids. Amino acid is the main component of protein. Animals can intake this protein in nitrogen cycle in oxygen cycle directly or indirectly. AMMONOFICATION : It is the process of production of ammonia in nitrogen cycle in oxygen cycle. It occurs by the decomposition of dead plants and animals. NITRIFICATION: Here ammonia converts into nitrites, then to nitrates. Nitrifying bacteria like Nitrosomonas and Nitrobacter . The following reaction is NH4 + ————à NO2 – ——
- 2. —–à NO3 – . NH4 ion to NO2 ion conversion done by Nitrosomonas bacteria. NO2 ion to NO3 ion change is done by Nitrobacter. DENITRRIFICATION: It is the process of reducing nitrates or ammonia, present in the soil to molecular nitrogen (N2). It goes back into the atmosphere. Pseudomonas and Aeruginosa bacteria does this process. THE CARBON CYCLE WITH OXYGENCYCLE [Pseudomonas and Aeruginosa ] We find carbon in various forms on the earth. It occurs in the elemental form as diamond and graphite. In combined state we find carbon as In the atmosphere as carbon di oxide. Various minerals contain carbonate and hydrogen carbonate salts. Fossil fuels like coal, petroleum and natural gas. Carbon containing molecules like proteins, fats, nucleic acid, vitamins, carbohydrates. Endoskeleton and exoskeleton of various animals like mollusk, fish, mammals. Pseudomonas and Aeruginosa Nature incorporate carbon in our life by photosynthesis through plants. During this process green plats prepare food with the help of water, sunlight and CO2. The other processes that give out carbon di oxide into atmosphere are Pseudomonas and Aeruginosa Decomposition of dead plants and animals by decomposers. Combustion of fossil fuels like coal and petroleum in large scale. Weathering of rocks and volcanic eruptions. THE OXYGEN CYCLE Pseudomonas and Aeruginosa Oxygen is an abundant element forming about 20.95% or 21% of the atmospheric gases. In various organic molecules like proteins, fats and carbohydrates, oxygen plays an important role as component. In Earth’s crust it is found as oxides of many metals and also as carbonate, sulphate, nitrate and other minerals. It is present in combined form also as in carbon di-oxide and in water. In oxygen cycle , oxygen level in atmosphere is properly maintained. Various physiological and physical processes like combustion, respiration and formation of oxides of nitrogen use up the atmospheric oxygen. Photosynthesis is the only major process, by which oxygen is returned to the atmosphere. That iswhy we can say the green plants as one of the important sources of oxygen.
- 3. OZONE LAYER IN OXYGEN CYCLE [Pseudomonas and Aeruginosa] Ozone is a tri atomic molecule of oxygen with the formula O3. it is found in the upper region of the atmosphere , above the region where elemental oxygen (diatomic molecule) is present. Ozone is poisonous and luckily, it is not stable near Earth’s surface. IMPORTANCE OF OZONE IN OXYGEN CYCLE [Pseudomonas and Aeruginosa] Ozone forms a thick layer like a shield in the upper region of atmosphere and absorbs ultraviolet radiations from the sun. in this way, ozone layer prevents these radiation from reaching the surface of the earth. Ozone gas protects whole living world from UV radiation.. THREAT TO OZONE LAYER IN OXYGEN CYCLE Various man-made materials like chlorofluorocarbons or CFCs are very stable as it is made up of fluorine and chlorine. Natural biological process cannot degrade these CFCs. So this harmful chemicals reach the ozone layer. They react with this layer. It results in the reduction or thinning of ozone layer. For this reason there is an OZONE HOLE above Antarctica in 1985. QUESTION RELATED TO OXYGEN CYCLE AND OTHER BIO-GEO- CHEMICAL CYCLE Qs1: What is the percentage of oxygen found in the atmosphere? Ans1: 20.94% oxygen is present in atmosphere. Qs2: Name any two compounds of oxygen found in nature. Ans2: Diatomic compound is oxygen (O2). Triatomic compound is ozone (O3). Qs3: Name any three processes in which oxygen is used up in atmosphere. Ans3 : Living organism using oxygen in the following processes Respiration in all living organism Combustion of fossil fuel Decomposition of organic matter Qs4: Carbon di-oxide is necessary gas for plants. Why do we then consider it as a pollutant? Ans4: Plants need carbon di oxide gas to perform photosynthesis process. But this gas is also a green house gas. Up to 350 ppm concentration in atmosphere, it is both a good raw material as well as essential for keeping the earth warm. But, when concentration of this gas rises from its specified level, it starts acting as a pollutant and causes pollution and global warming. It results increase of temperature of earth which leads to global warming. It also causes melting of polar ice and glaciers which causes submerging of coastal area.