oxygen cycle

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Oxygen Cycle
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PRESENTED BY GROUP 5

• UMER FAROOQ.
• ANUM AJMAL .
• MISBAH SADIQ.
• NOMAN HAFEEZ.

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Overview
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What is oxygen?

• Is the colourless , odourless and tasteless gas.
• Oxidation it is the process of uniting or of
  causing a substance to unite with the oxygen.

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Discovery of oxygen.

• Carl Wilhelm Schele a Swedish chemist who
  discovered oxygen for the first time in 1772.

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Required for life

• All living things use oxygen or depend on
  organisms that use oxygen in some way.

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Biological importance of oxygen.

• Humans need it to breathe.
• Needed for decomposition of organic waste.
• Water can dissolve oxygen and it is this
  dissolved oxygen that supports aquatic life.

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All Animals and Other Consumers Use Oxygen

• We use oxygen to break down simple sugar and
  release energy.
• This can be done through respiration or
  fermentation.
• Animal mainly use respiration.

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Respiration

• The process that breaks apart simple food
  molecules to release energy.
• It occurs inside cells.
• What YOU do with the oxygen you take in?

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Cycle Of Respiration.
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Simple Sugar Glucose

• The molecule most living things use for energy
  including us!
• We break down food into smaller molecules during
  digestion. One of the small molecules is glucose.
• Glucose leaves your intestines, goes into your
  blood and is taken to every cell in your body.

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Respiration in Cells

• In your cells, oxygen is used to split glucose
  apart releasing energy, water and carbon
  dioxide.

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TODAY

• The easts atmosphere consists of 21 oxygen
• The earths lithosphere consists of 99.5 oxygen
• The earths hydrosphere consists of 46.60
  oxygen.
• The earths biosphere consists of 0.01 oxygen.

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Photosynthesis

• Plants take in carbon dioxide and water and use
  them to make food. Their food is simple sugar
  glucose.

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Releasing Of Oxygen.
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Photosynthesis (continued)

• Plants pull the carbon off CO2 and use the carbon
  in glucose. (They do not need the oxygen for
  this. They get that from water, H2O.)
• Plants release the oxygen (O2) back into the
  atmosphere.
• Other organisms use the free oxygen for
  respiration.

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Photosynthesis and Cellular Respiration Chemical
Relation

• Photosynthesis uses carbon dioxide and produces
  oxygen.
• Cellular respiration uses oxygen and produces
  carbon dioxide.

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Respiration
Photosynthesis
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Oxygen in aquatic environment

• This happens on land and in the water.
• Algae and aquatic plants produce food underwater
  through photosynthesis.
• They are present 20 in atmosphere.
• Other aquatic organisms use the dissolved oxygen
  these plants release into the water.

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Human Impact

• We keep destroying natural areas, especially
  forested areas with many plants and replacing
  them with buildings, parking lots, lawns, etc.
• Fewer plants mean less oxygen and more carbon
  dioxide.
• This disturbs the balance of the natural cycle.

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What We Need to Do

• Stop destroying and promote re-growth of natural
  areas especially forests.
• Burn less (fossil fuels, forest fires, etc.)

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Summary.

• Name-oxygen
• Symbol-O
• Atomic no.-8
• Uses-for oxidation reactions for the respiration
  for the respiratory function of humans, animals,
  plant, some types of bacteria e.tc.
• Sources- photolysis, photosynthesis.
• Reservoir-biosphere, atmosphere, lithosphere.

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SUPERVISION OF

• SIR ABDUL BASIT AZIZ SHB.

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• Thank
• you

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QUESTION SESSION?