Cycles of Life

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Cycles of Life
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Key Terms

• Nutrients chemical elements that are used by
  organisms to build and operate their bodies
• Biotic living organisms
• Abiotic non-living part of the environment
• Closed System little or no input of new
  materials from outside the system (eg earth)

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Carbon Cycle

• Photosynthesis and Cellular Respiration are the
  two main processes in the carbon cycle.
• Photosynthesis is the conversion of energy from
  the Sun to sugar by green plants.
• Cellular respiration is the conversion of sugar
  into energy in organisms.

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• Photosynthesis
• Carbon dioxide water energy ? sugar
  oxygen
• (C02) (H20)
  (C6H12O6) (O2)
• Cellular Respiration
• oxygen sugar ? carbon dioxide water
  energy
• (O2) (C6H12O6) (C02)
  (H20)

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Questions

• What three elements are carbohydrates (sugar)
  made from?
• What are the reactants (ingredients) in the
  equation for photosynthesis?
• What are the products?
• What are the reactants (ingredients) in the
  equation for cellular respiration?
• What are the products?

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Carboniferous Period

• During the carboniferous period, 300 million
  years ago, large areas of swamp became filled
  with decaying plant material.

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• The plant material was buried under layers of
  sediment. Because there was no oxygen,
  decomposers couldnt break it down and it became
  stuck.

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• Over millions of years, the plant matter was
  compressed and converted into coal and oil
  (fossil fuels).

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• Draw your own diagram of the carbon cycle that
  includes
• Plants
• Animals
• Fossil fuels
• Atmosphere

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Global Warming

• Because there is so much carbon in fossil fuels
  (millions of years of compression!), there is
  excessive carbon dioxide emitted when we burn
  them.