The Carbon Cycle

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The Carbon Cycle
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photosynthesis cellular respiration

• 6CO2 6H2O energy C6H12O6 6O2

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Photosynthesis

• Plants and other related organisms produce their
  own food through photosynthesis. They are the
  autotrophes.
• Photosynthesis starts with water present in the
  soil, carbon dioxide from the atmosphere and
  energy from the sun.
• Chlorophyll is the green pigment in the
  chloroplasts of plant cells (gives them their
  color).
• In the chloroplasts light from the sun provides
  the energy needed to transform carbon dioxide and
  water into sugar.
• Photosynthesis also produces oxygen which the
  plant releases into the atmosphere.

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Respiration

• The cell works constantly to stay alive.
• It constructs macromolecules
• It transports substances into and out of the cell
  
• It moves (some cells)
• It grows
• It reproduces
• To accomplish these tasks and many others, the
  cell needs energy that it must get from its
  environment. We know that the sun is the energy
  for plants and other photosynthetic organisms,
  but what about the consumers?

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The organisms that must ingest their food (cant
make their own) are the heterotrophs.
These organisms use organic molecules in their
food (like sugar) to get the energy they need.
Cellular respiration uses the sugar in food to
make energy. The byproducts of cellular
respiration are water and carbon dioxide.
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Summary of the Carbon cycle

• Photosynthesis occurs only in the chloroplasts
  of producers. 6CO2 6H20 energy ? C6H12O6
  6O2.

• Cellular Respiration occurs in the mitochondria
  of producers AND consumers (done by all living
  things).
• C6H12O6 6O2 ? 6CO2 6H2O energy.

• The reactants of photosynthesis (LHS) are the
  products of cellular respiration (RHS). The
  products of photosynthesis are the reactants of
  cellular respiration.
• Photosynthesis stores energy in sugar molecules,
  cellular respiration breaks the bonds in the
  sugar molecule to release that energy.

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Homework

• Read pages 43, 46-47,50.
• Do questions 1-7 on page 51