PHOTOSYNTHESIS

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PHOTOSYNTHESIS
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I. Autotrophs and Heterotrophs

• A. Energy for living things comes from the SUN
• B. Plants and other organisms use light energy
  from the sun to produce food
• C. Autotrophs- make their own food
• Ex plants

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• Heterotrophs- cannot use sun energy to make
• their food and obtain it from the foods they
  consume
• Ex leopards, mushrooms

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II. Chemical Energy and ATP

• A. To live, organisms must release energy in
  sugars and other compounds

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• B. ATP
• adenosine triphosphate
• chemical compound used to store energy

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C. Releasing energy from ATP

• -gt Stored energy is released from ATP when ATP is
  broken down into ADP Phosphate
• -gt Add/subtract Phosphate and you can
  store/release ENERGY!

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• D. When is ATP used?
• Active transport
• Powers movement inside cell microtubules use
  energy

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III. Light Pigments

• A. Photosynthesis requires LIGHT and
  CHLOROPHYLL, a molecule in chloroplasts, in
  addition to water CO2
• B. Sunlight is white but contains mixtures of
  visible wavelengths
• C. Plants gather suns energy using
  light-absorbing molecules called PIGMENTS

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D. Leaves absorb blue-violet red-orange light
very well E. Green light is reflected- why
plants look green!
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IV. LOCATION OF PHOTOSYNTHESIS
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V. Role of Pigments

• A. When chlorophyll absorbs light, much of the
  energy is transferred to raising the ENERGY LEVEL
  in the CHLOROPLASTS

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B. EQUATION
Inputs Light, carbon dioxide, water Outputs
sugar and oxygen
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Factors Affecting Photosynthesis

• Shortage of raw materials
• Temperature
• Light intensity