Section 1:  Energy Flow in Ecosystems

Chapter 5 Section 1 Presentation
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Key Terms:

• photosynthesis
• producer
• consumer
  
• decomposer
  
• cellular respiration
  
• food chain
  
• food web
  
• ​trophic level
  

Main Ideas:

• The majority of the Earth's organisms depend on the sun for energy.  Producers harness the sun's energy directly through photosynthesis, while consumers use the sun's energy indirectly by eating producers or other consumers.
• The paths or energy transfer can be followed through food chains, food webs, and trophic levels.
  
• Only about 10 percent of the energy that an organism consumes is transferred to the next trophic level when the organism is eaten.