energy transfer and decay

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  • Created by: 11penny.j
  • Created on: 21-04-16 17:34
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  • energy transfer & decay
    • enrgy from the sun is the source of energy for nearly all life on earth
      • green plants and algae us a small % of the light energy from the sun to make food during photosynthesis
        • material and energy are also lost from the food chain in the organisms waste materials
          • this explains why you hardly ever get food chains with more than about 5 trophic levels
      • respiration supplies the energy for all life processes including movement
        • most of the energy is lost to the surroundings as heat
    • living things are made of materials theytake from the world around them
      • plants take elements like carbon,oxygen, hydrogen and nitrogen from the soil or the air
        • they turn these elements into complex compounds that make up living organisms - these then pass throught the food chain
          • these elements are returned to the environment in waste products produced by the organisms or when the organisms die
            • micro-orgnisms work best in warm moist condidtions
              • many of them break down material faster when theres plenty of oxygen available
                • all the important elements are recycled returning to the soil to be used by new plants and back in the food chain again


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