Biomass and Energy Transfer and Decay

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  • Pyramids of Biomass and Energy transfer and Decay
    • Constructing pyramids of biomass
      • Biomass means the mass of a living material
        • Represented in each bar
      • Less energy and less biomass every time you move up a trophic level
      • Big bar at the bottom is always the producer, next bar the primary consumer, then the secondary consumer etc
    • Interpreting pyramids of biomass
      • Explain what the pyramid shows about the food chain
      • Biomass and energy are still decreasing as you go up the levels
    • Energy Transfer
      • Sun is a source of energy for nearly all life on earth
        • Green plants and algae use small % to make food during photosynthesis
      • Green plants and algae use small % to make food during photosynthesis
      • Respiration supplies all life processes including movement
      • Eventually most of energy lost to surroundings as heat
      • Some material in plants and animals (bones) don't pass on to the next stage
      • Material and energy are also lost from the food chain in the waste materials
      • Loss of energy is why we get pyramids of biomass
    • Decay
      • Plants take in carbon, oxygen, hydrogen and nitrogen and turn these into complex compounds- through food chain
        • Returned to envrion. as waste products
          • Materials decay as they are digested by microorganisms
            • Work best in warm, moist conditions with plenty of oxygen- compost bins= ideal conditions
              • Important elements are recycled and returned back to the soil, ready to be used by plants again


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