Unit 3

• Ecosystem


  A unit in nature in which living and non-living things interact with each other
• Biotic factors


  Living organisms
• Abiotic factors


  Non-living factors important for living organisms, for example water and light
• Requirements that living organisms need to survive

  • Food
  • Water
  • Air
  • Warmth
• Ecosystems can vary in size from very small, for example a puddle of water, to large, for example the Sahara Desert
• Components of an ecosystem

  • Living component
  • Non-living component
• Living components of an ecosystem

  Biotic factors
• Non-living components of an ecosystem

  Abiotic factors
• Biotic factors in ecosystems

  • Plants
  • Animals
  • Microorganisms
• Abiotic factors in ecosystems

  • Light
  • Water
  • Soil
  • Air
  • Temperature
• Physiographic factors


  • Height above sea level
  • Slope of the land