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Science 7 Topic #4. How Organisms Interact. Biotic vs Abiotic. Biotic Living parts of an ecosystem Ex. Humans, bacteria, insects, plants, etc Abiotic Non-living parts of an ecosystem Ex. Air, water, soil, sun , minerals. The Roles of Organisms in an Ecosystem. Niche:

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science 7 topic 4

Science 7 Topic #4

How Organisms Interact

biotic vs abiotic
Biotic vsAbiotic
  • Biotic
    • Living parts of an ecosystem
      • Ex. Humans, bacteria, insects, plants, etc
  • Abiotic
    • Non-living parts of an ecosystem
      • Ex. Air, water, soil, sun , minerals
the roles of organisms in an ecosystem
The Roles of Organisms in an Ecosystem
  • Niche:
    • The role of an organism within its ecosystem that allows that ecosystem to survive and function efficiently
    • Can help explain why organisms act and interact as they do
    • Must look at what it eats, where it lives, and how it interacts with other organisms in its ecosystem
    • Are able to make their own food
  • Consumers
    • All organisms that consume/eat producers or other organisms to obtain their energy
      • 3 types
        • Herbivores: eats plants
        • Carnivores (predators/prey): eats meat
        • Omnivores: eats both meat/plants
food chains
Food Chains
  • A model that shows how energy stored in food passes from organism
  • Always starts with the SUN
    • Even though an animal eats a plant to obtain their energy they still rely on the Sun indirectly
  • Energy flow
    • The movement of energy, starting from the Sun, and passing from one organism to the next
    • Only 10 percent of energy is transferred to the next individual
food webs
Food Webs
  • Network of interconnected food chains
    • Can be large and complicated
pyramid of numbers
Pyramid of Numbers
  • The number of individual organisms at each level of a food chain; the number of organisms decreases with each level higher in the food chain
    • There is a greater number of organisms at the bottom of the food chain than at the top
  • Does not indicate how much energy is consumed
    • Biomass
      • The total mass of all the organisms in an ecosystem
the clean up squads
The Clean-Up Squads
  • Scavengers
    • Organisms that feed on dead or decaying plant or animal matter
      • Eat the dead material and break down the large carcasses into smaller pieces during digestion
  • Decomposers
    • Do not actually eat dead material
    • Grow in or on the dead/waste material