Science 7 topic 4
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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

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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


Science 7 topic 4

  • Producers

    • 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


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