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Competition for Resources : Food Webs, Energy Flow, Abiotic

Resource used: Discovery Education


  1. producer
  2. energy
  3. consumer
  4. ecosystem
  5. food web
  6. food chain
  7. abiotic
  8. biotic
  9. organism
  10. population
  11. community

Main Questions:

  1. How does energy flow through ecosystems?
  2. Why is food important for organisms?
  3. Why are all organisms connected to each other?
  4. How do organisms and populations depend on biotic and abiotic factors?
  5. How do organisms compete for biotic and abiotic factors?
  6. How do populations compete for biotic and abiotic factors?
  7. Write about how humans can affect biotic and abiotic factors in sand dune or sea turtle ecosystems, noting cause and effect. Based on two articles in your DE assignment folder that we read outloud
  8. 3 diagrams will be on test that you will have to interpret


- 10% Rule

- Flex Flow

- How's for dinner


  1. All Engage and Expolore Videos
  2. Video:Overview of Mammals, Carnivores, Herbivores and Omnivores and Their Role as Consumers in the Food Chain or Web
  3. Video segment: The Food Chain: Predators and Prey

Parts of a Food Chain

Relationships Among Organisms

    How do different organisms in a community obtain energy from their environment?

Answer: Photosynthetic organisms such as plants obtain energy directly from the sun. They are called producers. Herbivores are organisms that take in that energy by eating plants and other photosynthetic organisms. Herbivores are considered primary consumers. Carnivores are organisms that take in energy by eating animals. Carnivores can be secondary and tertiary consumers. Omnivores are animals that eat both plants and animals. Decomposers get energy from dead plants and animals and other organic matter.


    What kinds of relationships exist between organisms in a community?

Answer: Relationships in a community can be cooperative or competitive. Predator/prey relationships and parasite/host relationships are competitive relationships. In a predator/prey relationship, a predator hunts prey for food. In a parasite/host relationship, a parasitic organism feeds on a living host organism in order to survive. Sometimes this kills the host organism. Symbiosis is a kind of cooperative relationship. In symbiotic relationships, organisms work together to obtain energy from their environment, grow, and reproduce.


    Why is the sun an important source of energy for all living things?

Answer: The sun continuously supplies energy into nearly every ecosystem on Earth. Producers store this energy in matter. Energy and matter are transferred from producers to consumers, from consumers to other consumers and to decomposers, and from decomposers to other organisms, in a cycle. In this cycle, matter and energy are conserved. However, much energy is lost into the environment every time an energy transfer between organisms occurs. Energy that is released into the environment can no longer be used by living things. Without the sun, there would be no way to replace energy released into the environment.