Food Chains Roles of Organisms

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Food ChainsRoles of Organisms

• 4th Grade Science

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Community works as a team

• A community is made up of all the living and
  non-living parts of an ecosystem.
• A community works as a team.
• Each member of the team has a job to do. An
  organisms role is its niche.
• There are three types of team members.
• Producer
• Consumer
• Decomposer

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Power for the ecosystems

• The sun is the power plant for ecosystems.
• No ecosystem could survive without the suns
  energy.

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Producers

• Producers make the food for the ecosystem.
• Plants make their own food.
• To make food, producers use water, carbon dioxide
  in the air, and the Suns energy. This is called
  photosynthesis.

• Producers make the food for the ecosystem.
• Plants make their own food.
• To make food, producers use water, carbon dioxide
  in the air, and the Suns energy. This is called
  photosynthesis.

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Producers affect their environment

• Producers provide shelter to animals.
• Producers keep soil from eroding.
• Producers contribute to the air that we breathe
  by taking in carbon dioxide and releasing oxygen.

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Consumers

• Organisms that eat food are consumers.
• Consumers cannot make their own food.
• Animals and insects are consumers.
• Consumers may eat plants or other consumers.

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Three types of consumers

• There are three main types of consumers.
• Herbivores consumers that eat only plants
• Carnivores consumers that eat only animals
• Omnivores consumers that eat plants and animals

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Decomposers

• Decomposers break down living and dead matter
  into simple chemical that they use for food.
• Producers use these chemicals or nutrients in the
  soil for making food.
• F. B. I.
• Fungus
• Bacteria
• Insects

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Food Chains

• The Sun is the beginning of all food chains.
• A food chain is the steps in which organisms get
  the food they need to survive.
• A food chain shows how energy is passed from one
  organism to another.
• Producers make their own food.
• Consumers and decomposers must get food from
  producers or other consumers.

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Food Chains
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Food Webs

• Food chains show how energy is passed from the
  Sun to producers, consumers, and decomposers.
• In a ecosystem many food chains overlap.
• Several consumers may all eat the same kind of
  plant or animal. This is a food web.
• A food web shows how many food chains are related
  within an ecosystem.

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Food Web

• 1. What consumers are found in several food
  chains? What food chains is it a part of?
• 2. What might happen to this food web if the
  hawk dies?

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Energy Pyramids

• Shows how much energy is passed from one organism
  to the next in a food chain
• Producers are at the bottom, biggest level of the
  pyramid. There are more of them.
• At each level, 10 of energy is passed on, while
  90 is used.
• Only one or two consumers are at the top of the
  pyramid.

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Questions

• How do food chains and food webs relate?
• Could an ecosystem exist without producers?
  Consumers? Decomposers? Explain