Food Chains and Food Webs Explained
Presentation
•
Science
•
7th Grade
•
Hard
Joseph Anderson
FREE Resource
9 Slides • 15 Questions
1
Food Webs and Ecosystems
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Food Webs Review
Food webs are made up of connected Food Chains
Arrows show the direction that energy flows
More energy can be found with the producers
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Energy Pyramids Review
Producers are the foundation for energy pyramids, food chains, and food webs
Producers get their energy from the sun
As you move up the energy pyramid, energy decreases
As energy decreases, so does the amount of life found there (biomass)
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Multiple Choice
What would happen if there were no thrush in the model above?
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Multiple Choice
The model above is an example of a ...
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Multiple Choice
The model above is an example of a ..
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Multiple Choice
What is the producer in the picture above?
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Levels of Organization and Food Webs
Organism - a single member of a particular species
Population - multiple members of that species found in a particular area
A zebra population is pictured
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Multiple Choice
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Multiple Choice
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Multiple Choice
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Multiple Choice
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Multiple Choice
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Ecosystems are the interaction of living and nonliving things
Abiotic factors - are those that are nonliving
Biotic factors - those that are living
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Multiple Choice
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Multiple Choice
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Multiple Choice
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Food Webs Occur in 3 Major Types of Ecosystems
Type 1 - Marine
Marine ecosystems are Salt water ecosystems
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Food Webs Occur in 3 Major Types of Ecosystems
Type 2 - Freshwater Ecosystems
Freshwater ecosystems include streams, lakes, rivers, ponds
If it is water based and the water lacks salt, it is freshwater
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Food Webs Occur in 3 Major Types of Ecosystems
Type 3 - Terrestrial Ecosystems
Terrestrial ecosystems are all land based
If it has land, it's terrestrial
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Multiple Choice
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Multiple Choice
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Multiple Choice
Food Webs and Ecosystems
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