Food Webs and Changes to the Environment

The food web below shows some of the feeding relationships among organisms in Arctic waters.

Which organism would be least affected by overfishing for cod in Arctic waters?

• seals

• shrimp

• baleen whales

• toothed whales

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This global food web shows how parts of a meadow ecosystem interact with parts of a marsh ecosystem.

Which of these is a food chain that is part of the global food web?

• meadow grass → rabbit → fox → hawk

• marsh grass → snail → small fish → hawk

• marsh grass → grasshopper → mouse → fox

• meadow grass → grasshopper → praying mantis → small fish

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A student researching a northern forest ecosystem learns the following information about feeding relationships in the ecosystem.

Which food web best represents the flow of energy in these feeding relationships?

• 
• 
• 
• 

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What are food webs?

• They are made up of many food chains joined together and interconnected.

• They are only plants

• They are only animals

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What does this picture represent?

• Animals

• Plants

• A food chain

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Some changes that can disrupt the balance of an ecosystem are:

• fires burning during vegetation

• people cutting down forests to build neighborhoods

• droughts taking away the source of water

• all of the above

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_____ are models that illustrate the energy flow between organisms in an ecosystem.

• Food webs

• Environments

• Ecosystems

• Interactions

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________ species are important to ecosystems and many ecosystems would collapse without them.

• Keystone

• Extinct

• Wild

• Living

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Which of the following best describes a food web?

• A network of interconnected food chains in an ecosystem

• A linear sequence of organisms where each is eaten by the next

• A diagram showing the energy flow in a single food chain

• A chart of the population sizes of different species

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What is the primary source of energy for most food webs?

• The Sun

• Chemical reactions

• Heat from the Earth's core

• Wind energy

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