Unit 3B Final Exam Review Ecological Models

What does a food web represent?

• All connections of energy flow throughout all organisms in a habitat.
• The specific ways that mutualism is carried out.
• A single pathway or energy flow between organisms. 
• How carnivores get their food. 

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Why might an organism have more than one arrow coming from them in a food web?

• More than one organism may eat them. 
• They may eat more than one other organism. 
• This organism gets its energy from multiple sources. 
• They have no resources available to them.

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An organism that needs to eat other organisms to obtain energy is known as a:

• Autotroph

• Producer

• Heterotroph

• Mutualist

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A diagram that shows the transfer of energy in one line is a...

• food web
• food chain
• food line
• food court

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What is a herbivore?

• an animal that gets energy from eating other animals
• an organism that gets energy from eating only plants
• an animal that gets energy by eating both plants and other animals
• an animal that eats only herbs

What do the arrows in the food chain indicate about the flow of energy in an ecosystem?

• Energy is continuously recycled by the organisms in an ecosystem.

• Energy flows in one direction in an ecosystem, from producers to consumers.

• More of the available energy in an ecosystem is given to large animals than to small animals.

• Organisms at the end of the food chain receive more energy than those at the beginning.

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In this energy pyramid, which organism would most likely be in level 2?

• bird

• fox

• caterpillar

• tree

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How would the removal of earthworms from the food chain affect the other organisms?

• The number of bass will increase.

• The number of crayfish will decrease.

• The crayfish will get their energy directly from the sun.

• The number of bass and ospreys (bird) will increase.

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The diagram shows part of an aquatic food web for a stable lake ecosystem in Connecticut. What is the source of energy for the algae?

• waves

• sunlight

• bacteria

• rotifers, water fleas and tadpoles

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The picture shows an energy pyramid. What will most likely happen to the foxes and the wolves if the rabbits are removed?

• The foxes will eat more wolves.

• The foxes will eat fewer wolves.

• There will be more foxes and wolves.

• There will be fewer foxes and wolves.

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