Ecological Relationships and Food Webs Worksheet

Which of the following receives its energy directly from a secondary consumer?

• Owls

• Foxes

• Rabbits

• Grasses

What would happen if more birds moved into the environment?

• The number of mice would go up

• The number of grasshoppers would go up

• The number of grasses would go up

• The number of foxes would go up

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The bird in the food web is both a ___________ consumer and a ____________ consumer. (HINT: COUNT THE ARROWS)

• Primary

• Secondary

• Tertiary

• Quaternary

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Choose the ecological relationship represented by the following example: A mole digs an underground tunnel system for its habitat. A snake shelters in the mole’s tunnel when the weather is too hot to protect itself from drying out. The mole receives no benefit or harm from the snake that invades its tunnel, even when it can do very little to make the snake go away.

• Predation

• Commensalism

• Mutualism

• Parasitism

Choose the ecological relationship represented by the following example: A hawk hunts and captures a sea turtle on the beach that is trying to make it to the ocean. The hawk eats the sea turtle.

• Predation

• Commensalism

• Parasitism

• Competition

Choose the ecological relationship represented by the following example: Two species of spider, Brown Recluse and Wolf Spider, live on Bottle Palm Trees in the Port St Lucie area. Both types of spiders eat exclusively ants. The Wolf Spider is territorial and is usually held responsible for the shrinking population of the Brown Recluse.

• Predation

• Commensalism

• Mutualism

• Competition

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Choose the ecological relationship represented by the following example: Clonorchis sinensis is a parasitic worm that can get inside the skin of fish. When fish-eating mammals consume an infected fish, the liver parasite is spread. It feeds on bile in the gallbladder to get nutrients, resulting in gallbladder cancer and infections over time.

• Predation

• Commensalism

• Mutualism

• Parasitism

Choose the ecological relationship represented by the following example: The acacia tree provides shelter to acacia ants in the thorns of their trees. In return, the acacia ants attack herbivores that try to eat the tree’s leaves by stinging them.

• Predation

• Commensalism

• Mutualism

• Parasitism

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Which of the following is NOT a limiting factor for populations?

• Food availability

• Water supply

• Space to live

• Unlimited resources

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River otters are an endangered species that lives in the waters of Florida. Many threats to this species come from human interference. What could conservationists do to reduce the limiting factors and increase the local river otter populations?

• Trap and remove river otters from the ecosystem every year

• Increase the amount of fishing in the area

• Increase the area of habitat available

• Remove laws that regulate industrial pollution

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