Principles of Ecology

All the organisms that provide the energy for consumers are called (select all that apply):

• detritivores

• producers

• decomposers

• heterotrophs

• autotrophs

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Match the correct definition to the term

• Graphic showing energy moving up levels

• food web

• Act of hunting another organism

• food chain

• Graphic showing many lines of consumers

• competition

• Graphic showing single line of consumers

• energy pyramid

• Act of fighting for resources

• predation

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Several squirrels live in my backyard. My backyard is their:

• habitat
• ecosystem
• environment

• niche

White-tailed deer are native and common in the Midwest. The plains in the Midwest are the deer's:

• environment

• habitat
• niche

• ecosystem

In the woods, there are ducks and mice. They both eat grasshoppers as the only source of food in that area at that time. This is an example of:

• Predation

• Commensalism

• Competition

• Mutualism

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Barnacles are animals that cannot move very far or quickly. In order to get food, they attach to whales and catch any floating plankton in the water. The whale is not hurt but also not helped by the barnacles. What type of interaction is this?

• Mutualism

• Commensalism

• Parasitism

• Competition

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In the wild, some alligators gets their teeth cleaned by birds. The birds gets their food from the alligators' teeth. What type of interaction is this?

• Mutualism

• Commensalism

• Parasitism

• Predation

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In this photo, what is an abiotic factor?

• Deer

• Grass

• Rain

• Trees

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Beavers build dams in streams and rivers. This increases the biodiversity in the area. What is this describing?

• It is describing natural selection.

• It is describing direct competition between individual beavers.

• It is describing abiotic factors of the freshwater habitat.

• It is describing the niche of beavers.

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What are the two main factors of an ecosystem?

• habitats and niches

• biotic and abiotic

• producers and consumers
• heterotrophs and autotrophs

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