Principles of Ecology

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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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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Which trophic level organisms are often left off of food chains?

• herbivores

• decomposers

• quaternary consumers

• secondary producers

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An organism that eats what carnivores and scavengers leave behind is a(n):

• herbivore

• carnivore

• decomposer

• omnivore

A bear eating salmon from a stream describes:

• Predation

• Competition

• Symbiosis

• Parasitism

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Termites eat lumber and are a pest in homes. This interaction is best described as:

• predators

• parasites

• producers

• decomposers

In this energy pyramid which type of consumer(s) gets only 10% of the energy stored in plants?

• Herbivores and omnivores

• Herbivores and carnivores

• Just omnivores

• Just herbivores

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Which one is not a primary consumer in a plains ecosystem?

• deer

• rabbits

• grasshoppers

• maggots

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