Ecology and Population Dynamics

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

• A. The foxes will eat more wolves.

• B. The foxes will eat fewer wolves.

• C. There will be more foxes and wolves.

• D. There will be fewer foxes and wolves.

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The picture below shows an ocean bay food chain. Sea otters move into the ocean bay. They eat all the sea urchins. This change will cause the

• kelp to have less food.

• crabs to have more food.

• sea ducks to have less food.

• arctic foxes to have more food.

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Which model correctly shows energy flow in a food chain?

• plants--> insects--> salmon-->bears

• insects--> plants--> bears--> salmon

• bears--> salmon--> insects--> plants

• salmon-->bears-->plants-->insects

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A marine food web is shown in the diagram below. Which organism below belongs in level 3 of this marine food web?

• krill

• plankton

• scallop

• dogfish

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Which of the following would most likely occur to the populations within the community of organisms immediately after a wildfire burns the environment?

• Top predators would increase and snakes would increase.

• Top predators would decrease and tertiary consumers would increase.

• Meadow plants would increase and rabbits would decrease.

• Meadow plants would decrease and rabbits would decrease.

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Which statement best describes what will happen if the population of herbivores in the community decreases?

• The population of foxes will increase.

• The population of hawks will increase.

• The population of rabbits will increase.

• The population of meadow plants will increase.

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Which statement best describes the flow of energy as it passes through the organisms in the pyramid?

• A. Energy flows through the organisms from bottom to top and increases at each level.

• B. Energy flows through the organisms from bottom to top and decreases at each level.

• C. Energy flows through the organisms from top to bottom and increases at each level.

• D. Energy flows through the organisms from top to bottom and decreases at each level.

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The diagram below shows a simple food web. Which animal is classified as an omnivore?

• red fox

• squirrel

• bird

• eagle

Which of the following animals might compete with the coyote in this food chain?

• Deer

• Rabbit

• Hawk

• Bird

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Decomposers are important in the food chain because they

• produce their own food using light from the Sun.

• stop the flow of energy from one organism to another.

• break down dead organisms and recycle nutrients into the soil.

• are microscopic and other organisms cannot consume them.

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