Interactions in an Ecosystem

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It is common to see wild animals like deer and coyotes in large cities and neighborhoods. Which is most likely a reason the animals are found in these areas? *

1 point

They prefer to be near houses.

They prefer to be near people.

Their habitat is increasing in size.

Their habitat is decreasing in size.

A developer buys land on a wooded mountain to build hotels for people visiting a new winter sports center. How will this most likely affect birds living in the area? *

1 point

Birds will become completely dependent on humans for food and water.

Birds will have more places to build nests as more trees will be planted.

Population diversity and the number of birds will increase as more food and water resources become available.

Population diversity and the number of birds will decrease as fewer food and water resources become available.

Which will most likely happen to the grasshopper population if the grass population decreases? *

1 point

The grasshopper population will increase because there will be less competition.

The grasshopper population will decrease because there will be less food available.

The grasshopper population will increase because there will be more food available.

The grasshopper population will decrease because there will be an increase in the predator population.

The main source of food for a coyote population in one area is mice. Which is most likely to happen to these coyotes if a new predator begins eating the mice? *

1 point

There will be fewer coyotes.

The coyotes will produce more young.

More coyotes will arrive from other locations.

Each coyote will spend less time hunting food.

Which best describes the result if the number of lily pads in a pond ecosystem increases? *

1 point

Consumers of the lily pads would increase because of a larger food source.

The lily pads would prevent fish from absorbing the sun’s energy.

Consumers of the lilypads would decrease because of increased competition.

The lilypads would use the oxygen in the air, which would lower the number of consumers.

In a grassland ecosystem, lions prey on wildebeest. The population of wildebeest has declined steadily because of hunting. What will most likely happen to the lion population? *

1 point

The lion population will increase.

The lion population will decrease.

The lion population will remain the same.

What will most likely happen to this food chain if a farmer decides to dust a wheat crop with an insecticide? wheat → insects → sparrows → hawks *

1 point

The grass would become greener.

More birds would move into the fields.

The hawks would eat more of the grass.

There would be fewer sparrows seen in the fields.

In a food chain, foxes are consumers of rabbits and mice. If the mice population suddenly decreases, what will most likely happen to the number of foxes? *

1 point

The number of foxes will increase because they will eat fewer rabbits.

The number of foxes will stay the same because they will eat more rabbits.

The number of foxes will decrease because they will be eaten by the rabbits.

The number of foxes will decrease because they will only have one remaining food source.

One year, the oak trees in a park began producing more acorns than usual. The next year, the population of chipmunks in the park also increased. Which best explains why there were more chipmunks the next year? *

1 point

Shady areas increased.

Food sources increased.

Oxygen levels increased.

Available water increased.

Bald eagles were once in danger of extinction. Since being protected by laws, the bald eagle population has grown. Bald eagles eat a variety of organisms including snakes. How did the increase in the population of bald eagles most likely affect snakes living in eagle habitats? *

1 point

The increase reduced the number of snakes.

The increase forced the snakes to change habitats.

The increase made the snakes find new food sources.

The increase caused the snakes to develop new traits.

What would happen if the snakes were taken out of this food chain? Clover → Grasshopper → Frog → Snake → Owl *

1 point

Frogs would increase.

Frogs would decrease.

Grasshoppers would decrease.

Owls would increase.

A simple food web is shown.

Which population would most likely increase if the crayfish population decreased? *

1 point

hawk

mink

fish

snail

Look at the food chain below. Leaf → Cricket → Frog → Garter snake → Skunk What would most likely cause the number of garter snakes to decrease? *

1 point

more leaves

more crickets

more frogs

more skunks

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