Ecosystems Pretest

• The number of mice will increase.

• The amount of green plants rabbits eat will increase.

• The population of foxes and owls will increase.

• The number of green plants will decrease.

• The diagram shows part of a food web in a Great Lakes ecosystem. 

• Competition among humans, alewife, and smelt decreases food availability for bald eagles. 

• Humans decrease the populations of phytoplankton and zooplankton by consuming chinook salmon. 

• Human consumption of coho salmon and chinook salmon may reduce food sources for herring gulls. 

Plants are an important part of an ecosystem.Which role do plants play in the flow of energy within an ecosystem?​

• Consumers

• Decomposers

• Herbivores

• Producers

Select the two statements that explain the role of plants in an ecosystem.

• Plants absorb energy from water and minerals in the ground.

• Plants perform photosynthesis and provide the energy to the ecosystem.

• Plants make most of their energy during the night so that they can use it during the day.

• Plants make most of their energy by breaking down food that is produced by other organisms.

• Plants are organisms that convert the sun’s energy into food used for growth and development.

Choose the omnivore in this diagram

• Caterpillar

• Mouse

• Snake

• Sparrow

​What type of organism is the egret in the food chain?​ 

• carnivore

• decomposer

• herbivore

• producer

Which of these is a food chain in the food web?

• squid—phytoplankton—zooplankton—krill

• zooplankton—cod—leopard seal—penguin

• phytoplankton—cod—leopard seal—killer whale

• penguin—leopard seal—killer whale—elephant seal

What are the producers in the food web?

• the heron and the hawk

• the grasses

• the moth and the mosquito

• the deer and insects

Where does the bat in this food web get its energy?

• from the dragonfly, the moth, and the mosquito

• from the cattails and the grass

• from the hawk and the heron

• form the sun

Which of the animals is an herbivore?

• Barredowl

• Goldfinch

• Fieldmouse

• Ratsnake