Ecosystem

When the predator population in an ecosystem decreases, which will most likely happen to the prey population?

• The prey population will die out

• The prey population will decrease.

• The prey population will gradually increase.

• The prey population will move to another ecosystem.

Which best explains how producers make their own food?

• Producers receive energy from rain and use it to produce water for their food.

• Producers receive energy from rain and use it to produce gases for their food.

• Producers receive energy from the sun and use it to produce water for their food.

• Producers receive energy from the sun and produce sugars for their food.

Which comparison of ecosystems is true?

• Tundras are warmer than grasslands.

• Temperate forest has more rain than deserts.

• Deserts have more plants than rainforests.

• Rainforests are rockier than tundras.

Bacteria are released into the Gulf of Mexico to help clean up an oil spill. What role do the bacteria serve in the marine ecosystem?

• decomposers

• consumers

• producers

• predators

More than 17,000 species live on the floor of the deep ocean. Which BEST describes most of the organisms that live there?

• They can survive low salinity.

• They can survive strong waves.

• They can survive high pressure.

• They can survive high temperatures.

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

• 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.

An owl gets its energy from a field mouse it eats. From which food source did the mouse most likely get its energy?

• soil

• water

• sun

• grass

Which type of organism eats only plants?

• carnivore

• herbivore

• producer

• decomposer

Based on this image, what does the Brook Trout eat?

• Algae

• Kingfisher

• Mayfly Nymph

• Flay Larva, Mayfly, and Stonefly Numph

An ecologist is comparing two different ecosystems and creates the following list of similarities:

• aquatic
• diverse fish life
• high salt concentration plentiful light at the water’s surface

Which two ecosystems was the ecologist most likely comparing?

• ocean and lake

• estuary and ocean

• grassland and pond

• desert and ocean