Ecosystems Test 4

Which marine ecosystem would be best for organisms that can adapt to both salt water and fresh water?

• estuary

• lake

• pond

• river

What is the main difference between marine and freshwater ecosystems?

• the amount of animals

• the amount of plants

• the amount of rocks

• the amount of salt

Which ecosystem would most likely contain fish that can only survive in freshwater?

• lake

• ocean

• estuary

Which area is coldest?

• rainforest

• grassland

• tundra

• reef

The diagram above shows part of a lake food web. Many tourists and locals have been fishing in the same spot in this lake for a long period of time. How will the organisms in this food web MOST likely be affected if this fishing continues?

• The frog population will have fewer dragonflies to eat.

• The dragonfly population will have more beetles to eat.

• The pelican population will have less herring to eat.

• The mayfly population will have less algae to eat.

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The picture shows a polar bear. Which change in the environment would MOST likely decrease the ability of this animal to survive?

• increase in Earth’s temperature

• decrease in Earth’s temperature

• increase in yearly rainfall

• decrease in yearly rainfall

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Marco caught a blue crab while he was at the beach with his family. He wanted to take it home and place it in his pond, but was told the crab would not survive. What is the MOST likely reason the crab needs the ocean to survive?

• There is more sunlight.

• There are fewer predators.

• The crab needs less oxygen.

• The crab needs the salt water.

Which two organisms in the food chain shown below are carnivorous?

• grass and mice

• mice and snakes

• hawks and grass

• snakes and hawks

An energy pyramid shows that less food and energy is available moving from the bottom to the top. Based on this model, where would producers be located on the energy pyramid?

• Level 1

• Level 2

• Level 3

• Level 4

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Which will most likely cause a decrease in predator populations?

• an increase in prey populations

• a decrease in prey populations

• a decrease in decomposers

• an increase in producers

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