5th Grade Ecosystems Review

The diagram shows a marine food web. Changing Ocean temperatures have led to a large decrease in the number of horseshoe crabs. Which effect will MOST likely occur next?

• The diamondback turtle and grackle population will decrease

• The striped bass and plankton populations will decrease.

• The razor clam population will increase.

• The sanderling population will increase.

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Noah visited a park that had many oak trees. Which BEST describes the role of an oak tree in its ecosystem?

• Oak trees can live for a long time.

• Oak trees have leaves that change colors.

• Oak Trees have strong branches and trunks.

• Oak trees are a source of food and shelter for animals.

Which food chain is shown correctly?

• 
• 
• 

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Which change would most likely reduce the number of both large roach fish and steelhead fish?

• An increase in the amount of algae

• an increase in the amount of small invertebrates

• a decrease in the number of predatory invertebrates

• a decrease in the number of young stickleback fish

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The number of Florida Scrub jays have recently been decreasing throughout Florida. Which is the MOST likely reason for smaller populations?

• habitat loss

• fewer predators

• more eggs hatching

• new food sources available

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High average daily temperatures and heavy annual precipitation are found in a...

• desert

• grassland

• rainforest

• tundra

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Wood ducks build their nests in holes in trees near lakes. If some of the trees were removed from around the lake, how would the wood ducks be affected?

• Wood ducks would become a new species.

• Wood ducks would lay more eggs in each nests

• Wood ducks would increase their competition for nests.

• Wood ducks would begin building their nests on the ground.

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Which organisms are most likely to be found in both a pond and a lake ecosystem?

• algae, fish, insects

• fungi, trees, squirrels

• zebras, giraffes, insects

• plankton, fish, crocodiles

Why are more types of organisms found in the shallow part of the ocean than in very deep ocean water?

• There is more salt

• There is more light

• There is more sand

• There is more wave action

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Which best explains how shallow parts of the ocean and estuaries are similar?

• They are both affected by wave action.

• They are both affected by deep ocean currrents.

• They both have abundant plant life due to plenty of sunlight.

• They both have a mix of freshwater and salt water due to rivers.