Food Chains and Food Webs

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?

• Shady areas increased

• Food sources increased

• Oxygen levels incresaed

• Available water increased

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NGSS.MS-LS2-1

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Plankton are tiny organisms that live in the ocean. Some types of plankton use energy from sunlight to make their own food. Which statement BEST explains the role of plankton in an ocean ecosystem?

• Plankton produce energy for consumers in the ocean.

• Plankton are the top consumers of the ocean food web.

• Plankton decompose organisms and put nutrients back in the ocean.

• Plankton prey on other organisms and keep the ecosystem in balance.

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NGSS.MS-LS1-6

NGSS.MS-LS2-3

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 nest.

• Wood ducks would increase their competition for nests.

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

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NGSS.MS-LS2-1

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Jackie learned that animals compete with each other for resources to stay alive. She studied a food web of organisms that live in a marsh.

Which organisms are competing with each other for the same food source?

• Hawk and Snake

• Cricket and Frog

• Snake and Cricket

• Shrew and Grasshopper

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NGSS.MS-LS2-1

A food web is illustrated.

Which organisms in this food web compete for food?

• rabbit and frog

• frog and insect

• insect and owl

• owl and hawk

The food web shows the energy transfer between organisms in an ecosystem.

How will it MOST likely affect the ecosystem if the population of grass increases?

• The population of trees will increase.

• The population of mice will increase.

• The population of deer will decrease.

• The population of hawks will decrease.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

A simple food web is shown.

Which population would MOST likely increase if the crayfish population decreased?

• hawk

• mink

• fish

• snail

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NGSS.MS-LS2-1

NGSS.MS-LS2-2

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A pond food chain is illustrated.

What would MOST likely happen first if the producer population in this food chain were to decrease?

• The fish population would increase.

• The grass population would increase.

• The number of hawks would decrease.

• The number of grasshoppers would decrease.

Tags

NGSS.MS-LS2-1

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NGSS.MS-LS2-4

Carmine made a food web diagram.

If there were a sudden decrease in the amount of grass, which would be MOST affected?

• the Sun

• the trees

• the rabbits

• the wolves

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

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?

• 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.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4