Interdependence and Competition

The number of organisms an environment can support depends on the availability of environmental resources. Changes in the mule deer population in Nevada from 1900–2000 are shown in the graph.

During which years did the mule deer population most likely experience the greatest decrease of environmental resources?

• 1930–1950

• 1956–1960

• 1960–1970

• 1976–1980

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

In the early 1900s, an e ort was made to protect the deer population that lived on the Kaibab Plateau in Arizona. Over 6200 predators of the deer were hunted. The best explanation for the increase in the deer population on the Kaibab Plateau is that the deer had...

• less exposure to diseases

• a more favorable climate

• an unlimited food supply

• fewer natural enemies

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which event explains what most likely happened at the beginning of month 3?

• More predators of species  X were introduced.

• The prey of species X decreased in number.

• A disease that affected species X was introduced.

• A competitor of species X decreased in number.

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

The picture below shows the energy flow through a meadow community.

Which of the following would most likely occur to the populations within the community of organisms immediately after a wildfire burns the environment?

• Hawks would increase and foxes would increase.

• Hawks would decrease and foxes would increase.

• Meadow plants would increase and rabbits would decrease.

• Meadow plants would decrease and rabbits would decrease.

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NGSS.MS-LS2-1

NGSS.MS-LS2-3

NGSS.MS-LS2-4

A __________________ relationship is when a biotic or abiotic factor is needed by an a living thing to surive

• Dependent

• Competitive

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NGSS.MS-LS2-1

Use this data table to answer the question. A scientist examined the numbers of two different species of insects on four different kinds of trees in the same forest. The results of her examination are shown on the data table. What inference can the scientist make about the insects?

• Species B insects are the main food source for species A insects.

• Species A and species B insects are very closely related.

• There are more of species B insects than species A insects in the entire forest.

• Species A insects prefer different kinds of trees from species B insects.

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

A condition that occurs when two or more organisms compete for the same resources or food within an ecological community

• Population

• Competition

• Ecosystem

• Community

A lichen is a combination of two organisms, an alga and a fungus. The fungus gets its food from the alga while the alga gets water from the fungus. This is an example of which relationship?

• competition

• mutualism

• commensalism

• parasitism

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NGSS.MS-LS2-2

Which organism provides energy to all other organisms in this ecosystem?

• prairie dog

• prairie grass

• vulture

• coyote

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NGSS.MS-LS1-6

Which choice is likely to result in the most competition?

• organisms that live in different ecosystems

• organisms that use the same resource

• organisms that live in the same area

• organisms that are classified in the same phylum

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NGSS.MS-LS2-1