Changes in Ecosystems

Why does this occur?

• A decrease in the amount of sunlight creates a better environments for plants

• The new sediment causes the original plants in the area to evolve into new species

• The new sediment causes the original plants in the area to become extinct

• The new sediment provides a place for more plants to grow

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NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which environment factor may have contributed to the increase in the rabbit population?

• Decrease in resources

• Decrease in predators

• Increase in disease

• Increase in pollution

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

Borrelia burgdoferri, a bacteria carried by the deer tick, produces Lyme disease in humans as well as dogs and cattle. As the deer population increases in Northern Virginia, it is likely that-

• there will be more reported cases of Lyme disease among humans in the area

• the percentage of deer that carry B. burgdorferri will also increase

• the number of ticks with Lyme disease will increase as well

• the population of deer will be reduced as a result of Lyme disease

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

Farms are typically located along rivers and streams in Virginia. Farmers often use pesticides to keep insects from eating their crops. What impact might this practice have on the aquatic insect population near the farms?

• it may increase the population of aquatic insects

• it may decrease the population of aquatic insects

• it may cause genetic mutations in the population of aquatic insects

• it may diversify the population of aquatic insects

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

NGSS.MS-LS4-4

Nitrogen is essential to all life. Although our air is 79% nitrogen, most organisms cannot use nitrogen in this form. As a result, animals rely upon plants to provide the nitrogen they need to-

• breathe air

• digest food

• excrete wastes

• create proteins

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NGSS.MS-LS2-1

NGSS.MS-LS2-3

NGSS.MS-LS2-4

Which of the following conditions may result in an increase in a specific deer population?

• A longer hunting season

• A warm winter with little snow or ice

• Cutting down trees for wood

• Very little rain

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which statement best describes these two species?

• Species A is a producer and species B is its consumer

• Species A is a host and species B is its parasite

• Species A is a predator and species B is its prey

• Species A is a scavenger and species B is its decomposer

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NGSS.MS-LS2-2

Which of the following statements about the bluegill population is supported by the data shown in this graph?

• An algae bloom reduced dissolved oxygen from 1992 to 1993

• The amount of food increases from 1994 to 1995

• There was a decrease in predators from 1995 to 1996

• Fisherman caught fewer bluegill from 1996 to 1997

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NGSS.MS-LS2-4

What factor most likely led to the decrease in the bird populations shown on the graph?

• Introduction of a new species

• Loss of food source

• Loss of habitat

• Use of pesticides

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NGSS.MS-ESS3-4

NGSS.MS-LS2-1

NGSS.MS-LS2-4

In 2009, Reno, NV had 8 straight days of heavy rain. The rain produced a large crop of berries and other vegetation. The populations of insects and squirrels also increase. Which of the following would be a short-term effect of the rainfall?

• An increase in bear population several months later

• Increases in summer vacation rentals

• Significant changes in the area's climate

• Smaller areas of ground erosion

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4