Changes in Ecosystems

From 1965 to 1970, which pattern did scientists observe?

• A drop in wolf population and a drop in moose population

• An increase in wolf population and a drop in moose population

• A drop in wolf population and in an increase in moose population

• An increase in wolf population and an increase in moose population

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

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

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

Tags

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

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which of the following BEST describes the change in the size of populations in an ecosystem over time?

• Population numbers are stable over centuries

• Population numbers change each month

• Population numbers change noticeably on a day-to-day basis

• Population numbers normally change with the seasons

Tags

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

Why would algae grow in a lake?

• because the lake is polluted

• because the lake is a newly created ecosystem

• because there are a lot of fish in the lake

• because a natural disaster destroyed the lake

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS2-4

What is the purpose of succession?

• to put an end to the creation of new ecosystems

• to form a complete ecosystem

• to have ecosystem that last no longer than 2 years

• to eliminate the need for conservation

What is it called when changes occur in an ecosystem that already exists?

• primary succession

• secondary succession

• conservation

• pollution

Which of the following is a natural disaster that could wipe out an ecosystem?

• a sunny day

• a rain storm

• a forest fire

• an oil spill

Tags

NGSS.MS-ESS3-2

NGSS.MS-LS2-4