Changes in Ecosystem

A __________________ _____________________ is the first species to appear after a disaster in an area.

• pioneer species

• primary succession

• keystone species

• secondary succession

When a disaster strikes, such as a volcano erupts, and the area is left with only bare rock, it is called _____________________________ _______________________.

• primary succession

• secondary succession

• natural eutrophication

• biodiversity

A __________________ ____________________ is the species that an ecosystem relies on to keep it strong.

• pioneer species

• native species

• invasive species

• keystone species

Tags

NGSS.MS-LS2-4

___________________________________ happens when too many nutrients get into a body of water and cause algae to grow.

• succession

• eutrophication

• biodiversity

• urbanization

How is secondary succession different from primary succession?

• Secondary succession occurs after a disturbance in an area that was previously uninhabited.

• Secondary succession occurs after a disturbance in an area in which the soil has remained intact.

• Secondary succession occurs over a longer period of time than primary succession.

• Secondary succession occurs when animals are introduced to an area that had only plants.

What will most likely happen to a native species if an exotic species outcompetes it for food?

• The native species will become extinct.

• The native species will adapt to less food.

• The native species will find another food source.

• The native species will use the exotic species for food.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4

How do pioneer species make ecological succession possible on an island formed from volcanic eruptions?

• They use chemicals to produce food.

• They establish homes in which animals can live.

• They break down rock into soil in which plants can grow.

• The adjust the climate by altering the average temperature in a region.

Which of the following might decrease the amount of water available in an ecosystem?

• spilling oil

• dumping sewage

• constructing a dam

• producing acid rain

Tags

NGSS.MS-ESS2-4

NGSS.MS-ESS3-4

The diagram shows changes to a pond ecosystem over time. Through which of the following processes are plant communities taking over the ecosystem?

• acidification

• primary succession

• climate change

• eutrophication

Tags

NGSS.MS-LS2-4

How does an increase in the human population affect ecosystems?

• A larger human population increases Earth's biodiversity.

• A larger human population has a greater need for natural resources.

• A larger human population produces more natural resources for living things.

• A larger human population helps matter cycle through ecosystems more quickly.

Tags

NGSS.MS-ESS3-4