Population Dynamics and Extinction

We know that population sizes change over time. All statement(s) are true about this change EXCEPT:

• When there are more births than deaths the population size will increase.

• When there are more deaths than births the population size will decrease.

• When there are more deaths than births the population size will increase.

• When there are more births than deaths the population size will decrease.

• There is more than one exception.

All of the following are factors that affect a population's size EXCEPT:

• Availability of resources

• Predator / prey relationships

• Changes in the environment

• Reproductive success

• No exceptions - all statements are true

The wolf population on Isle Royale is presently very low despite the fact that the moose population is high. What statement best represents what this might indicate?

• Wolves don't eat moose.

• The moose population has no affect on the wolf population.

• There must be other factors besides availability of food that are affecting the wolf population

• Wolves are unpredictable and so are their population sizes

• Moose have killed off the wolves

Death rates in a population, such as the moose on Isle Royale, can be affected by all of the following EXCEPT:

• Availability of food

• Individual fertility

• Predators

• Disease

• No exceptions - All of these factors affect death rates

Birth rates in a population, such as the moose on Isle Royale, can be affected by all of the following EXCEPT:

• Availability of food

• Availability of mates

• Health of the mother

• Changes in the environment

• No exceptions - All of these factors affect birth rates.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Humans are the only factor influencing extinction rates.

• True

• False

Tags

NGSS.HS-LS2-7

NGSS.HS-LS4-5

Over geologic time, biodiversity has increased exponentially.

• True

• False

Present day extinctions are happening at the greatest rate on islands. All of the following statements are reasons for this EXCEPT:

• islands are isolated from humans

• invasive species have been brought to islands by humans

• Islands have smaller population sizes so they are more impacted by changes.

• There is less space on islands so species have to compete more with each other.

• No exceptions - all statements are true.

Tags

NGSS.MS-LS2-4

Review the graph provided. What statements can be made about the significant decline in wolves around 1979?

• The wolf decline was a direct result of moose decline.

• The is no way to know why the wolf population dropped.

• The drop is most likely due to the declining moose population, but more information would be needed to determine that.

• The drop is most likely due to the increasing moose population, but more information would be needed to determine that.

• The wolf decline was a direct result of the moose increase.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Use the graph provided to decide if the following statement is true or false: The wolf population on Isle Royale is rather unstable throughout this time period.

• True

• False

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4