Populations Review

The graph shows the population of gray fox in an area of the United States.

Which best describes the population size between 1990 and 2011?

• mostly stable and unchanged

• many increases and decreases but declined overall

• slowly increased over time

• several sharp declines but grew overall

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

A population of frogs in a pond began with 67 individuals. Over one year, the population changed to 53.

Which are two possible reasons for the change within the frog population?

• emigration or increase in death rate

• emigration or increase in birth rate

• immigration or decrease in death rate

• immigration or increase in birth rate

Tags

NGSS.MS-LS2-4

Which scenario would result in a decrease in population size, or a negative population growth? Use this formula: population growth = (birth rate + immigration) – (death rate + emigration)

• 0 individuals emigrate, 14 individuals die, 14 individuals are born, 14 individuals immigrate

• 40 individuals emigrate, 0 individuals die, 10 individuals are born, 28 individuals immigrate

• 12 individuals emigrate, 5 individuals die, 17 individuals are born, 0 individuals immigrate

• 19 individuals emigrate, 4 individuals die, 25 individuals are born, 0 individuals immigrate

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

During one year, eight turtles are born into a population. Ten turtles immigrate into the population, but two emigrate to find mates. If the overall population growth is nine turtles, what was the death rate of turtles during the year? Use this formula: population growth = (birth rate + immigration) – (death rate + emigration)

• 7

• 9

• 11

• 29

A group of the same type of organisms living in the same place at the same time.

• threatened species

• populations

• abiotic factors

• limiting factor

Tags

NGSS.MS-LS2-1

Which of the following is a population?

• hawks, barred owls, and eagles on NC coast

• a mountain stream

• all the frogs in a pond of different species

• blue-tailed skinks (lizards) around a barn

Members of a species in a defined area

• Ecosystem

• community

• biodiversity

• population

During one year, eight moose in a population died and two moose were born. Three moose immigrated from another population and five emigrated to find mates.

What was the population growth during this year?

Use this formula:

population growth = (birth rate + immigration) – (death rate + emigration)

• -8

• -3

• 2

• 18

During one year, two rabbits were born into a population and five emigrated to look for better food sources. Seven rabbits died in the population and 12 immigrated into the population. What was the population growth during this year? Use this formula: population growth = (birth rate + immigration) – (death rate + emigration)

• -10

• 2

• 7

• 26

Tags

NGSS.MS-LS2-4

During one year a population of blue jays has zero population growth. Which must be true about the blue jay population at the end of the year compared to the beginning of the year?

• It will have the same number of individuals in it.

• It will have the very same individuals in it.

• It will have become larger.

• It will have become smaller.