Populations L.17.3

In regards to population growth and size, what is the definition of birth rate?

• the number of organisms born into a population in a specific period of time

• the movement of organisms into a population

• the number of organisms that die in a population in a specific period of time

• the movement of organisms out of a population

In regards to population size and growth, what is the definition of emigration?

• the number of organisms born into a population in a specific period of time

• the movement of organisms into a population

• the number of organisms that die in a population in a specific period of time

• the movement of organisms out of a population

In regards to population size and growth, what is the definition of immigration?

• the number of organisms born into a population in a specific period of time

• the movement of organisms into a population

• the number of organisms that die in a population in a specific period of time

• the movement of organisms out of a population

In regards to population size and growth, what is the definition of death rate?

• the number of organisms born into a population in a specific period of time

• the movement of organisms into a population

• the number of organisms that die in a population in a specific period of time

• the movement of organisms out of a population

During one year, seven coyotes in a population die and 12 are born. Eight coyotes immigrate into the population, but none emigrate. Is the population of coyotes growing, shrinking, or remaining the same?

Use this formula:

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

• growing

• shrinking

• remaining the same

Which scenario below best describes carrying capacity of an ecosystem?

• A vegetable garden is six feet long and 10 feet wide

• Over 1,500 species of birds live in a tropical rain forest

• About 500 fish in part of a river died as a result of water pollution

• An area of a desert can support a population of 320 cactus plants

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 shrinking

• -3 shrinking

• 2 growing

• 18 growing

What is the definition of carrying capacity?

• the maximum population that a given area can support

• parts of an ecosystem that can restrict the growth of a population

• the maximum population that can reproduce in an area

• the maximum number of predators that live in an area

Which is an example of a natural disaster limiting population growth?

• A month of heavy rainfall fills up watering holes, and a zebra population has plenty of water

• Space in a forest becomes crowded, and a population of low-lying plants cannot get enough sunlight

• A strong thunderstorm destroys many of the nests of a bird population

• A month of colder air in the spring delays the growth of plants that provide food for a deer population

Which changes would most likely limit the growth of a plant-eating animal population? Select three options

• The number of predators decreases

• A spring freeze kills many plants

• Steady rainfall increases the number of plants

• The number of predators increases

• A harmful plant disease spreads through the area