How Populations Grow

Frank counts 56 maple trees living on a 20-acre tract of land, and the data allows him to calculate the_________________ of the maple trees on the land.

Frank counts 56 maple trees living on a 20-acre tract of land, and the data allows him to calculate the population density of the maple trees on the land. He observes that most of the maple trees grow closely together in groups of 6 to 8 trees, which describes the__________________.

Frank counts 56 maple trees living on a 20-acre tract of land, and the data allows him to calculate the population density of the maple trees on the land. He observes that most of the maple trees grow closely together in groups of 6 to 8 trees, which describes the population distribution. The __________________________of the maple trees shows the percentages of trees

Marita is analyzing the population of various songbirds in her neighborhood. She estimates how the population is increasing by_____________ and decreasing by ______________as different birds enter and leave the area.

• immigration and emigration

• exponential growth and logistic growth

• carrying capacity and immigration

Tags

NGSS.MS-LS2-4

Marita thinks that the blue jay population increased by________________because it doubled over a short time, but then it followed a pattern of_______________________when the population approached the_____________________

• exponential growth, logistic growth, carrying capacity

• carrying capacity, exponential growth, logistic growth

• logistic growth, exponential growth, carrying capacity

A scientist is studying a population of sharks in the Pacific Ocean. The scientist reports that compared to a few years ago, the sharks are spending less time in equatorial waters and more time in waters near California and Alaska.

Which statement describes the type of change that is occurring to the shark population?

• A.Their geographic range is changing.

• B.Their population density is changing.

• C.Their population distribution is changing.

• D.Their carrying capacity is changing.

Tags

NGSS.MS-LS2-4

Vernon is studying the population of deer in a tract of forest. He gathers the following data.

Birth rate: ~50 deer/year

Death rate: ~70 deer/year

Which additional observation would support the conclusion that the deer population is NOT changing size from year to year, meaning that the net population change is 0?

• A.About 20 deer per year immigrate to the tract of forest.

• B.About 20 deer per year emigrate from the tract of forest.

• C.The average life span of a member of the deer population is 20 years.

• D.If a deer survives its first year of life, its average life span is 20 years.

Tags

NGSS.MS-LS2-4

The graph describes the population of dandelions in a field over the course of one summer.

Which statement best describes the growth of the dandelions?

• A.Linear growth occurs because the field provides abundant but limited resources during the summer.

• B.Logistic growth occurs because the field provides unlimited resources during the summer.

• C.Exponential growth occurs because the field provides unlimited resources during the summer.

• D.Fluctuating growth patterns occur because the population reached the carrying capacity of the field during the summer.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS2-4

The population of adult frogs in a wetlands ecosystem has increased to 1000 individuals, which is its carrying capacity. The frogs eat flies and other small animals, and they are prey for raccoons, snakes, and a variety of large birds.

Which most likely would happen if an additional 200 adult frogs immigrated to the ecosystem?

• A.The carrying capacity for frogs in the ecosystem would increase by 200 frogs.

• B.The carrying capacity for frog predators in the ecosystem would increase by 200 individuals.

• C.The frog population would experience a pattern of exponential growth.

• D.About 200 adult frogs would die because of lack of resources, or by predation.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4