How populations grow, limits to growth & human population growth

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

• Reproductive rate

• Population distribution

• Growth rate

• Population density

Frank observes that most of the maple trees on his land grow closely together in groups of 6 to 8 trees. This describes the...

• Reproductive rate

• Population distribution

• Age structure

• Population density

Which of the following describes the percentages of trees of different ages for the maple tress on Frank's land

• Reproductive rate

• Population distribution

• Growth rate

• Age structure

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, emigration

• emigration, Immigration

• leaving south for winter, heading north for winter

• leaving north for winter, heading south for winter

Marita notices that the jaybirds in her area have doubled over a short time. What pattern of growth doe this follow?

• Exponential Growth

• Logistic growth

Marita notices that the number of jaybirds in her area grew rapidly, but then started to decrease, following a pattern of ________, because the population approached _________.

• Exponential Growth, inflection point

• Logistic growth, limiting factor

• Exponential growth, limiting factor

• Logistic growth, carrying capacity

• 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?

• Their geographic range is changing.

• Their population density is changing.

• Their population distribution is changing.

• 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?

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

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

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

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

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?

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

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

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

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

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-1

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?

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

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

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

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

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-1