Unit 4: Populations 2

A variable whose effects on the size or growth of the population are dependent of the number of individuals in the population, including availability of food, competition, or disease.

• Carrying capacity

• Limiting resource

• Density-independent factor

• Density-dependent factor

• Age structure

Any factor whose effects on the size or growth of the population are not dependent on the number of individuals in the population, such as weather.

• Carrying capacity

• Limiting resource

• Density-independent factor

• Density-dependent factor

• Age structure

A country has a total population of 1000. This year, 100 people were born, 30 people died, 50 people immigrated, and 20 people emigrated. What is the growth rate of this country?

• 0.1%

• 10%

• 0.04%

• 1%

Which of the following describes the shape of the logistic growth model with time as the independent variable and population growth as the dependent variable?

• J-shaped curve

• S-shaped curve

• Straight line

• U-shaped curve

Which of the following population description portrays the number of individuals in a particular age category?

• Population size

• Population density

• Population distribution

• Population age structure

In a Type I survivorship curve, the number of survivors remains stable, but eventually decreases sharply at a particular upper age limit. In a Type II survivorship curve, the number of survivors steadily decreases proportionally with an increase in age. Which of the following inferences can be drawn from the descriptions of survivorship curves provided above?

• Type I could represent a house mouse, which is a typical r-selected species

• Type II could be the average of r-selected and k-selected species in a specific area

• Type I could represent an oak tree species that experiences very low survivorship early and late in life

• Type II could represent a coral species that exhibits a constant decline in survivorship throughout its life

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The average number of offspring required to offset the average number of deaths in a population so that the population remains stable is referred to as:

• Crude birth rate

• Crude death rate

• Replacement level fertility

• Total fertility rate

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Which of these organisms has a survivorship curve similar to that of humans?

• Oysters

• Hawks

• Grasses

• Elephants

Which example fits the growth pattern shown in Graph II?

• A population of 10 rabbits is introduced into an area with good supply of food that regenerates easily

• A population of 4 coyotes is reintroduced into an area that previous sustained a population of several hundred coyotes before they were hunted to local extinction.

• A population of reindeer was introduced to an island with no predators and a limited food supply. After the food was consumed, there was a dramatic drop in the population size.

• The white-tailed deer population in Pennsylvania is hunted each year with limits the number of males and female that may be killed. The population is healthy and at or near its carrying capacity

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Which letter on the graph represents a population’s carrying capacity?

• A

• B

• C

• D

• E

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