Question 1

Which of the following is an example of an abiotic factor that could limit the distribution of a plant species in a particular region?

Accepted Answer

Soil pH

Question 2

A population of deer is found only in areas where water sources are abundant. Which population characteristic does this scenario best illustrate?

Accepted Answer

Clumped dispersion

Question 3

Which of the following equations correctly represents exponential population growth?

Accepted Answer

$$dN\/dt = rN$$

Question 4

A researcher observes that a population of fish in a lake has a uniform dispersion pattern. What is the most likely explanation for this pattern?

Accepted Answer

Fish maintain territories to reduce competition.

Question 5

Which of the following is NOT a method for measuring population density?

Accepted Answer

Measuring the average body size of individuals

Question 6

In a life table, which value is most useful for predicting the future growth of a population?

Accepted Answer

The number of offspring produced at each age

Question 7

Which of the following is a biotic factor that could limit the distribution of a species?

Accepted Answer

Predation

Question 8

A population of rabbits grows according to the logistic model. If the carrying capacity ($$K) is 500 $$and the population size ($$N) is 250$$, which equation describes the rate of change in population size?

Accepted Answer

$$dN\/dt = rN(1 - N\/K)$$

Question 9

Which scenario best illustrates how dispersal can limit the distribution of a species?

Accepted Answer

A bird species is unable to reach an island due to a wide ocean barrier.

Question 10

If a population of ground squirrels produces the greatest number of offspring at age 3, what does this suggest about their reproductive strategy?

Accepted Answer

They have delayed reproduction with peak output at middle age.

Question 11

Which of the following would most likely result in a random dispersion pattern in a population?

Accepted Answer

Resources are evenly distributed and interactions among individuals are minimal.

Question 12

A population of insects is observed to have a high death rate in early life stages, but survivors live long lives. Which type of survivorship curve does this population most likely exhibit?

Accepted Answer

Type III

Question 13

Which of the following statements about population density is correct?

Accepted Answer

Population density is calculated as the number of individuals per unit area or volume.

Question 14

A population of bacteria doubles every hour. If the initial population is 100, what will the population be after 3 hours? Use the exponential growth formula $$N_t = N_0$ e$$^{rt}$$, where r$$ = \ln(2)$$ per hour.

Accepted Answer

Question 15

Which factor is most likely to cause a population to shift from exponential to logistic growth?

Accepted Answer

Increasing competition for resources as population size approaches carrying capacity

Question 16

Which of the following is a demographic characteristic of a population?

Accepted Answer

Age structure of the population

Question 17

A population of birds is observed to have a clumped dispersion pattern. Which of the following is the most likely cause?

Accepted Answer

Birds gather in areas with abundant food resources.

Question 18

Which of the following best describes a life table?

Accepted Answer

A table summarizing the survival and reproductive rates of individuals at each age

Question 19

If a population of mice has a carrying capacity ($$K) of 1000 $$and an intrinsic rate of increase ($$r) of 0.2$$, what is the expected population growth rate when the population size ($$N) is 500$$? Use the logistic growth equation $$dN\/dt = rN(1 - N\/K).$$

Accepted Answer

$$dN\/dt = 50$$

Question 20

Which of the following is most likely to be a limiting factor for a population of aquatic plants in a freshwater lake?

Accepted Answer

Oxygen concentration in the water

Population Ecology: Distribution, Density, and Population Growth

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