Biology: Chapter 4 Test
A population's emigration is 1 month totaled 3 individuals. During the same period, immigration was 17 individuals. Natality was 12, and mortality was 25 due to a parasite infection. What was the net effect on the population size?
0
On ten acres of native forest there are 8 white-tailed deer, 7 coyotes, 45 armadillos, and 231 loblolly pine trees. Which population has the highest density?
loblolly trees
What best describes the age structure of a population with zero population growth?
the age-structure diagram would be column-shaped with all age classes approximately equal.
What does not affect the spatial distribution of a population?
the carrying capacity of a population
A demographer is investigating various populations to find out how they use resources. She wants to select the population that uses most resources per individual. Which population should she choose for her study?
the population of a industrially developed country
What event is correlated with the beginning of exponential growth in human population?
the start of the Industrial Revolution
Afghanistan has a growth rate of 4.8% per year and Niger has a growth rate of 2.6% per year. For every thousand people, how many more individuals will be added to the population in Afghanistan than Niger in one year?
22
In the year 1999, the world human population first exceeded how many people?
6 billion
American bison, which are large grazing mammals, are most often found clumped in small groups. What might you infer about the spatial distribution of American bison?
A clumped group provides better protection from predators
Which country would mostly likely have a declining birthrate?
A country changing from an agricultural economy to an industrial economy
True or False. Adding phosphate to a lake generally increases populations of algae suggesting that phosphate is normally a maximizing factor for algae populations.
False
True or False. As the human population reaches its carrying capacity, mortality will decrease.
False
True or False. Denisty-dependent limiting factors have the strongest influence on a population's growth rate when the population is small and widely spread over an area.
False
True or False. The concept of carrying capacity is used to explain why many populations exhibit increasing population size.
False
True or False. The human population growth rate has always increased.
False
True or False. To determine how many members of a population are in a given area, an ecologist would study the population's dispersion.
False
True or False. Unlike other organisms, humans have control over natural disasters that affect their population size.
False
True or False. When the human population reaches the carrying capacity, the birthrate will increase.
False
What is likely to be true of a population with an age structure that is pyramid shaped?
It has potential for rapid growth in the future.
Agriculture led to an increase in the size of the human population. What was the most important impact of agriculture on the human population size?
It stabilized and increased available food supplies
The country of Bulgaria has a negative growth rate of -.89%. The rate of immigration is .5% and the rate of emigration is -.5%. How do the birthrate and death rate of Bulgaria compare?
The birthrate has a lower value than the death rate.
How does the logistic model of population growth differ from the exponential model?
The logistic model considers the environment's carrying capacity
Suppose in a population of 1000 wild horses, there are 400 births and 220 deaths. Also, 180 new horses join the population from an area that was destroyed by fire, and 380 horses were captured by park rangers. Describe the overall change in this horse population.
The population will decrease by 20 out of 1000 horses or .2% because only 580 horses were added and 600 horses were lost.
If an isolated population's birthrate is the same year after year, why are the greater # of individuals added to the population in each successive year?
The rate applies to more individuals each year.
True or False. Disease is density-dependent because transmission occurs more easily when a population is large.
True
True or False. In the lag stage of a growth curve, the population size increases slowly.
True
True or False. The study of demographics helps to predict changes in the human population.
True
A previously rapidly growing population of green tree frogs in the park has suddenly leveled off, and is presently neither increasing or decreasing. You can probably infer that the tree frog population has reached what?
carrying capacity
The 3 major causes of human deaths throughout recorded history are war, famine, and ______________.
disease
Why does the domestication of animals tend to increase the human food supply?
domesticated animals provide food and labor for cultivation
Young adult male chimpanzees look for mates outside their own population. The males then take the females back to their group. What occurs in the female's original population?
emigration
To assess a population's growth rate, an ecologist must know how many individuals are born, how many died, and how many move away in a given period of time. What else must an ecologist know?
how many individuals move in from somewhere else
You are an ecologist collecting data about the declining growth rate of the critically endangered Philippine eagle. The eagles' only known population is estimated to have about 350-650 individuals. What can you assume is zero?
immigration
The size of a population will decrease if mortality does what?
increases
Which characteristic is typical of a k-strategist?
lengthy parental care
Density, distribution, and growth rate are characteristics used to classify what?
populations
A fruit fly that has a short life spa and produces many offspring can be classified into which reproductive strategy?
r-strategist
A flowering plant has seeds that are carried by the wind. Infer the most likely dispersion pattern of the plants that grow from these seeds.
random