WorksheetsUnit 3: Population Ecology
Total questions: 25
Worksheet time: 17mins
Which curve best describes an organism that invests a lot of energy in parenting?
Generalists
Have limited unique diet
are K-selected species
Have broad niches and eat many things
Are commonly found in stable climax communities.
Specialists
Have a low tolerance for envirnmental change
Have a high tolerance for environmental change
wide range of diet
r- selected species
Which type of population distribution can help provide organisms with protection from predators?
Random distribution
Uniform distribution
Clumped distribution
either uniformed or clumped
The ___________ growth model is used to predict the growth of populations that are subject to density-______________ constraints, such as increased competition for food, water, or nest sites.
logistic; dependent
logistic; independent
exponential; independent
exponential: dependent
A population of rabbits, introduced to an island, has rapid growth for a few years and then slows. What is a likely reason for this pattern?
Sex ratio changed
Immigration has diminished
Carrying capacity was reached
Intrinsic growth rate has changed.
A population of bacteria in a Petri dish is growing at an exponential rate. Assume a starting population of 200 bacterium. If the growth rate for the species increases 10 percent every hour, approximately how long will it take for the number of bacterium to reach 400?
3 hours
6 hours
7 hours
8 hours
The population size (N) of Kenyan lions is
the estimated number of lions living in south Africa.
the estimated number of lions living within each square mile in Africa.
the estimated number of lions living in south Africa.
the estimated number of lions in Kenya during the time of measurement.
Which does NOT describe patterns of population growth?
Populations can grow without restraint as long as resources are not limiting.
The size of some populations tends to remain relatively constant over time.
In some populations size fluctuates in a cyclical pattern.
Population size is not affected by other populations.
In his 1798 book, An Essay on the Principle of Population, Thomas Malthus stated “…the power of [Earth’s human] population [to increase] is indefinitely greater than the power in the earth to produce subsistence for man.” He explained that our population increases exponentially while we can only increase our food supply linearly. Using our modern terminology, what did Malthus mean by “the power of the earth to produce subsistence for man?”
Biotic potential
Birth Rate
Carrying Capacity
Environmental resistance
A population of river otters has a population growth rate of 0.2 per year. If the population starts out with 50 individuals and there is no death and no migration, how many individuals would you expect after one year and after two years?
10 ; 2
60 ; 70
55; 67
60; 72
Characteristics of an r-selected species include
I. many offspring.
II. fast population growth rate
III. short time to reproductive maturity
I only
I and II
II and III
I, II, and III
