Vocabulary
The number of organisms per unit area
population density
_______________ is a group of the same species in the same place at the same time
population
True or False: Limiting factors can be abiotic or biotic
true
Bacteria grow __________.
exponentially
Define age structure
The number of individuals of each age by gender
Any factor in the environment that does not depend on the number of members in a population per unit area
density independent factors
What are the three types of plant and animal dispersion?
clumped, random, and uniform
Give an example of a density independent factor
natural disaster or weather event
BUSTED!
-100
Exponential growth in human population is due to
technology advances
The number of individuals moving away from a population
emigration
Which event is correlated with the beginning of exponential growth in human population?
a.the start of the Industrial Revolution
b.the invention of agriculture
c.the bubonic plague epidemic
d.the end of the Second World War
a. the start of the Industrial Revolution
Give an example of density dependent factor
parasites, predation, competition
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?
a. how many individuals find mates
b. how many individuals move in from somewhere else
c. how many individuals carry communicable diseases
d. how many individuals are young or old
b. how many individuals move in from somewhere else
DOUBLE JEOPARDY
+200
BUSTED!
-100 points
DOUBLE Jeopardy!
+200 points
Which of the following statements is correct?
a. Population size of predators increases when their prey is scarce.
b. Competition for resources is density-independent when food is plentiful.
c. Disease is density-dependent because transmission occurs more easily when a population is large.
d. A change in average temperature is a density-dependent factor because fewer organisms can acclimate to variations in temperature.
c. Disease is density-dependent because transmission occurs more easily when a population is large.
Young adult male chimpanzees look for mates outside their own population. The males then take the females back to their group. Which of the following occurs in females’ original population?
a.emigration
b.mortality
c. immigration
d. natality
a. emigration
The three major causes of human deaths throughout recorded history are war, famine, and _____________
disease
The pattern of spacing of a population within an area
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 are captured by park rangers. Describe the overall change in this horse population.
Because a total of 580 horses are added and a total of 600 horses are lost, the population decreases by 20 individuals. Mathematically, the population decreased by 20/1000 or 0.02%.
Which limiting factor is dependent on the density of the population?
a. contagious fatal virus
b. dumping toxic waste in a river
c. heavy rains and floods d. widespread forest fires
a. contagious fatal virus
How does the logistic model of population growth differ from the exponential model?
a. The exponential model shows a restricted growth rate.
b. The logistic model considers the environment’s carrying capacity.
c. The graph of the exponential model is S shaped.
d. The graph of the logistic model has a longer lag phase.
b. The logistic model considers the environment’s carrying capacity.
Define zero population growth
when birth rate equals death rate and immigration rate equals emmigration rate