BIO 182 EXAM 3 REVIEW QUESTIONS AND
ANSWERS WITH COMPLETE SOLUTIONS | NEW
UPDATE 2025
The atmosphere is changing because: - ANSWERS carbon is being added faster
than it is removed
exponential growth curve - ANSWERS j-shaped curve showing the rapid
increase in an exponentially growing population
There are 1000 rabbits in a population that grows 10% per month. How many
rabbits would you have after 120 months? - ANSWERS General Formula
(exponential growth--no limit)
Pop=(population)(growth rate)^number of months
At 0 months, start with 1000 rabbits.
At 1 month, you have 1000 rabbits plus the 10%, so multiply by 1.1, and each
month multiply by 1.1.
By, 120 months --> Population=(1000)(1.1)^120
Population=92,709,068 rabbits
General formula for exponential growth - ANSWERS Pop=(population)(growth
rate)^number of months
Difference between exponential growth and logistic growth - ANSWERS
Exponential growth: When resources are unlimited, populations exhibit
exponential growth, resulting in J-shaped curve
,Logistic growth: Population expansion decreases as resources become scarce;
population levels off when carrying capacity of environment is reached, resulting
in an S-shaped curve
Define population - ANSWERS Dr. Plowes Video:
"A group of organisms of the same species that inhabit a designated location. Ex.
Coyotes that inhabit south mountain; or the students of Bio 182 that are online"
Define community - ANSWERS Dr. Plowes Video:
"Multiple species that interact and are found in the same location. Ex. Human
body is a community; pores and eyelashes, have demodex mites that live there;
bacteria that live in digestive system. Can have interactions that don't negatively
affect the players, sometimes they're mutually beneficial interactions, and
sometimes one of the players benefits and the other one doesn't"
Sampling Quadrats - ANSWERS Count individuals in a few small areas and
extrapolate to the whole area. Scientists find random places to place quadrats to
get samplings and estimate population size. The more quadrats, the more
representative of the population.
Mark and Recapture - ANSWERS Capture, mark, and release individuals. Then
resample and use proportion of marked individuals to infer the total population.
In a large population, when you recapture, you should have a mix of marked and
unmarked. If you maybe marked 10% of the population the 1st time, then when
you captured them the 2nd time, then you should expect that only 10% of the
recaptured should be marked.
Mark and Recapture Math - ANSWERS # Marked 1st time = # Marked 2nd
time________
, Population Size Total Captured 2nd time
Assuming that the animals are not afraid of the scientists for capturing and
marking them...
True/False
Sampling quadrats would be the better method for estimating the number of
whales in a population. - ANSWERS False because whales are mobile
What is the equation for growth? - ANSWERS births-deaths+immigrants-
emigrants
Population size is affected by: - ANSWERS births, deaths, immigration,
emigration
equation for exponential growth - ANSWERS dN/dt=rN
r = births - deaths (per capita growth rate)
N = current population size
The human population has grown - ANSWERS exponentially
The growth of a population depends on - ANSWERS birth rate minus death
rate
A population stops growing when it - ANSWERS reaches its carrying capacity
ANSWERS WITH COMPLETE SOLUTIONS | NEW
UPDATE 2025
The atmosphere is changing because: - ANSWERS carbon is being added faster
than it is removed
exponential growth curve - ANSWERS j-shaped curve showing the rapid
increase in an exponentially growing population
There are 1000 rabbits in a population that grows 10% per month. How many
rabbits would you have after 120 months? - ANSWERS General Formula
(exponential growth--no limit)
Pop=(population)(growth rate)^number of months
At 0 months, start with 1000 rabbits.
At 1 month, you have 1000 rabbits plus the 10%, so multiply by 1.1, and each
month multiply by 1.1.
By, 120 months --> Population=(1000)(1.1)^120
Population=92,709,068 rabbits
General formula for exponential growth - ANSWERS Pop=(population)(growth
rate)^number of months
Difference between exponential growth and logistic growth - ANSWERS
Exponential growth: When resources are unlimited, populations exhibit
exponential growth, resulting in J-shaped curve
,Logistic growth: Population expansion decreases as resources become scarce;
population levels off when carrying capacity of environment is reached, resulting
in an S-shaped curve
Define population - ANSWERS Dr. Plowes Video:
"A group of organisms of the same species that inhabit a designated location. Ex.
Coyotes that inhabit south mountain; or the students of Bio 182 that are online"
Define community - ANSWERS Dr. Plowes Video:
"Multiple species that interact and are found in the same location. Ex. Human
body is a community; pores and eyelashes, have demodex mites that live there;
bacteria that live in digestive system. Can have interactions that don't negatively
affect the players, sometimes they're mutually beneficial interactions, and
sometimes one of the players benefits and the other one doesn't"
Sampling Quadrats - ANSWERS Count individuals in a few small areas and
extrapolate to the whole area. Scientists find random places to place quadrats to
get samplings and estimate population size. The more quadrats, the more
representative of the population.
Mark and Recapture - ANSWERS Capture, mark, and release individuals. Then
resample and use proportion of marked individuals to infer the total population.
In a large population, when you recapture, you should have a mix of marked and
unmarked. If you maybe marked 10% of the population the 1st time, then when
you captured them the 2nd time, then you should expect that only 10% of the
recaptured should be marked.
Mark and Recapture Math - ANSWERS # Marked 1st time = # Marked 2nd
time________
, Population Size Total Captured 2nd time
Assuming that the animals are not afraid of the scientists for capturing and
marking them...
True/False
Sampling quadrats would be the better method for estimating the number of
whales in a population. - ANSWERS False because whales are mobile
What is the equation for growth? - ANSWERS births-deaths+immigrants-
emigrants
Population size is affected by: - ANSWERS births, deaths, immigration,
emigration
equation for exponential growth - ANSWERS dN/dt=rN
r = births - deaths (per capita growth rate)
N = current population size
The human population has grown - ANSWERS exponentially
The growth of a population depends on - ANSWERS birth rate minus death
rate
A population stops growing when it - ANSWERS reaches its carrying capacity
