ENV 101 EXAM 2 QUESTIONS WITH VERIFIED
ANSWERS
What is the difference in the adaptation of a sled dog's (such as a Husky) thick coat of
hair to help it withstand the cold temperatures of Arctic winters and a dog that adapts to
cold temperatures in the fall by growing a thickened coat? The adaptation of the sled
dog best describes adaptation at the ____________ level while the dog exposed to
seasonal colder temperatures has _____________. - Answers - Population;
physiological modifications at the individual level
Evolution occurs as a result of - Answers - Better survival or reproduction rates by
individuals with a particular characteristic
Which of the following is a physiological modification used to adapt to environmental
conditions? - Answers - Leaves becoming thick and leathery on a plant growing in a dry,
hot climate
Natural selection will ultimately make a species - Answers - Better adapted to its
environment
Regular lawn mowing selects for short-headed rather than tall-headed dandelions
because - Answers - Tall flowers cannot reproduce
Tolerance limits are _______ that limit a species' survival. - Answers - Any
environmental conditions
A species can withstand a wide range of pH as an adult but the juveniles can only
withstand a narrow range of pH. The abiotic factor, pH, would best be described as a -
Answers - Critical factor
Which of the following fish species would be the best indicator of clean, well-oxygenated
water? - Answers - Rainbow trout
Populations are most critically limited by - Answers - Any of these, depending on the
system
Indicator species, such as lichens, generally have a ___________ tolerance range for a
___________. - Answers - Narrow; critical factor
What would you label the range of temperature from 90F to 94F for this particular
species? - Answers - Zone of physiological stress
, What would you label the range of temperature from 95F to 96F for this particular
species in the scenario? - Answers - Optimal range
A generalist is a species that - Answers - Occupies a variety of ecological niches
Certain night-active moths and day-active birds are specialized nectar feeders. How do
these species coexist if they are using the same resource for food? - Answers - They do
not compete for the nectar because they feed at different times of the day
Humans can best be described as - Answers - Generalists
Most organisms' niches are controlled by - Answers - Genetic determinants
Resource partitioning leads species to - Answers - All of these would be a result of
resource partitioning
Resource partitioning tends to lead to a high degree of _______ in species - Answers -
Specialization
Intraspecific competition is competition among ________ for resources - Answers -
Members of a single species
Which of the following is not a common strategy for successful interspecific
competition? - Answers - The life cycle of dragonflies (the larva live in the water)
An especially effective strategy for reducing intraspecific competition is - Answers -
Different ecological niches for juveniles and adults
Symbiosis means - Answers - Living together
In the partnership of a lichen, the fungus provides _________ and the relationship is
best described as _______. - Answers - Structure and moisture-holding ability;
mutualism
A viceroy butterfly that closely resembles the bad tasting monarch is an example of
__________ and the example of beetles that look like stinging wasps is an example of
__________. - Answers - Batesian mimicry; Batesian mimicry
A keystone species is a species whose presence - Answers - Influences the population
size of many other species in its community
In a commensal relationship - Answers - One species benefits while the other neither
suffers nor benefits
A biological community's productivity is a measure of - Answers - The amount of
biomass produced in the community
ANSWERS
What is the difference in the adaptation of a sled dog's (such as a Husky) thick coat of
hair to help it withstand the cold temperatures of Arctic winters and a dog that adapts to
cold temperatures in the fall by growing a thickened coat? The adaptation of the sled
dog best describes adaptation at the ____________ level while the dog exposed to
seasonal colder temperatures has _____________. - Answers - Population;
physiological modifications at the individual level
Evolution occurs as a result of - Answers - Better survival or reproduction rates by
individuals with a particular characteristic
Which of the following is a physiological modification used to adapt to environmental
conditions? - Answers - Leaves becoming thick and leathery on a plant growing in a dry,
hot climate
Natural selection will ultimately make a species - Answers - Better adapted to its
environment
Regular lawn mowing selects for short-headed rather than tall-headed dandelions
because - Answers - Tall flowers cannot reproduce
Tolerance limits are _______ that limit a species' survival. - Answers - Any
environmental conditions
A species can withstand a wide range of pH as an adult but the juveniles can only
withstand a narrow range of pH. The abiotic factor, pH, would best be described as a -
Answers - Critical factor
Which of the following fish species would be the best indicator of clean, well-oxygenated
water? - Answers - Rainbow trout
Populations are most critically limited by - Answers - Any of these, depending on the
system
Indicator species, such as lichens, generally have a ___________ tolerance range for a
___________. - Answers - Narrow; critical factor
What would you label the range of temperature from 90F to 94F for this particular
species? - Answers - Zone of physiological stress
, What would you label the range of temperature from 95F to 96F for this particular
species in the scenario? - Answers - Optimal range
A generalist is a species that - Answers - Occupies a variety of ecological niches
Certain night-active moths and day-active birds are specialized nectar feeders. How do
these species coexist if they are using the same resource for food? - Answers - They do
not compete for the nectar because they feed at different times of the day
Humans can best be described as - Answers - Generalists
Most organisms' niches are controlled by - Answers - Genetic determinants
Resource partitioning leads species to - Answers - All of these would be a result of
resource partitioning
Resource partitioning tends to lead to a high degree of _______ in species - Answers -
Specialization
Intraspecific competition is competition among ________ for resources - Answers -
Members of a single species
Which of the following is not a common strategy for successful interspecific
competition? - Answers - The life cycle of dragonflies (the larva live in the water)
An especially effective strategy for reducing intraspecific competition is - Answers -
Different ecological niches for juveniles and adults
Symbiosis means - Answers - Living together
In the partnership of a lichen, the fungus provides _________ and the relationship is
best described as _______. - Answers - Structure and moisture-holding ability;
mutualism
A viceroy butterfly that closely resembles the bad tasting monarch is an example of
__________ and the example of beetles that look like stinging wasps is an example of
__________. - Answers - Batesian mimicry; Batesian mimicry
A keystone species is a species whose presence - Answers - Influences the population
size of many other species in its community
In a commensal relationship - Answers - One species benefits while the other neither
suffers nor benefits
A biological community's productivity is a measure of - Answers - The amount of
biomass produced in the community
