umaine bio100 EXAM 1 NEWEST 2025
ACTUAL EXAM COMPLETE QUESTIONS
AND CORRECT DETAILED ANSWERS
WITH RATIONALES (VERIFIED
ANSWERS) |ALREADY GRADED A+
based on the intermediate disturbance hypothesis, a community's species diversity is
increased by - Answers -✔✔ moderate leve;sof disturbance
white-breasted nuthatches and downy woodpeckers both eat insects that hide in the
furrows of bark in hardwood trees. The down woodpecker searches for insects by
hunting from the bottom of the tree trunk towards the top,, whereas the white-breasted
nuthatch searches form the top of the trunk down. These hunting behaviors best
illustrate which of the following ecological concepts? - Answers -✔✔ resource
partitioning
which of the following ecosystems has the LOWEST net primary production per square
meter? - Answers -✔✔ Open Ocean
If you applied fungicide to a cornfield, what would you expect to happen to the rates of
decomposition and net ecosystem production (NEP)? - Answers -✔✔ decomposition
would decrease and NEP would increase
To return nutrients, an ecosystem must have, at minimum, - Answers -✔✔ producers
and decomposers
Cod is a poplar fish caught for human consumption. If too many cod were removed due
to overfishing, which of the following would most likely occur? (food web diagram) -
Answers -✔✔ The leopard seals would eat more squid
If phytoplankton contain 50KJ of energy, how much of that energy will be transferred to
zooplankton grazing on those phytoplankton? - Answers -✔✔ 5KJ
Which of the following is the most complete example of an ecosystem? - Answers -✔✔
all of the organisms and their physical environment in and around the Stillwater river
Owls ear rats,mice,shrews, and small birds. Assume that one owl consumes 5,000J of
animal material, loses 2,300J in feces and own pellets, and uses 2,600J for cellular
respiration. What is the apprroximate production efficiency for this owl? - Answers -✔✔
4%
, When considering biogeochemical cycles, a major reservoir for both carbon and
nitrogen is.. - Answers -✔✔ The atmosphere
For mostterrestrial ecosystems, pyramids composed of species abundances, biomass,
and energy are similar in that they have a broad base and a narrow top. The primary
reason for this pattern is that.. - Answers -✔✔ at each step, energy is lost from the
system, because pf the second law of thermodynamics
which trophic level is the most burnable to going extinct? - Answers -✔✔ tertiary
consumer level
through time, the lineage that led to modern whales shows a change from four-limbed
land animals to aquatic animals with two limbs that function as flippers. This change is
best explained by.. - Answers -✔✔ natural selection
dawwin's finches, collected from each of the different Galapagos Islands, provided the
evidence that... - Answers -✔✔ individuals on neighboring islands look similar due to
common ancestry
both matter and energy are required by all living organisms. Matter can be acquired
from surroundings but energy must be originally captured from ______ via _____ -
Answers -✔✔ sunlight/ photosynthesis
which of the following is most likely a single-celled organism lacking organelles and
found in a "normal" pond on the UMAINE campus? - Answers -✔✔ bacteria
imagine there is a new species-specific fishing regulation that mandates only adult fish
of this species that are 75 cm or longer may be kept and shorter fish must be released.
Based on your knowledge of natural selection, you would predict that the average
length of the adult fish population will.. - Answers -✔✔ gradually decline (over many
generations)
which of the following correctly defines a population? - Answers -✔✔ individuals of the
same species in a defined area
Carrying capacity is.. - Answers -✔✔ the maximum population size that a particular
environment can support
why do populations grow more slowly as they approach their carrying capacity? -
Answers -✔✔ density-dependent factors lead to fewer births and increased mortality
you are a scientist trying to understand the structure of an ecological community. WHAT
OWULD BE COMPONENTS OF YOUR STUDY? - Answers -✔✔ -figuring out how
many different species are present in the study site
ACTUAL EXAM COMPLETE QUESTIONS
AND CORRECT DETAILED ANSWERS
WITH RATIONALES (VERIFIED
ANSWERS) |ALREADY GRADED A+
based on the intermediate disturbance hypothesis, a community's species diversity is
increased by - Answers -✔✔ moderate leve;sof disturbance
white-breasted nuthatches and downy woodpeckers both eat insects that hide in the
furrows of bark in hardwood trees. The down woodpecker searches for insects by
hunting from the bottom of the tree trunk towards the top,, whereas the white-breasted
nuthatch searches form the top of the trunk down. These hunting behaviors best
illustrate which of the following ecological concepts? - Answers -✔✔ resource
partitioning
which of the following ecosystems has the LOWEST net primary production per square
meter? - Answers -✔✔ Open Ocean
If you applied fungicide to a cornfield, what would you expect to happen to the rates of
decomposition and net ecosystem production (NEP)? - Answers -✔✔ decomposition
would decrease and NEP would increase
To return nutrients, an ecosystem must have, at minimum, - Answers -✔✔ producers
and decomposers
Cod is a poplar fish caught for human consumption. If too many cod were removed due
to overfishing, which of the following would most likely occur? (food web diagram) -
Answers -✔✔ The leopard seals would eat more squid
If phytoplankton contain 50KJ of energy, how much of that energy will be transferred to
zooplankton grazing on those phytoplankton? - Answers -✔✔ 5KJ
Which of the following is the most complete example of an ecosystem? - Answers -✔✔
all of the organisms and their physical environment in and around the Stillwater river
Owls ear rats,mice,shrews, and small birds. Assume that one owl consumes 5,000J of
animal material, loses 2,300J in feces and own pellets, and uses 2,600J for cellular
respiration. What is the apprroximate production efficiency for this owl? - Answers -✔✔
4%
, When considering biogeochemical cycles, a major reservoir for both carbon and
nitrogen is.. - Answers -✔✔ The atmosphere
For mostterrestrial ecosystems, pyramids composed of species abundances, biomass,
and energy are similar in that they have a broad base and a narrow top. The primary
reason for this pattern is that.. - Answers -✔✔ at each step, energy is lost from the
system, because pf the second law of thermodynamics
which trophic level is the most burnable to going extinct? - Answers -✔✔ tertiary
consumer level
through time, the lineage that led to modern whales shows a change from four-limbed
land animals to aquatic animals with two limbs that function as flippers. This change is
best explained by.. - Answers -✔✔ natural selection
dawwin's finches, collected from each of the different Galapagos Islands, provided the
evidence that... - Answers -✔✔ individuals on neighboring islands look similar due to
common ancestry
both matter and energy are required by all living organisms. Matter can be acquired
from surroundings but energy must be originally captured from ______ via _____ -
Answers -✔✔ sunlight/ photosynthesis
which of the following is most likely a single-celled organism lacking organelles and
found in a "normal" pond on the UMAINE campus? - Answers -✔✔ bacteria
imagine there is a new species-specific fishing regulation that mandates only adult fish
of this species that are 75 cm or longer may be kept and shorter fish must be released.
Based on your knowledge of natural selection, you would predict that the average
length of the adult fish population will.. - Answers -✔✔ gradually decline (over many
generations)
which of the following correctly defines a population? - Answers -✔✔ individuals of the
same species in a defined area
Carrying capacity is.. - Answers -✔✔ the maximum population size that a particular
environment can support
why do populations grow more slowly as they approach their carrying capacity? -
Answers -✔✔ density-dependent factors lead to fewer births and increased mortality
you are a scientist trying to understand the structure of an ecological community. WHAT
OWULD BE COMPONENTS OF YOUR STUDY? - Answers -✔✔ -figuring out how
many different species are present in the study site
