BIOS 242 Exam 2 Complete Questions And Answers
An ecological relationship in which both individuals benefit (+/+) is known as (correct
answer) mutualism
A relationship in which both actors may (potentially) be harmed (-/-) is known as
(correct answer) competition
What happens when a keystone species is removed from a community? (correct
answer) community could collapse
Which of the following is true about a keystone species? (correct answer) It has a
strong impact on the community, far out of proportion to its abundance.
After a glacier melts, over time, the area may become covered by shrubs and finally
a forest. This process is best described as __________. (correct answer) primary
succession
Which of the following could be defined as the role an organism plays in an
ecosystem? (correct answer) niche
When sea otters became extremely rare on the California coast, their usual prey
(sea urchins) became overabundant and consumed most of the kelp that was the
principal habitat for a diversity of fishes and invertebrates. Which statement best
describes this situation? (correct answer) sea otters are a keystone species
An ecological relationship in which an animal is hunted, captured, and killed is known
as (correct answer) predation
Different species of insect-eating birds in a forest will hunt for their prey in different
parts of the same tree. For example, Myrtle Warblers hunt for insects at the lower
levels of a tree, whereas Cape May Warblers hunt for insects at the top of the tree.
What does hunting for insects in different parts of the tree accomplish? (correct
answer) It reduces interspecific competition and allows coexistence of multiple
species.
What is a climax community? (correct answer) The stable community achieved at the
end of the process of succession
Which type of organism weakens, but does not kill, another organism by taking water
and nutrients from that organism? (correct answer) parasites
Although most competition is subtle, under which of the following circumstances
would interspecific competition be most obvious? (correct answer) When a foreign
organism is first introduced into a community
, Which of the following statements describes a response of predators to prey?
(correct answer) A species of fish hides in a hole until another fish swims past that it
can attack and eat.
The giant green sea anemone of the Pacific Northwest coast consists of a cnidarian
and alga. The alga performs photosynthesis and shares some of its carbohydrates
with the cnidarian. The cnidarian provides the alga with some carbon dioxide and
ammonia. This is an example of (correct answer) mutualism
Communities undergoing primary succession are (correct answer) started from bare
rock
When a relationship between species A and species B is described as mutualism,
this means that (correct answer) both species benefit
_______ describes a relationship between organisms that live in close physical
contact with each other. (correct answer) symbiosis
When goats were introduced into an island off the California coast, they lived in the
same areas and ate the same plants as the native deer. The deer population
subsequently dwindled and finally disappeared. This is an example of (correct
answer) competition
After clear-cutting a forest, timber companies cannot afford to wait for the long
process of __________ to occur naturally to regrow the trees, so they usually replant
trees right away. (correct answer) succession
A researcher wanting to learn more about the interactions between bees and the
flowers they pollinate would study a (correct answer) community
Our environment has a carrying capacity for the number of humans it can support.
How have we overcome the natural limits on our population growth? (correct answer)
Technology and agricultural production have raised Earth's carrying capacity for
humans.
According to the demographic transition model, what is the relationship between
births, deaths, and population size in the final stage of the model (Stage 4)? (correct
answer) Births equal deaths, but with a large population size
According to the IPAT equation, which statement about the technology (T) part of
this equation is true? (correct answer) Technology can either increase or decrease
our environmental impact.
Many European nations feel their birth rates are too __________, and governments
outside Europe feel their birth rates are too __________. (correct answer) low; high
To understand the history of a human population and predict its future,
demographers must do more than tally the overall number of individuals. Which of
the following descriptions is an inference that can be made from age pyramid
An ecological relationship in which both individuals benefit (+/+) is known as (correct
answer) mutualism
A relationship in which both actors may (potentially) be harmed (-/-) is known as
(correct answer) competition
What happens when a keystone species is removed from a community? (correct
answer) community could collapse
Which of the following is true about a keystone species? (correct answer) It has a
strong impact on the community, far out of proportion to its abundance.
After a glacier melts, over time, the area may become covered by shrubs and finally
a forest. This process is best described as __________. (correct answer) primary
succession
Which of the following could be defined as the role an organism plays in an
ecosystem? (correct answer) niche
When sea otters became extremely rare on the California coast, their usual prey
(sea urchins) became overabundant and consumed most of the kelp that was the
principal habitat for a diversity of fishes and invertebrates. Which statement best
describes this situation? (correct answer) sea otters are a keystone species
An ecological relationship in which an animal is hunted, captured, and killed is known
as (correct answer) predation
Different species of insect-eating birds in a forest will hunt for their prey in different
parts of the same tree. For example, Myrtle Warblers hunt for insects at the lower
levels of a tree, whereas Cape May Warblers hunt for insects at the top of the tree.
What does hunting for insects in different parts of the tree accomplish? (correct
answer) It reduces interspecific competition and allows coexistence of multiple
species.
What is a climax community? (correct answer) The stable community achieved at the
end of the process of succession
Which type of organism weakens, but does not kill, another organism by taking water
and nutrients from that organism? (correct answer) parasites
Although most competition is subtle, under which of the following circumstances
would interspecific competition be most obvious? (correct answer) When a foreign
organism is first introduced into a community
, Which of the following statements describes a response of predators to prey?
(correct answer) A species of fish hides in a hole until another fish swims past that it
can attack and eat.
The giant green sea anemone of the Pacific Northwest coast consists of a cnidarian
and alga. The alga performs photosynthesis and shares some of its carbohydrates
with the cnidarian. The cnidarian provides the alga with some carbon dioxide and
ammonia. This is an example of (correct answer) mutualism
Communities undergoing primary succession are (correct answer) started from bare
rock
When a relationship between species A and species B is described as mutualism,
this means that (correct answer) both species benefit
_______ describes a relationship between organisms that live in close physical
contact with each other. (correct answer) symbiosis
When goats were introduced into an island off the California coast, they lived in the
same areas and ate the same plants as the native deer. The deer population
subsequently dwindled and finally disappeared. This is an example of (correct
answer) competition
After clear-cutting a forest, timber companies cannot afford to wait for the long
process of __________ to occur naturally to regrow the trees, so they usually replant
trees right away. (correct answer) succession
A researcher wanting to learn more about the interactions between bees and the
flowers they pollinate would study a (correct answer) community
Our environment has a carrying capacity for the number of humans it can support.
How have we overcome the natural limits on our population growth? (correct answer)
Technology and agricultural production have raised Earth's carrying capacity for
humans.
According to the demographic transition model, what is the relationship between
births, deaths, and population size in the final stage of the model (Stage 4)? (correct
answer) Births equal deaths, but with a large population size
According to the IPAT equation, which statement about the technology (T) part of
this equation is true? (correct answer) Technology can either increase or decrease
our environmental impact.
Many European nations feel their birth rates are too __________, and governments
outside Europe feel their birth rates are too __________. (correct answer) low; high
To understand the history of a human population and predict its future,
demographers must do more than tally the overall number of individuals. Which of
the following descriptions is an inference that can be made from age pyramid
