BIO 100 Holechek (ASU) Exam 4 Review
UPDATED ACTUAL Exam Questions and
CORRECT Answers
A fungus and an algae grow together to produce what we call a lichen. When investigators
separate out the fungus from the alga and try to grow them in the same habitat but each alone,
they all die. What hypothesis most logically explains this phenomenon? - CORRECT
ANSWER - The fungus and the algae have a mutualistic relationship. They only survive
when they are together because each organism benefits from their interaction, thus when they are
separated they do not get the benefits as when they are together.
Polar Bears live on the Arctic ice and are huge. They are fierce predators and hunt seals to make
it through the cold winters at these high latitudes. What hypothesis most logically explains why
Polar Bears are so large? - CORRECT ANSWER - Polar Bears are so large because they
have a lot of fat and fur that keeps them warm while living in extremely cold environments. They
have a higher volume to surface area ratio so they lose less heat.
A five-degree increase in the ocean temperature off the coast of Washington caused sea stars to
stop feeding on clams in the rocky intertidal. The clams quickly became the dominant species in
the intertidal, and the diversity of invertebrate species in this habitat fell by half. Why? -
CORRECT ANSWER - The Sea Stars were the Keystone Species. Once they were gone,
the balance of life in the interval was thrown off allowing the clams, that were once kept in place
by the sea stars, to become the dominant species.
If the Earth's axis of rotation were perpendicular to the sun's rays and not tilted 23.5°, what
would result - CORRECT ANSWER - NO SEASONS
In the tropical rain forest of Borneo, six species of closely-related insectivorous birds live in the
same section of forest. Investigators have been able to establish that insect food for all these
species is the limiting resource that controls their population numbers and survival. These
investigators have also shown that the size of the bill of each of these species determines the size
and type of insect each species can eat. What hypothesis could explain how these six bird species
could avoid or minimize competition for the insects? - CORRECT ANSWER - They will
have different types/sizes of beaks so they can eat different foods
, Pioneer species in plant succession arrive at cleared areas to germinate. However, when they
grow, the shade they produce makes it impossible for their own seeds to again germinate there
because of their shade intolerance. Instead other more shade-tolerant species come in, grow, and
force out the pioneer species. How do pioneer species ever get their seeds germinate if the parent
plants always modify the habitat enough to make it inhospitable? - CORRECT
ANSWER - Pioneer Species would be able to grow if they are moved to a new area by
wind or other similar mechanisms.
Seven species of butterflies and moths in Amazonian Peru all share a color pattern of yellow,
orange and black stripes. They occur side by side, are about the same size, and even have the
same sing-flapping flight pattern. Many birds in this area feed on flying insects. What hypothesis
most logically explains why these butterflies and moths all look so similar? - CORRECT
ANSWER - Since monarchs are poisonous and thus are not eaten by birds, the moths will
look similar to protect themselves from the birds. This is called mimicry.
You have been recruited for a new reality game show on FOX network TV. On Christmas Day,
the producers blindfold you, put you on a jet airliner and then a helicopter and fly for many hours
(whether in a straight line or in circles is not obvious). A day later you are dropped off and told
to figure out where you are and that your goal is to make it back to Arizona. You immediately
use the extensive information learned in BIO 100 to orient yourself. You notice that the day
length is 20 hours, with only 4 hours of night and that there are very few trees in the area. Where
do you think you are? - CORRECT ANSWER - Argentina
Why do markets for Black Pepper, Tea, and sun-grown Coffee affect tropical rain forest
differently than Vanilla, Brazil Nuts and Mexican Chocolate? - CORRECT ANSWER -
Black Pepper, Tea, and Coffee destroy the rain forest when cultivated. Vanilla, Brazil nuts, and
Mexican chocolate keep it intact when they are cultivated.
As a UN consultant in Bolivia, they want you to document the impact of pollution on natural
habitats throughout the country within a year. Because you have so little money and time, you
choose species to represent the impact of the pollution within each habitat-bioindicators. On
what basis might you select the best bioindicators? - CORRECT ANSWER - Select a
species that is aware of when the environment changes, will leave if an environment isn't
fit/changes, is high up on food chain level, and is sensitive to change.
Mutualism: - CORRECT ANSWER - When two species benefit from an interaction. Ex:
Bees & Flowers
UPDATED ACTUAL Exam Questions and
CORRECT Answers
A fungus and an algae grow together to produce what we call a lichen. When investigators
separate out the fungus from the alga and try to grow them in the same habitat but each alone,
they all die. What hypothesis most logically explains this phenomenon? - CORRECT
ANSWER - The fungus and the algae have a mutualistic relationship. They only survive
when they are together because each organism benefits from their interaction, thus when they are
separated they do not get the benefits as when they are together.
Polar Bears live on the Arctic ice and are huge. They are fierce predators and hunt seals to make
it through the cold winters at these high latitudes. What hypothesis most logically explains why
Polar Bears are so large? - CORRECT ANSWER - Polar Bears are so large because they
have a lot of fat and fur that keeps them warm while living in extremely cold environments. They
have a higher volume to surface area ratio so they lose less heat.
A five-degree increase in the ocean temperature off the coast of Washington caused sea stars to
stop feeding on clams in the rocky intertidal. The clams quickly became the dominant species in
the intertidal, and the diversity of invertebrate species in this habitat fell by half. Why? -
CORRECT ANSWER - The Sea Stars were the Keystone Species. Once they were gone,
the balance of life in the interval was thrown off allowing the clams, that were once kept in place
by the sea stars, to become the dominant species.
If the Earth's axis of rotation were perpendicular to the sun's rays and not tilted 23.5°, what
would result - CORRECT ANSWER - NO SEASONS
In the tropical rain forest of Borneo, six species of closely-related insectivorous birds live in the
same section of forest. Investigators have been able to establish that insect food for all these
species is the limiting resource that controls their population numbers and survival. These
investigators have also shown that the size of the bill of each of these species determines the size
and type of insect each species can eat. What hypothesis could explain how these six bird species
could avoid or minimize competition for the insects? - CORRECT ANSWER - They will
have different types/sizes of beaks so they can eat different foods
, Pioneer species in plant succession arrive at cleared areas to germinate. However, when they
grow, the shade they produce makes it impossible for their own seeds to again germinate there
because of their shade intolerance. Instead other more shade-tolerant species come in, grow, and
force out the pioneer species. How do pioneer species ever get their seeds germinate if the parent
plants always modify the habitat enough to make it inhospitable? - CORRECT
ANSWER - Pioneer Species would be able to grow if they are moved to a new area by
wind or other similar mechanisms.
Seven species of butterflies and moths in Amazonian Peru all share a color pattern of yellow,
orange and black stripes. They occur side by side, are about the same size, and even have the
same sing-flapping flight pattern. Many birds in this area feed on flying insects. What hypothesis
most logically explains why these butterflies and moths all look so similar? - CORRECT
ANSWER - Since monarchs are poisonous and thus are not eaten by birds, the moths will
look similar to protect themselves from the birds. This is called mimicry.
You have been recruited for a new reality game show on FOX network TV. On Christmas Day,
the producers blindfold you, put you on a jet airliner and then a helicopter and fly for many hours
(whether in a straight line or in circles is not obvious). A day later you are dropped off and told
to figure out where you are and that your goal is to make it back to Arizona. You immediately
use the extensive information learned in BIO 100 to orient yourself. You notice that the day
length is 20 hours, with only 4 hours of night and that there are very few trees in the area. Where
do you think you are? - CORRECT ANSWER - Argentina
Why do markets for Black Pepper, Tea, and sun-grown Coffee affect tropical rain forest
differently than Vanilla, Brazil Nuts and Mexican Chocolate? - CORRECT ANSWER -
Black Pepper, Tea, and Coffee destroy the rain forest when cultivated. Vanilla, Brazil nuts, and
Mexican chocolate keep it intact when they are cultivated.
As a UN consultant in Bolivia, they want you to document the impact of pollution on natural
habitats throughout the country within a year. Because you have so little money and time, you
choose species to represent the impact of the pollution within each habitat-bioindicators. On
what basis might you select the best bioindicators? - CORRECT ANSWER - Select a
species that is aware of when the environment changes, will leave if an environment isn't
fit/changes, is high up on food chain level, and is sensitive to change.
Mutualism: - CORRECT ANSWER - When two species benefit from an interaction. Ex:
Bees & Flowers
