RENR Quizzes – Practice Questions and Revision Set
WEEK 12 (COMPETITION) - ANS ✔✔
Mutualistic interactions are defined as resulting in a _______ effect on species A and a
_________ effect on species B - ANS ✔✔+/+
Spanish moss is an epiphyte that grows on the limbs of trees. This type of growth allows the
moss to reach sunlight in dense forests and the trees that host the plant are not harmed. This is
an example of: - ANS ✔✔Commensalism
Some species of pines produce a toxin that directly inhibits the germination of nearby
individuals belonging to a different species. This is known as: - ANS ✔✔Allelopathy
Two cat species compete for mice in agricultural fields. Species 2 consumes so many mice that
the abundance of mice drops too low for species 1 to continue to exist in the area. This is an
example of: - ANS ✔✔Resource competition
A species of waterlily needs temperatures around 45 degrees Fahrenheit to reproduce.
Temperature is a resource for this waterlily species. - ANS ✔✔False, temperature typically
cannot be monopolized or consumed
Which of the following make up part of animal's fundamental niche? - ANS ✔✔-The water
conditions that it can grow and reproduce within.
-Interactions between the animal and a competitor that affect its ability to grow and reproduce.
-The effects of predation on the animal's survival.
, Ants and rodents eats seeds of various sizes in the Sonoran Desert. These graphs illustrate the
frequency of seeds consumed by size. Do these graphs, alone, indicate that competition is
occurring? - ANS ✔✔No, it's not clear if ants and rodents have mutually negative effects on
each other's populations
Interspecific competition will be greatest in which of the following circumstances? - ANS
✔✔Between species that share very similar resource requirements
An ecologist finds two similar flower species that live in mountain meadows, one with pink
flowers that lives high up on the mountain where it's colder and the other with purple flowers
that lives lower down where it's warmer. The ecologist hypothesizes that these two flowers
compete with each other, with the purple flowers outcompeting pink flowers but not able to
survive in colder temperatures at higher altitudes. Which of the following would be the best
experiment to test whether the flowers are in competition? - ANS ✔✔Grow both flowers alone
in both high and low plots. Also grow both flowers together in both high and low plots.
Mistletoe grows on trees and shrubs, and is attached to the host by a structure that extracts
sugars nutrients and water from the host plant. Mistletoe is an example of what type of
interaction? - ANS ✔✔Consumer-resource
Some species interactions involving herbivory can be more mutualistic than exploitative. Which
of the following herbivory examples can be considered advantageous for the plant species being
eaten? - ANS ✔✔Toucans swallow nutmeg fruits whole. They consume the outer pulp and later
regurgitate the hard inner seed, which can then germinate far from its parent tree
Goldenrod germinates and grows very quickly in an area, preventing other plants from growing
where it is. This is an example of: - ANS ✔✔Preemption
Wolves and cayotes eat similar prey items. Wolves will defend territories and prey carcasses
against cayotes, chasing and attacking cayotes that happen into their ranges. This is an example
of: - ANS ✔✔Territoriality
WEEK 12 (COMPETITION) - ANS ✔✔
Mutualistic interactions are defined as resulting in a _______ effect on species A and a
_________ effect on species B - ANS ✔✔+/+
Spanish moss is an epiphyte that grows on the limbs of trees. This type of growth allows the
moss to reach sunlight in dense forests and the trees that host the plant are not harmed. This is
an example of: - ANS ✔✔Commensalism
Some species of pines produce a toxin that directly inhibits the germination of nearby
individuals belonging to a different species. This is known as: - ANS ✔✔Allelopathy
Two cat species compete for mice in agricultural fields. Species 2 consumes so many mice that
the abundance of mice drops too low for species 1 to continue to exist in the area. This is an
example of: - ANS ✔✔Resource competition
A species of waterlily needs temperatures around 45 degrees Fahrenheit to reproduce.
Temperature is a resource for this waterlily species. - ANS ✔✔False, temperature typically
cannot be monopolized or consumed
Which of the following make up part of animal's fundamental niche? - ANS ✔✔-The water
conditions that it can grow and reproduce within.
-Interactions between the animal and a competitor that affect its ability to grow and reproduce.
-The effects of predation on the animal's survival.
, Ants and rodents eats seeds of various sizes in the Sonoran Desert. These graphs illustrate the
frequency of seeds consumed by size. Do these graphs, alone, indicate that competition is
occurring? - ANS ✔✔No, it's not clear if ants and rodents have mutually negative effects on
each other's populations
Interspecific competition will be greatest in which of the following circumstances? - ANS
✔✔Between species that share very similar resource requirements
An ecologist finds two similar flower species that live in mountain meadows, one with pink
flowers that lives high up on the mountain where it's colder and the other with purple flowers
that lives lower down where it's warmer. The ecologist hypothesizes that these two flowers
compete with each other, with the purple flowers outcompeting pink flowers but not able to
survive in colder temperatures at higher altitudes. Which of the following would be the best
experiment to test whether the flowers are in competition? - ANS ✔✔Grow both flowers alone
in both high and low plots. Also grow both flowers together in both high and low plots.
Mistletoe grows on trees and shrubs, and is attached to the host by a structure that extracts
sugars nutrients and water from the host plant. Mistletoe is an example of what type of
interaction? - ANS ✔✔Consumer-resource
Some species interactions involving herbivory can be more mutualistic than exploitative. Which
of the following herbivory examples can be considered advantageous for the plant species being
eaten? - ANS ✔✔Toucans swallow nutmeg fruits whole. They consume the outer pulp and later
regurgitate the hard inner seed, which can then germinate far from its parent tree
Goldenrod germinates and grows very quickly in an area, preventing other plants from growing
where it is. This is an example of: - ANS ✔✔Preemption
Wolves and cayotes eat similar prey items. Wolves will defend territories and prey carcasses
against cayotes, chasing and attacking cayotes that happen into their ranges. This is an example
of: - ANS ✔✔Territoriality
