1|Page
ASU BIO 182 EXAM 3 AND PRACTICE EXAM NEWEST
ACTUAL EXAM COMPLETE 160 QUESTIONS AND
CORRECT DETAILED ANSWERS WITH RATIONALES
(VERIFIED ANSWERS) ||ALREADY GRADED
A+||NEWEST EXAM!!!
True or False? When cane toads are added to a
community, the number of crimson finches should
decrease. - ANSWER-False; the number of crimson
finches should increase and benefit from the introduction
of cane toads as they have a negative affects on those
eating them, meaning that they are not preying on as
many crimson finches as they use to.
True or False? A cane toad is a keystone species in this
Australian community. - ANSWER-True; yet has a
negative impact on a diversity of a community.
What determines the productivity of a community? -
ANSWER-Sunlight, water, trace elements (nitrogen) and
minerals that plants can collect from the ground.
True or False? More solar radiation and more precipitation
would likely result in more energy for carnivores. -
ANSWER-True; plants absorb the solar radiation, using it
to make energy, carbohydrates from photosynthesis; then
herbivores can eat those plants and the energy can get up
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to the herbivores; if there is more solar radiation, there
could be more plant growth, and if there's more plant
growth, there could be more herbivores eating the plant
tissue; if there are more herbivores, then the carnivores
will have more food and more energy.
True or False? If productivity enhances diversity, one
should see more species in deep tropical waters than
along shallow coastlines. - ANSWER-False; so if
productivity enhances diversity, one should see more
species along shallow coastlines; even though we're not
seeing that, that's what we would predict if it was all about
productivity.
True or False? Greater productivity could support more
individuals of a species without supporting more species. -
ANSWER-True; just because you have this huge amount
of primary productivity doesn't mean that what it's gonna
give you is more species; productivity will mean that you
can have more organisms in a place, but it doesn't
guarantee you having more species in a place; the
difference between more and diverse is important; when
you have a lot of productivity, all you get is more gray
squirrels and more blue jays, but you don't get lots of
different birds and lots of different squirrels, or lots of
different mammals and rodents.
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The greatest density of species occurs at the North Pole. -
ANSWER-False
Species in the tropics should have
__________________________ - ANSWER-narrow
niches because they experience stable conditions.
Dan Janzen argued that tropical communities contain
more species because __________________________ -
ANSWER-tropical environments favor specialized niches,
which limits gene flow and promotes speciation.
Tropical species are __________________________ -
ANSWER-most at risk from climate change because
tropical species likely have narrow niches.
True or False? Dan Janzen proposed that speciation
occurs more often in the tropics because tropical species
mutate faster. - ANSWER-False; he did not mention faster
rates of mutation; he did mention that there is far more
variation in climate in high latitudes than there are in the
tropics.
True or False? A more specialized species should occur
over a narrower range of altitudes. - ANSWER-True; a
ASU BIO 182 EXAM 3 AND PRACTICE EXAM NEWEST
ACTUAL EXAM COMPLETE 160 QUESTIONS AND
CORRECT DETAILED ANSWERS WITH RATIONALES
(VERIFIED ANSWERS) ||ALREADY GRADED
A+||NEWEST EXAM!!!
True or False? When cane toads are added to a
community, the number of crimson finches should
decrease. - ANSWER-False; the number of crimson
finches should increase and benefit from the introduction
of cane toads as they have a negative affects on those
eating them, meaning that they are not preying on as
many crimson finches as they use to.
True or False? A cane toad is a keystone species in this
Australian community. - ANSWER-True; yet has a
negative impact on a diversity of a community.
What determines the productivity of a community? -
ANSWER-Sunlight, water, trace elements (nitrogen) and
minerals that plants can collect from the ground.
True or False? More solar radiation and more precipitation
would likely result in more energy for carnivores. -
ANSWER-True; plants absorb the solar radiation, using it
to make energy, carbohydrates from photosynthesis; then
herbivores can eat those plants and the energy can get up
,2|Page
to the herbivores; if there is more solar radiation, there
could be more plant growth, and if there's more plant
growth, there could be more herbivores eating the plant
tissue; if there are more herbivores, then the carnivores
will have more food and more energy.
True or False? If productivity enhances diversity, one
should see more species in deep tropical waters than
along shallow coastlines. - ANSWER-False; so if
productivity enhances diversity, one should see more
species along shallow coastlines; even though we're not
seeing that, that's what we would predict if it was all about
productivity.
True or False? Greater productivity could support more
individuals of a species without supporting more species. -
ANSWER-True; just because you have this huge amount
of primary productivity doesn't mean that what it's gonna
give you is more species; productivity will mean that you
can have more organisms in a place, but it doesn't
guarantee you having more species in a place; the
difference between more and diverse is important; when
you have a lot of productivity, all you get is more gray
squirrels and more blue jays, but you don't get lots of
different birds and lots of different squirrels, or lots of
different mammals and rodents.
, 3|Page
The greatest density of species occurs at the North Pole. -
ANSWER-False
Species in the tropics should have
__________________________ - ANSWER-narrow
niches because they experience stable conditions.
Dan Janzen argued that tropical communities contain
more species because __________________________ -
ANSWER-tropical environments favor specialized niches,
which limits gene flow and promotes speciation.
Tropical species are __________________________ -
ANSWER-most at risk from climate change because
tropical species likely have narrow niches.
True or False? Dan Janzen proposed that speciation
occurs more often in the tropics because tropical species
mutate faster. - ANSWER-False; he did not mention faster
rates of mutation; he did mention that there is far more
variation in climate in high latitudes than there are in the
tropics.
True or False? A more specialized species should occur
over a narrower range of altitudes. - ANSWER-True; a
