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AP Biology Unit 8 Detailed Questions and Expert Answers
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AP Biology Unit 8 Detailed Questions and ExpertAnswers
Which of the following describes the mechanism by which a plant stem grows
toward light? - ANS Cells on the dark side of the stem elongate more than those on
the lighted side.
As depicted in the diagram, honeybees communicate the location of flower
patches to members of their hives with waggle dances that give information about
the direction and distance to the flowers. Which of the following statements about
how honeybees communicate the position of flower patches is most consistent
with the model? - ANS The farther the target flowers from the hive, the longer the
waggle phase.
Hydrangea macrophylla is a species of plant with blue or pink flowers. Flower color
in Hydrangea macrophylla plants is thought to be determined primarily by soil
conditions rather than by inherited differences. Which of the following will provide
the most direct evidence that flower color in Hydrangea macrophylla is due
primarily to soil conditions? - ANS Growing cuttings from the same Hydrangea
macrophylla plant under controlled conditions that vary only with regard to soil pH
In some species of bats, adult females regurgitate (bring up food from the
stomach) to feed their young. In addition, adult bats regurgitate to feed other
adults that have not recently eaten. The adults receiving the food may be
unrelated bats who have previously participated in food sharing and are members
of the same social group. Scientists claim that sharing among unrelated adult bats
increases the fitness of the species.
,Which of the following best supports the scientists' claim? - ANS Bats that do not
find food over a 24-hour period may die, preventing their alleles from being
passed on within the social group.
Testosterone oxido-reductase is a liver enzyme that regulates testosterone levels
in alligators. One study compared testosterone oxido-reductase activity between
male and female alligators from Lake Woodruff, a relatively pristine environment,
and from Lake Apopka, an area that has suffered severe contamination. The graph
above depicts the findings of that study.
The data in the graph best support which of the following claims? - ANS
Environmental contamination reduces total testosterone oxido-reductase activity
in females.
Germination would be expected to occur first in which beaker? - ANS 1
Identify the experimental design that would determine which AIP mimic would
most effectively inhibit the production of hemolysin toxin. - ANS Grow S. aureus in
separate culture media containing one AIP mimic each and measure the
production of hemolysin toxin. The most effective AIP mimic will be in the culture
producing the lowest amount of hemolysin.
Based on the data in the table, which of the following best predicts the results of a
study in which natural populations of T. atratus and T. sirtalis are observed
together in an environment that includes a freshwater pond? - ANS T. sirtalis will
be observed near the water whether or not T. atratus is present.
, Which of the following correctly identifies the dependent variable and the
independent variable for the experiment? - ANS The independent variable is the
type of alarm, and the dependent variable is the percent of squirrels responding.
Which of the following correctly identifies the dependent and independent
variables in this experiment? - ANS The percentage of plants showing
phototropism is the dependent variable, and the color of the light is the
independent variable.
Yellow-billed cuckoos typically hatch in midJuly. Emerging cicadas are a primary
food source for nesting cuckoos. Which of the following best predicts the effect of
wildfires on yellow-billed cuckoo populations? - ANS The yellow-billed cuckoo
population will decline because the cicadas will emerge before the hatching
season begins.
To investigate whether an organism in the study is capable of both photosynthesis
and respiration, a comparison of which treatment groups is most appropriate? -
ANS I and II
Beaked whales feed at various depths, but they defecate at the ocean's surface.
Nitrogen-rich whale feces deposited in surface waters supply nutrients for algae
that are eaten by surface dwelling fish. Which of the following best predicts what
would happen if the whale population decreased? - ANS The surface fish
populations would decline due to reduced populations of algae.
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