BIO 109 UNIT 2 POLL EXAM
QUESTIONS AND ANSWERS
An ecologist recorded 12 white-tailed deer per square mile in one woodlot and 20
per square mile on another woodlot. What was the ecologist comparing?
A. density
B. dispersion
C. carrying capacity
D. range - ANSWER-A. Density
The graph above shows changes in a wild sheep population that were introduced to
the island of Tasmania in the early 1800s. The graph indicates that the sheep
population most likely is:
A. growing in excess of its carrying capacity, since fluctuations in population size
occurred after 1850.
B. headed for extinction because of the population explosion around 1930.
C. regulated by density-independent factors, because there appears to be about a
10-year cycle of sharp declines in size.
D. shifting from K-selected strategy to an r-selected strategy.
E. stable after 1850 under the effects of density-dependent regulating factors. -
ANSWER-E. stable after 1850 under the effects of density-dependent regulating
factors.
What does not contribute to a species' life history?
A. When reproduction begins, how often the organism reproduces
B. How many offspring are produced during each reproductive episode
C. How likely each offspring is to die by predation. - ANSWER-C. How likely each
offspring is to die by predation.
Because only about ten percent of the energy of one trophic level is converted into
organisms at the next trophic level:
A. food chains are rarely longer than 4 or 5 links.
B. there are relatively few top predators in an ecosystem.
C. there will nearly always be more herbivores than carnivores.
D. All of the above are true. - ANSWER-D. All of the above are true.
Plants cannot incorporate nitrogen into organic compounds and therefore depend on
______ to make nitrogen available to them.
A. Animals
B. Bacteria
C. Protists
D. Fungi
E. Viruses - ANSWER-B. Bacteria
, A person working with plants may remove apical dominance by doing what to the
plant
A. Pruning
B. Deep watering the roots
C. Fertilizing
D. Transplanting
E. Playing soft music - ANSWER-A. Pruning
Based on the ABC model, what would be the structure of a flower (in a cross-section
of the flower, from the outside to the center) that had normal expression of genes C
and B but lacked expression of gene A?
A. Carpel-petal-petal-carpel
B. Carpel-stamen-stamen-carpel
C. Sepal-petal-petal-sepal
D. Sepal-sepal-carpel-carpel
E. Carpel-stamen-carpel-stamen - ANSWER-B. Carpel-stamen-stamen-carpel
What is a root?
A. Tissue
B. Organ
C. a specialized cell
D. biome - ANSWER-B. Organ
A water soluble toxin is found in the groundwater where a plant is growing. Which of
the following is best able to prevent that toxin from entering the xylem in the plant
root?
A. The companion cell
B. The cork
C. The Casparian strip
D. The cuticle
E. The stele - ANSWER-C. The Casparian strip
At equilibrium across a permeable membrane, how much movement of a solute
occurs?
A. Movement occurs in one direction but not both
B. There is no movement
C. There is no net movement because there is equal movement in both directions. -
ANSWER-C. There is no net movement because there is equal movement in both
directions.
What does double fertilization ensure?
A. That the egg cell is fertilized.
B. That the endosperm is fertilized.
C. That endosperm development does not occur without fertilization of the egg.
D. That polar nuclei and synergids are fertilized simultaneously.
QUESTIONS AND ANSWERS
An ecologist recorded 12 white-tailed deer per square mile in one woodlot and 20
per square mile on another woodlot. What was the ecologist comparing?
A. density
B. dispersion
C. carrying capacity
D. range - ANSWER-A. Density
The graph above shows changes in a wild sheep population that were introduced to
the island of Tasmania in the early 1800s. The graph indicates that the sheep
population most likely is:
A. growing in excess of its carrying capacity, since fluctuations in population size
occurred after 1850.
B. headed for extinction because of the population explosion around 1930.
C. regulated by density-independent factors, because there appears to be about a
10-year cycle of sharp declines in size.
D. shifting from K-selected strategy to an r-selected strategy.
E. stable after 1850 under the effects of density-dependent regulating factors. -
ANSWER-E. stable after 1850 under the effects of density-dependent regulating
factors.
What does not contribute to a species' life history?
A. When reproduction begins, how often the organism reproduces
B. How many offspring are produced during each reproductive episode
C. How likely each offspring is to die by predation. - ANSWER-C. How likely each
offspring is to die by predation.
Because only about ten percent of the energy of one trophic level is converted into
organisms at the next trophic level:
A. food chains are rarely longer than 4 or 5 links.
B. there are relatively few top predators in an ecosystem.
C. there will nearly always be more herbivores than carnivores.
D. All of the above are true. - ANSWER-D. All of the above are true.
Plants cannot incorporate nitrogen into organic compounds and therefore depend on
______ to make nitrogen available to them.
A. Animals
B. Bacteria
C. Protists
D. Fungi
E. Viruses - ANSWER-B. Bacteria
, A person working with plants may remove apical dominance by doing what to the
plant
A. Pruning
B. Deep watering the roots
C. Fertilizing
D. Transplanting
E. Playing soft music - ANSWER-A. Pruning
Based on the ABC model, what would be the structure of a flower (in a cross-section
of the flower, from the outside to the center) that had normal expression of genes C
and B but lacked expression of gene A?
A. Carpel-petal-petal-carpel
B. Carpel-stamen-stamen-carpel
C. Sepal-petal-petal-sepal
D. Sepal-sepal-carpel-carpel
E. Carpel-stamen-carpel-stamen - ANSWER-B. Carpel-stamen-stamen-carpel
What is a root?
A. Tissue
B. Organ
C. a specialized cell
D. biome - ANSWER-B. Organ
A water soluble toxin is found in the groundwater where a plant is growing. Which of
the following is best able to prevent that toxin from entering the xylem in the plant
root?
A. The companion cell
B. The cork
C. The Casparian strip
D. The cuticle
E. The stele - ANSWER-C. The Casparian strip
At equilibrium across a permeable membrane, how much movement of a solute
occurs?
A. Movement occurs in one direction but not both
B. There is no movement
C. There is no net movement because there is equal movement in both directions. -
ANSWER-C. There is no net movement because there is equal movement in both
directions.
What does double fertilization ensure?
A. That the egg cell is fertilized.
B. That the endosperm is fertilized.
C. That endosperm development does not occur without fertilization of the egg.
D. That polar nuclei and synergids are fertilized simultaneously.
