Bio 109 Unit 2 Poll Questions

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

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

B. Carpel-stamen-stamen-carpel

What is a root?

A. Tissue

B. Organ

C. a specialized cell

D. biome

B. Organ

Active transport involves all of the following except:

A. Transport of solute against a concentration gradient.

B. Diffusion of solute through the lipid bilayer of a membrane.

C. Hydrolysis of ATP.

D. Pumping of solutes across the membrane.

E. Specific transport proteins in the membrane.

B. Diffusion of solute through the lipid bilayer of a membrane.

Some botanists argue that the entire plant should be considered as a single unit rather than a composite of many individual cells. Which of the following structures best supports this view?

A. The cell wall

B. The vacuole

C. The cell membrane

D. The plasmodesmata

E. The cytosol

D. The plasmodesmata

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

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.

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.

E. That antipodal cells do not develop if the egg remains unfertilized.

C. That endosperm development does not occur without fertilization of the egg.

Plants can use several mechanisms to reduce the chances of self-fertilization. Which of the following is not one of these mechanisms?

A. The formation of dioecious plants (plants having male and female reproductive organs in separate individuals).

B. Stamen and carpels that mature at different times.

C. Brightly colored bracts that replace petals.

D. Self-incompatibility.

E. Anthers and stigma that are structurally arranged to prevent pollen transfer in the same flower.

C. Brightly colored bracts that replace petals.

Asexual reproduction is most advantageous in:

A. A stable environment

B. An aquatic environment

C. An environment with pollinators

D.Crowded conditions

A. A stable environment

You are preparing seeds for shipment abroad. The trip may take several weeks. To ensure that the seeds do not germinate prematurely you might consider treating them with:

A. Carbon dioxide

B. Cytokinins

C. Ethylene

D. Auxin

E.Abscisic acid

E. Abscisic acid

Plant hormones:

A. exist in very large amounts in a plant.

B. change their shape in response to a stimulus.

C. are unable to move from one cell to another.

D. affect only cells with the Appropriate receptor.

E. are not involved in signal transduction pathways.

D. affect only cells with the appropriate receptor.

A coleoptile is grown with unidirectional light coming from the left. If a transparent cap is placed on the tip of the growing plant, what will happen to the coleoptile?

A. It will stop growing taller.

B. It will grow taller and be straight, not bending.

C. It will grow taller and bend to the right.

D. It will grow taller and bend to the left.

E. It will change color.

D. It will grow taller and bend to the left.

When climbing a mountain, we can observe transitions in biological communities that are similar to the changes:

A. in biomes at different latitudes.

B. at different depths in the ocean.

C. in a community through different seasons.

D. in an ecosystem as it changes over time.

E. across the United States from east to west.

A. in biomes at different latitudes.

Which of the following are important biotic factors that can affect the structure and organization of biological communities?

A. predation, competition

B. light intensity, seasonality

C. availability of minerals, soil pH

D. precipitation, wind

E. temperature, water availability

A. predation, competition

In an aquatic biome, does significant sunlight reach the benthic zone?

A. Yes

B. No

C. It depends on the specific ecosystem.

C. It depends on the specific ecosystem.

Uniform spacing patterns in plants such as the creosote bush are most often associated with:

A. chance

B. patterns of high humidity

C. the random distribution of seeds

D. competitive interactions among individuals in the population

E. the concentration of nutrients within the population's range

D. competitive interactions among individuals in the population

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

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.

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.

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.

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

B. Bacteria