ashworth-sc260-exam-2

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Online Exam 2_02

Part 1 of 1 – 95.0/
100.0 Points

Question 1 of 20 5.0/
5.0 Points

For every 10°C rise in temperature, the metabolic rate of
poikilotherms:

A. stays constant.

B. approximately doubles.

C. approximately triples.

D. approximately quadruples.

Question 2 of 20 5.0/
5.0 Points

Plants adapted to low-nutrient environments are
characterized by:

A. a high growth rate.

B. decreased root production.

C. increased leaf longevity.

D. faster growth when more nitrogen is available.

Question 3 of 20 5.0/
5.0 Points

Which of the following factors does NOT influence animal
heat exchange?

A. Oxygen diffusion rate

B. Conductivity of fat

C. Movement of blood to the body’s surface

D. Fat thickness

Question 4 of 20 5.0/
5.0 Points

Submerged aquatic plants can take up CO2 from the water in
all of the following ways EXCEPT:

A. diffusion through stomata.

B. direct diffusion of ambient CO2 from water across cell
membranes.

C. active transport of bicarbonate into the leaf followed by
conversion to CO2.

D. excretion of carbonic anhydrase into the water, followed
by uptake of the resulting CO2.

Question 5 of 20 5.0/
5.0 Points

Overall, water movement from the soil, through plant
tissues, and finally to the atmosphere through

transpiration is driven by a gradient of:

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A. water potential.

B. osmotic pressure.

C. water temperature.

D. specific leaf area.

Question 6 of 20

All the following are plant adaptations to low temperatures
EXCEPT:

A. shedding leaves at the onset of cold weather.

B. production of antifreeze molecules.

C. a shifting of Topt.

D. increased photosynthetic rate to heat leaves.

Question 7 of 20

The respiration rate of homeotherms is proportional to:

A. air pressure.

B. body temperature.

C. body mass.

D. environmental temperature.

Question 8 of 20

Researchers Rosemary and Peter Grant have discovered that
beak size frequency of Galápagos Island medium ground finch populations varies
with all the following EXCEPT:

A. rainfall.

B. seed hardness.

C. seed size.

D. seed color.

Question 9 of 20

An allele that completely masks the effect of another allele
is considered:

A. codominant.

B. dominant.

C. ineffective.

D. recessive.

Question 10 of 20

The gene pool refers to all of the genetic information
within a:

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A. cell.

B. individual.

C. population.

D. species.

Question 11 of 20

Animals that feed on both plant and animal tissues are
referred to as:

A. herbivores.

B. carnivores.

C. omnivores.

D. detritivores.

Question 12 of 20

Individual beak size of individual finches of the Galápagos
Islands:

A. may change during a bird’s lifetime.

B. will always match the beak size useful for seed foraging.

C. has nothing to do with overall population
characteristics.

D. will greatly influence individual survival.

Question 13 of 20

In photosynthesis, the net uptake of CO2 by a plant is
greatest:

A. when PAR equals zero.

B. at the light compensation point.

C. during photoinhibition.

D. at the light saturation point.

Question 14 of 20

Pneumatophores are typical of plants (particularly trees):

A. in arid environments.

B. exposed to fluctuating water levels.

C. flooded once each year.

D. in salt marshes.

Question 15 of 20

The C4 photosynthetic pathway is most common in:

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A. gymnosperm trees.

B. angiosperm trees.

C. algae, bryophytes, and ferns.

D. grasses and shrubs in warm and dry climates.

Question 16 of 20

What is the primary original source of genetic variation in
a population?

A. Mutation

B. Genetic drift

C. Blending inheritance

D. Cloning

Question 17 of 20

In comparison with a blue whale, a shrew has:

A. a larger surface area relative to volume.

B. the same surface area relative to volume.

C. a slightly smaller surface area relative to volume.

D. a much smaller surface area relative to volume.

Question 18 of 20

The fitness of an individual is measured by:

A. the proportion of heterozygous alleles within its genome.

B. its body size.

C. its efficiency in obtaining energy.

D. the proportionate contribution it makes to future
generations.

Question 19 of 20

A gene is:

A. a stretch of DNA coding for a polypeptide chain (sequence
of amino acids).

B. a microscopic, threadlike body within a cell.

C. any heritable behavioral, morphological, or physiological
trait of an organism.

D. all of the DNA in a cell.

Question 20 of 20

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Carbon balance focuses on the balance between:

A. uptake of CO2 in photosynthesis and loss of heat via
evapotranspiration.

B. loss of CO2 through respiration and gain of nutrients.

C. loss of H2O balanced with the gain of CO2 via
transpiration.

D. uptake of CO2 in photosynthesis balanced with the loss of
CO2 during respiration.

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