Biology Gang

Assuming these age-structure diagrams describe human populations, in which population is unemployment likely to be a societal issue in the future?

A) I

Which of the following statements about light in aquatic environments is correct?

A) Water selectively reflects sand absorbs certain wavelengths of light

In temperate lakes, the surface water is replenished with nutrients during turnovers that occur in the

A) autumn and spring

The most common kind of dispersion in nature is

A) clumped

The Allee effect is used to describe a population that

A) has become so small that it will have difficulty surviving and reproducing

A table listing such as items as age, observed number of organisms alive each year, and life expectancy is known as a (an)

A) life table

Which of the following characterizes relatively K-selected populations?

A) offspring with good chances of survival

The benthic zone in an aquatic biome

A) often supports communities of organisms that feed largely on detritus

In models of sigmoidal population growth,

A) population growth rate slows dramatically as N approaches K

Which of the following groups would be most likely to exhibit uniform dispersion?

A) red squirrels, who actively defend territories

Demography is the study of

A) the vital statistics of populations and how they change over time

A population of ground squirrels has an annual per capita birth rate of 0.06 and an annual per capita death rate of 0.02. Estimate the number of individuals added to (or lost from) a population of 1,000 individuals in one year.

B) 40 individuals added

Which of the following is an incorrect statement about the regulation of population?

B) Density-independent factors have an increasingly greater effect as a population's density increases

Which population is in the process of decreasing?

B) II

As N approaches K for a certain population, which of the following is predicted by the logistic equation?

B) The growth rate will approach zero

Which marine zone would have the lowest rates of primary productivity?

B) abyssal

Which lake zone would be absent in a very shallow lake?

B) aphotic zone

In which of the following terrestrial biome pairs are both dependent upon periodic burning?

B) chaparral and savanna

Two plant species live in the same biome but on different continents. Although the two species are not at all closely related, they may appear quite similar as a result of

B) convergent evolution

Which of the following is the pattern of spacing for individuals within the boundaries of the population?

B) dispersion

Which of the following levels of organization is arranged in the correct sequence from most to least inclusive?

B) ecosystem, community, population, individual

During exponential growth, a population always

B) grows at its maximum per capita rate.

You are observing a population of lizards when you notice that the number of adults has increased and is higher than previously observed. One explanation for such as observation would include

B) increased immigration

Carrying capacity is

B) the maximum population size that a particular environment can support

Which of the following can contribute to density-dependent regulation of populations?

B) transpacific competition for nutrients

A population is correctly defined as having which of the following characteristics?

C) I and II only

Assuming these age-structure diagrams describe human populations, which population is likely to experience zero population growth (ZPG)?

C) III

Which population appears to be stable?

C) III

Which of the following best describes the effect of climate on biome distribution?

C) It is not only the average cliate that is important in determining biome distribution, but also the pattern of climatic variation.

The three basic variables that make up the life history of an organism are

C) age when reproduction begins, how often reproduction occurs, and how many offspring are produced per reproductive episode.

An area in which different terrestrial biomes grade into each other is known as a(n)

C) ecotone

Where would an ecologist find the most phytoplankton in a lake?

C) photic zone

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

C) predation, competition

Which of the following abiotic factors has the greatest influence on the metabolic rates of plants and animals?

C) temperature

Which of the following is not true about estuaries?

D) Estuaries usually contain no or few producers

Imagine that you are managing a large ranch. you know from historical accounts hat wild sheep used to live there, but they have extirpated. You decide to reintroduce them.

D) a "J", increasing with each generation

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

D) competitive interactions among individuals in the population

Which of the following describes having more than one reproductive episode during a lifetime?

D) iteroparous

Species introduced to new geographic locations

D) often out-compete and displace native species for biotic and abiotic resources

The oceans affect the biosphere in all of the following ways except

D) regulating the pH of freshwater biomes and terrestrial groundwater

Which of the following assumptions have to be made regarding the capture-recapture estimate of populations size?

E) I, II, and III

Which of the following biomes is correctly paired with the description with the description of its climate?

E) Tropical forest-nearly constant day length and temperature

Which of the following organisms is the most likely candidate for geographic isolation?

E) land snail

Which is biome is able to support many large animals despite receiving moderate amounts of rainfall?

E) savanna

Pacific salmon or annual plants illustrate which of the following?

E) semelparous

Which of the following causes Earth's seasons?

E) the tilt of Earth's axis