Unit Test — Unit test Answers

Which of the following statements about logistic growth curves is true?a.Logistic growth curves are common for R-selected species.b.Logistic growth curves are J-shaped.c.No organisms in nature experience logistic growth rates.d.Logistic growth curves increase exponentially at first, then experience slowed growth rates.

Which of the following species would you most expect to be distributed according to a regular pattern?a.termitesb.stingless beesc.fishd.creosote bushes

For which method of determining population size is the population not aware of the sampler’s presence?a.mark/recaptureb.direct observationc.samplingd.indirect observation

Which of the following selection pressures is responsible for the limited evolutionary changes experienced by alligators and other crocodilians?a.stabilizing selectionb.directional selectionc.disruptive selectiond.high mutation rate

There are approximately 35,000 bald eagles in Alaska, which covers 586400 square miles. What is the population density for the bald eagles in Alaska? a. 17 bald eagles per square mile b. 0.04 bald eagles per square mile c. 0.06 bald eagles per square mile d. 1 bald eagle per square mile Please select the best answer from the choices provided

Population density is calculated by _______.a.dividing the number of organisms in a region by the land areab.multiplying the number of organisms in a region by the land areac.dividing the land area by the number of organisms in the regiond.by subtracting the land area from the number of organisms in a region

Natural selection is best described as _______.a.disruptive selectionb.stabilizing selectionc.a mechanism of evolutiond.directional selection

Which of the following is not true about the distribution of species?a.A species’ native range does not include areas where it was introduced by humans.b.Some species have a range they inhabit only for breeding.c.Seasonal ranges include areas where species are found for part of the year.d.All the organisms in an ecosystem share distribution patterns.

New Zealand has a population of 4,326,380 and has an area of 103,736 mi while Australia has an area of 2,967,909 mi and a population of 21,905,140. Calculate the population density for New Zealand and Australia. Round the population densities to the nearest whole number.

Explain how the method of mark and recapture works to determine population size.

Among humans more boys are born than girls, but women have significantly higher life expectancies. What is the significance of this?

Explain how and why natural selection has allowed species such as sharks and alligators to remain genetically stable for thousands of years.

Explain why random distribution patterns for species are the rarest in nature.

Regular distribution is observed for many organisms due to _______.a.the need to maximize exposure to sunlightb.the need to avoid predatorsc.interactions between individualsd.the plentiful availability of water

Adaptive melanism describes selection for _______.a.mottled pigmentationb.lighter pigmentationc.darker pigmentationd.more colorful pigmentation