Characteristics of Biomes Answers

The events that lead to genetic drift are _______.a.always natural disastersb.randomc.predictabled.related to human activities

Lions live in groups called prides. Lion populations would most likely fall in which category of population distribution?a.even b.randomc.clumpedd.density

Why was the reduction of the bison population to under 1,000 individuals a bottleneck event for the species?a.It drastically reduced the gene pool of the species.b.It reduced the territorial range available to the species.c.Foreign genes were introduced by crossbreeding with cattle.d.It reduced the prevalence of recessive traits.

Natural selection is an evolutionary mechanism by which _______.a.advantageous traits are eliminated in a populationb.advantageous traits become more common in a populationc.inherited traits pass consistently through generationsd.organisms choose which traits to look for in their offspring

Which of the following limiting factors would be directly affected by a drought?a.birth/death rateb.immigrationc.available niched.resource supply

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 30,000,000 white-tailed deer in the United States, which covers 3,536,000 square miles. What is the population density, rounded to the nearest whole number, for the white-tailed deer?a.2 deer per square mileb.4 deer per square milec.6 deer per square miled.8 deer per square mile

Which method to determine population size is the least invasive?a.mark/recaptureb.direct observationc.samplingd.indirect observation

Which of the following statements about exponential growth curves is true?a.Exponential growth curves are common for R-selected species.b.Exponential growth curves show fast growth rates followed by slow growth rates.c.No organisms in nature experience exponential growth rates.d.Exponential growth curves are S-shaped.

The _______ is the total number of organisms that an ecosystem can support.a.tolerance rangeb.carrying capacityc.competitive exclusion principled.population

A species that has experienced a severe bottleneck event would be expected to _______.a.be better able to adapt to changing environmental pressuresb.have few instances of inbreedingc.be more susceptible to disease and famined.retain significant genetic diversity

Which is not a difference between a population showing exponential growth and a population showing logistic growth?a.food limitsb.disease limitsc.carrying capacityd.mutation rate

Natural selection does not always result in an increase in genetic diversity.

Tagging animals is indicative of which type of method to determine population size?a.mark/recaptureb.direct observationc.samplingd.indirect observation

With regards to a “Data (Age) Structure Diagram”, which of the following is an indicator of a rapidly growing population? a. a large elderly population b. a large middle age population c. a large teenage population d. a large child population Please select the best answer from the choices provided

The application of pesticides to control an invasive species is an example of _______.a.mechanical control c.biological controlb.chemical controld.all of the above

The native range of a species includes all areas in which it lives.

The mark and recapture method of determining population size is always more effective than the sampling method.

The Toba supervolcanic event caused a bottleneck in the human population by _______.a.raising global temperaturesb.humans choking on volcanic ashc.inducing an ice aged.volcanic lava burning human villages