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environmental science a - unit 5: exam

Terms in this set (25)

what is the definition of a population?
members of a species that live in one area and interact with one another
which characteristics are true of a population? select all that apply.
a population is a group of organisms from one species.

individuals in a population can breed with one another.

individuals in a population live in one geographical area together.
which factors cause the size of a population to increase? select all that apply.
birth rate
immigration
which factors affect population size but are also reversible? select all that apply.
emigration
immigration
which statement is the best definition of the term birth rate?
XXX the number of offspring per individual every year

try: the number of individuals that produce offspring in a population over a period of time
which statement best describes the term death rate?
the number of deaths in a population per unit of time
a small town had a population of 5,000 people in the year 2010. the birth rate that year was 3 per every 1,000 people. the death rate was 4 per every 1,000 people. two members of the population immigrated, and 20 members of the population emigrated. using this information, what is the population size for the year 2011?
XXX 4,981
a population consisted of 100,000 individuals in the year 2015. the death rate was 25 per every 1,000 individuals. if the population size was 105,000 in the year 2016, what was the birth rate in 2015?
XXX 50.25 per every 1,000
what does it mean in the context of population dynamics if a population is stable?
XXX birth and death rates are neither increasing nor decreasing, and the population is not changing in size.
the demographic transition model shows five stages of population growth and decline. put the stages in the appropriate order by matching the order number with each correct stage name.
1: high stationary
2: early expanding
3: late expanding
4: low stationary
5: declining
what necessary features should be included on a population growth curve graph? select all that apply.
time as the independent variable
a line showing change in population
population as the dependent variable
which statement best describes a logistic growth curve?
the population growth slowly increases over time, then rapidly increases, then slowly increases again, forming an s-shape.
which graph shows exponential growth in a population?
d
which sentence distinguishes between exponential and linear growth?
exponential growth increases rapidly over time; linear growth occurs at a steady rate.
what is a limiting factor?
a resource that limits the growth or abundance of a population
which phrase describes carrying capacity?
the largest number of individuals an environment can support over a sustained period of time
what factors affect the carrying capacity of the environment? select all that apply.
climate
living space
food and water availability
amy is looking for a model of the relationship between limiting factors and carrying capacity.

which would be the best model?
XXX a compressed spring because limiting factors and carrying factors both decrease or increase together
which option defines sustainable?
the use of resources at a rate which allows them not to become depleted
according to this model, what limits the population of fish in the lake?
XXX a high algal biomass
which part of the graph represents the carrying capacity for this population?
the dashed line running through the wobbling line
what happens to the population when the birth rate is greater than the death rate, assuming no other factors impact population size?
population size increases
what immediate impact does a pandemic, or disease that spreads worldwide, have on human population?
it decreases the human population.
which statement best explains the carrying capacity of the human population?
XXX the carrying capacity of the human population is the maximum number of people for which the earth's environment can provide food, water, shelter, mates, and other factors, even if they run out.
suppose a major tsunami occurred in the pacific ocean, impacting coastal areas. what impact would this natural event have upon coastal populations?
populations would likely decrease.
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