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Praxis Middle School Science (5442) Sample Test

1 of 5

Which of the following best defines a closed population?





Correct Answer:
a population that remains constant without measurable change.


the concept of a closed population in ecology refers to a group of organisms in which no migration occurs, either into or out of the population. this means that the only factors affecting the population size are births and deaths - there is no addition or subtraction of individuals from external sources. therefore, under a strict definition, a closed population is theoretically isolated from influences by other populations and does not exchange individuals with them.

option (b) defines a closed population as one that "remains constant without measurable change." however, this characterization can be misleading. while it is possible for a closed population to remain constant if the birth and death rates are equal, the lack of migration does not inherently guarantee that the population size will not change. in reality, population sizes can fluctuate due to variations in birth rates, death rates, and other internal factors such as disease or food availability.

the other options given in the question refer to different ecological concepts: - a "community capable of sustaining itself under prevailing conditions" generally describes a climax community. this is a stable, mature ecological community with little change in the composition of species, which occurs at the final stage of succession. - "a community in which individuals compete for the same limited resources" defines a scenario of competition, a fundamental ecological interaction where organisms vie for the same essential resources that are in limited supply. - "an interbreeding group in a population" is known as a deme, which is a subset of a population that mates mostly within the group.

therefore, the correct answer to the question "which of the following best defines a closed population?" should focus on the isolation aspect in terms of no migration. while (b) does mention a population that "remains constant without measurable change," a more precise definition would emphasize the lack of immigration and emigration, acknowledging that internal factors could still cause the population size to vary. thus, for clarity and accuracy, the definition of a closed population should ideally state that it is isolated from external populations by lack of migration, rather than implying that its size does not change.


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