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EHST 2110 Test 1 Part 1 Questions and Answers 100% Correct
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EHST 2110 Test 1 Part 1 Questions and Answers 100% CorrectEHST 2110 Test 1 Part 1 Questions and Answers 100% CorrectEHST 2110 Test 1 Part 1 Questions and Answers 100% CorrectEHST 2110 Test 1 Part 1 Questions and Answers 100% Correct Population: - ANSWER - Individuals of the same species living tog...

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  • August 13, 2024
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  • ehst 2110 test 1 part 1 questions and answers 100
  • ehst 2110 test 1 part 1 questions and answers
  • population answer individuals of the same sp

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EHST 2110 Test 1 Part 1 Questions and
Answers 100% Correct
Population: - ANSWER - Individuals of the same species living together within a given area


Community: - ANSWER - Different organisms are not randomly scattered, but live in together in
an orderly manner; changes in #'s of one species within a community can have major
consequences to the whole community


Ecosystems: - ANSWER - Functional units of nature in which living organisms interact with each
other and with the non-living components of their environment to process energy and cycle
nutrients.


Population dynamics: - ANSWER - The study of ecological principles that govern the ways in
which populations change in size


Characteristics unique to a given population: - ANSWER - Birth & death rates, age structure,
spatial distribution


Biotic Potential: - ANSWER - Maximum achievable growth rate with unlimited space in the
absence of limiting factors (disease, predation, food supply)


Environmental Resistance: - ANSWER - Measured difference between biotic potential of a
population and the actual observed rate of growth


Age Structure: - ANSWER - Refers to the # of people within different age categories.


Economically productive: - ANSWER - Economic progress in developing countries is burdened
by the # of dependents ( < 15 yo) who are not


More retired people creates: - ANSWER - Greater economic pressure on the working population
to support "safety net" social security systems

, Lag Phase S-Curve: - ANSWER - Slow growth


Exponential Growth Phase S-Curve: - ANSWER - Dramatic increase in population


Steady-State Equilibrium (or carrying capacity) S-Curve: - ANSWER - birth and death rate in
balance - upper asymptote of curve. Biotic potential of population and environmental resistance
in balance # birhts = # deaths


Lag phase J-curve: - ANSWER - Slow growth to start


Exponential Growth Phase J-curve: - ANSWER - Population increases at rapid rates up to or
above the carrying capacity, environmental resistance becomes effective only at last moment


J-Curve: - ANSWER - Frequently leads to population crashes


Homeostatic Controls: - ANSWER - Self-regulating factors (behavioral, physiological, & social
responses) that are important for controlling population size. Populations have optimum sizes, if
exceeded then stress related responses become evident. Possibly linked to hormonal changes
in response to crowding induced stress.


Thomas Malthus (1766-1834): - ANSWER - Population, when unchecked, increases by a
geometric ratio (2,4,8,16..) while subsistence increases by an arithmetic ration (1,2,3,4..).
Resource limits cause bouts of famine, war, and disease, leading to majority of world's
population with marginal standard of living.


Doubling Time: - ANSWER - Period of time in which a population doubles in size- good measure
of growth.


Human population "surges" seen: - ANSWER - 1) 600,000 yrs ago (development of culture)
2) 8000 BC (agricultural revolution)
3) AD 1800 (industrial/medical/scientific revolution)


Total Fertility Rate: - ANSWER - Average # children per mother during reproductive lifetime

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