ECU EHST 2110 Exam 1 & 2 Ques ons and answers
Update RATED A+ NEW EDITION
Popula on - Ans individuals of the same species living together within a given area
Community - Ans different organisms are not randomly sca ered, 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 - Ans Func onal 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
Example of Ecosystem - Ans Cow pasture, salt marsh, city park, etc.
Popula on dynamics - Ans The study of ecological principles that govern the ways in which
popula ons change in size
Bio c Poten al - Ans maximum achievable growth rate with unlimited space in the absence of
limi ng factors (disease, preda on, food supply)
Environmental Resistance - Ans measured difference between bio c poten al of a popula on
and the actual observed rate of growth
S - Curve - Ans Lag Phase - Slow Growth
Drama c increase in popula on
,Birth and Death rates are balanced and
# births = # deaths
J - Curve - Ans Lag Phase - Slow Growth to start
popula on increases at rapid rates up to or above the carrying capacity, environmental
resistance becomes effec ve only at last moment
Frequently leads to popula on crashes (algal blooms / red des)
Homeosta c Controls - Ans Self-regula ng factors (behavioral, physiological, & social
responses) that are important for controlling popula on size
Snowshoe hares in Canada experience popula on crashes every ___ - ___ years (not preda on,
hun ng or disease)- stress induced degenera on of liver-convulsions, coma, death - Ans 9 - 10
Human Popula on Growth - Ans Exponen al growth during the 20th century
The peak global growth rate was during the - Ans 1970's
World Popula on Growth - Ans Intensive efforts a@er World War II to improve living standards
and ensure na onal stability are being nullified by rapid popula on growth.
Thomas Malthus - Ans Popula on, when unchecked, increases by a geometric ra o
(2,4,8,16...) while subsistence increases by an arithme c ra o (1,2,3,4...)
Resource limits cause bouts of famine, war, and disease, leading to majority of world's
popula on with marginal standard of living
Doubling Time - Ans period of me in which a popula on doubles in size- good measure of
growth
, Human popula on "surges" - Ans 1) 600,000 years ago (development of culture)
2) 8000 BC (agricultural revolu on)
3) AD 1800 (industrial/medical/scien fic revolu on) ex/ Smallpox vaccine (Edward Jenner, 1796)
Birth Rate - Ans # babies born per 1000 people per year
Where is the highest / lowest Birth Rates? - Ans Highest = Congo (46)
Lowest = Japan (9)
Death Rate - Ans # deaths per 1000 people per year
Death rates are bound to be higher in ________ ________ - Ans older popula ons
Total Fer lity Rate - Ans average # children per mother during reproduc ve life me
Growth Rate - Ans (rate of natural increase) difference between birth rate and death rate
expressed as a percentage out of 100
Growth Rate formula - Ans GR = (birth rate-death rate) / 10 = GR%
Increase in growth rates seen when improvements are made in what three things? - Ans
public sanita on, agriculture, and medicine
Growth rate 0.5 % - Ans 140 yrs doubling me
Update RATED A+ NEW EDITION
Popula on - Ans individuals of the same species living together within a given area
Community - Ans different organisms are not randomly sca ered, 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 - Ans Func onal 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
Example of Ecosystem - Ans Cow pasture, salt marsh, city park, etc.
Popula on dynamics - Ans The study of ecological principles that govern the ways in which
popula ons change in size
Bio c Poten al - Ans maximum achievable growth rate with unlimited space in the absence of
limi ng factors (disease, preda on, food supply)
Environmental Resistance - Ans measured difference between bio c poten al of a popula on
and the actual observed rate of growth
S - Curve - Ans Lag Phase - Slow Growth
Drama c increase in popula on
,Birth and Death rates are balanced and
# births = # deaths
J - Curve - Ans Lag Phase - Slow Growth to start
popula on increases at rapid rates up to or above the carrying capacity, environmental
resistance becomes effec ve only at last moment
Frequently leads to popula on crashes (algal blooms / red des)
Homeosta c Controls - Ans Self-regula ng factors (behavioral, physiological, & social
responses) that are important for controlling popula on size
Snowshoe hares in Canada experience popula on crashes every ___ - ___ years (not preda on,
hun ng or disease)- stress induced degenera on of liver-convulsions, coma, death - Ans 9 - 10
Human Popula on Growth - Ans Exponen al growth during the 20th century
The peak global growth rate was during the - Ans 1970's
World Popula on Growth - Ans Intensive efforts a@er World War II to improve living standards
and ensure na onal stability are being nullified by rapid popula on growth.
Thomas Malthus - Ans Popula on, when unchecked, increases by a geometric ra o
(2,4,8,16...) while subsistence increases by an arithme c ra o (1,2,3,4...)
Resource limits cause bouts of famine, war, and disease, leading to majority of world's
popula on with marginal standard of living
Doubling Time - Ans period of me in which a popula on doubles in size- good measure of
growth
, Human popula on "surges" - Ans 1) 600,000 years ago (development of culture)
2) 8000 BC (agricultural revolu on)
3) AD 1800 (industrial/medical/scien fic revolu on) ex/ Smallpox vaccine (Edward Jenner, 1796)
Birth Rate - Ans # babies born per 1000 people per year
Where is the highest / lowest Birth Rates? - Ans Highest = Congo (46)
Lowest = Japan (9)
Death Rate - Ans # deaths per 1000 people per year
Death rates are bound to be higher in ________ ________ - Ans older popula ons
Total Fer lity Rate - Ans average # children per mother during reproduc ve life me
Growth Rate - Ans (rate of natural increase) difference between birth rate and death rate
expressed as a percentage out of 100
Growth Rate formula - Ans GR = (birth rate-death rate) / 10 = GR%
Increase in growth rates seen when improvements are made in what three things? - Ans
public sanita on, agriculture, and medicine
Growth rate 0.5 % - Ans 140 yrs doubling me
