BIO 171 EXAM 3 PRACTICE QUESTIONS AND
DETAILED SOLUTIONS
◉ most climate models predict that during the 21st century average
global climate temperature will increase by.
Answer: 1-4 degrees Celcius
◉ Estimates are that all natural processes (not including human
activities) result in a near balance between carbon entering and
leaving the atmosphere (actually slightly less entering than leaving).
Using the fluxes in the Global Carbon Cycle (Fig 46.8), determine the
net flux of carbon, taking into account fluxes that add carbon to the
atmosphere (arrows point up) and fluxes that result in carbon
coming out of the atmosphere and going to a biological or geological
pool (arrows point down).
What is the estimate of the excess CO2 in gigatons of carbon per year
added to the atmosphere from human activities (that is, the amount
above that removed by natural processes)?.
Answer: 5-6 gigatons/yr
◉ which states related to recent climate change (within last 150
years) is best supported by data and climate models?.
, Answer: recent global warming is primarily the result of human
activities that increase concentrations of greenhouse gases
◉ There is a giant sequoia (Sequoiadendron giganteum) named
Washington (after George Washington) that was believed to be the
second largest tree in the world (253.7 ft in height!) until it was
struck by lightning in 2003. The lightning strike caused a fire at the
top of the tree that reduced Washington's height to about 229 feet.
Carbon released from the tree due to that fire could have:.
Answer: -traveled through the air and eventually dissolved into the
ocean
-been incorporated into the wood of a nearby sequoia through the
processes of photosynthesis and biosynthesis
◉ In addition to carbon dioxide, which of the following are also
considered to be greenhouse gases?.
Answer: water vapor and methane
◉ Which of the following is associated with increased emergence of
new infectious diseases?.
Answer: human exploration of wild areas
◉ Consider a population that has only intraspecific competition
affecting its growth. Which of the following are accurate? Choose all
that are correct; there are three correct statements..
DETAILED SOLUTIONS
◉ most climate models predict that during the 21st century average
global climate temperature will increase by.
Answer: 1-4 degrees Celcius
◉ Estimates are that all natural processes (not including human
activities) result in a near balance between carbon entering and
leaving the atmosphere (actually slightly less entering than leaving).
Using the fluxes in the Global Carbon Cycle (Fig 46.8), determine the
net flux of carbon, taking into account fluxes that add carbon to the
atmosphere (arrows point up) and fluxes that result in carbon
coming out of the atmosphere and going to a biological or geological
pool (arrows point down).
What is the estimate of the excess CO2 in gigatons of carbon per year
added to the atmosphere from human activities (that is, the amount
above that removed by natural processes)?.
Answer: 5-6 gigatons/yr
◉ which states related to recent climate change (within last 150
years) is best supported by data and climate models?.
, Answer: recent global warming is primarily the result of human
activities that increase concentrations of greenhouse gases
◉ There is a giant sequoia (Sequoiadendron giganteum) named
Washington (after George Washington) that was believed to be the
second largest tree in the world (253.7 ft in height!) until it was
struck by lightning in 2003. The lightning strike caused a fire at the
top of the tree that reduced Washington's height to about 229 feet.
Carbon released from the tree due to that fire could have:.
Answer: -traveled through the air and eventually dissolved into the
ocean
-been incorporated into the wood of a nearby sequoia through the
processes of photosynthesis and biosynthesis
◉ In addition to carbon dioxide, which of the following are also
considered to be greenhouse gases?.
Answer: water vapor and methane
◉ Which of the following is associated with increased emergence of
new infectious diseases?.
Answer: human exploration of wild areas
◉ Consider a population that has only intraspecific competition
affecting its growth. Which of the following are accurate? Choose all
that are correct; there are three correct statements..
