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bio 171 unit 2 quizzes Questions and Answers 2024
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bio 171 unit 2 quizzes
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bio 171 unit 2 quizzesBased on these figures, the very high rates of primary production in the oceans happen
____, while the highest rates of primary production on land happen______. - answerin
coastal areas; around the equator
From what you know about the global nitrogen cycle, what is one major way that
humans alter this cycle? - answerby making nitrogen fertilizers and applying them to
large areas
If the net primary productivity of a system is 367.4 g C/m2/yr, and respiration is 111.3 g
C/m2/yr, what is the gross primary productivity of this system? - answer478.7 g C/ m2/yr
The type of energy that all cells use is ____________. - answerATP
Which of the following are "usable" forms of nitrogen (N) that plants and other primary
producers can use to build proteins? - answerboth NH4 and NO3
Conversion of N2 gas into NH3 (ammonia) is accomplished by which of the following
types of bacteria? NH3 (ammonia) in water forms NH4 (ammonium) which primary
producers can take up and use. - answernitrogen-fixing bacteria
Fungi are the most important decomposers of wood in forest ecosystems. - answertrue
According to Ostfeld, et al. in the "Of Mice and Mast" article, why is it important to
understand how indirect effects structure and affect communities of organisms? In "Of
Mice and Mast," the authors refer to "indirect interactions;" these lead to indirect effects.
- answerIf you do not consider indirect effects, your predictions for biological
communities will likely be wrong; this will make you unable to predict the effects of
human disturbance on those communities.
In 2015, over 200,000 Saiga antelopes died in Kazakhstan, and researchers recently
determined that a severe bacterial infection caused these deaths. 200,000 dead
antelopes greatly changed the ecosystem processes occurring in the dry grasslands of
Kazakhstan (48 degrees north latitude). Is the following statement likely or not likely to
occur following the mass death of these animals? Decomposition rates in this cold, dry
grassland will be higher than the decomposition rates in a tropical forest. - answerNot
likely
Which biochemical process is responsible for oxygenating the Earth's atmosphere? -
answerphotosynthesis
, Cellular respiration produces ______ from ________. Organic molecules are a source
of ______ energy that cellular respiration transfers into _____ and transforms into
_____. - answerCarbon dioxide and water; organic molecules and oxygen; chemical
potential; usable chemical energy in the form of ATP; heat energy that cannot do work
Which of the following nutrients is primarily responsible for eutrophication in the Gulf of
Mexico? - answernitrogen
Which of the following is true of gross primary production (GPP), net primary production
(NPP) and cellular respiration? Choose all valid statements; there are two. -
answerGross primary production (GPP) is always greater than net primary production
(NPP)
Gross primary production (GPP) is equal to the sum of the net primary production (NPP)
and the amount of production lost due to cellular respiration
So-called "dead zones" in coastal oceans are associated with nutrient runoff and
oxygen-depleted bottom waters. What causes the oxygen depletion? - answerNutrient
runoff enhances population growth rates of algae and cyanobacteria. When the
phytoplankton cells die, this big pulse of detritus increases population sizes of
decomposers which consume oxygen during cellular respiration.
Why do we see a pattern of high productivity in coastal areas? Choose all that apply. -
answerBecause nutrient runoff from terrestrial sources often ends up in coastal waters
and acts to fertilize phytoplankton.
Because coastal areas are often subject to upwelling due to wind and ocean currents,
which bring nutrients from deeper water to the surface.
Fungal cell walls are composed of what material? - answerchitin
Organisms that derive their energy from the sun and carbon from carbon dioxide are
____________. - answerphotoautotrophs
Which of the following is NOT a hypothesized effect of direct or indirect interactions with
mice and other small rodents in the "Of Mice and Mast" article?
You can find the article on Canvas and here: - answerHumans make more use of oak
forests during masts, because they hunt the deer that move into those forests during
mast events.
Decomposers (including many fungi) obtain carbon from ___________________. -
answerdead and decaying organic material
Which of the following statements about competition is true? - answerBird population
sizes can be limited by competition for nesting sites such as tree holes or cliff faces.
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