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Chapter 2&3 Test
Terms in this set (30)
a possible explanation of observations
a well tested and widely accepted idea, princliple, or model
contains the chosen variable that is changed in a known way
facts collected by making observations
controlled experiment group in which no variable is changed
the ecological pyramid which best explains why there are typically only four or five links in a food chain, is the pyramid of
the amount of energy transferred from an organism on one trophic level to the next trophic level is approximately....%
the form of nitrogen most usable to plants is
all of the following increase the amount of carbon dioxide in teh atmosphere EXCEPT:
e. volcanic eruptions
if there are 500,000 kilocalories in the producer level, how many kilocalories will become incorporated in the tissues of the secondary consumers?
if there are 500,000 kilocalories in the producer level, how many will become incorporated int eh tissues of Tertiary consumers?
the consumer group (separate from the rest of the pyramid) is know as the:
what is Net Primary Productivity?
the rate at which energy for use by consumers is stored in biomass
the shorter the food chain...
the smaller the loss of usable energy
this ecosystem has the lowest level of kilocalories per square meter per year?
Ammonium ions are converted to nirtite ions and nitrate ions through the process of
when orgainisms die, their nitrogenous organic compounds are converted to simple inorganic compounds such as ammonia through the process of
nitrogen gas is converted to ammonia through
a group of individuals of the same species occupying a given area at the same time is called
the place where an organism lives is its
a community of living orgainisms interacting with one another and the physical and chemical factors of their nonliving environment is called
Which of the following includes all the others?
what percent of the incoming solar energy is captured by the green plants and bacteria and fuels photosynthesis to make the orgainc compounds that most lifeforms need to survive
less than 1%
the cycle MOST responsible for linking the other biogeochemical cycles is the
in a food chain dealing with krill eating marine producer, followed by the krill being eaten by a penguine, which in turn is consumed by an orca(killer whale), the Secondary consumer is:
life on earth depends on interaction of gravity, the cycling of matter, and
one way flow of energy
process closely associated with plants in the Legume family
ammonia is converted to nitrate and finally to nitrogen gas through the process
if grass stores 1000 energy units recieved from the sun, and the ecological efficiency of the ecosystem is 10% and the trophic levels are grass, cow, and human, how many units of energy does the human recieve of the original 1000units?
an ecosystem can survive without
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