Biogeochemical Cycles
Name:
1.
Date:
How do nitrogen- xing bacteria help cycle nitrogen
through ecosystems?
A.
They release nitrogen into the atmosphere
when they replicate their DNA.
B.
They convert sunlight into chemical energy
which is then stored in the nitrogen.
C.
They convert ammonia from animal feces and
urine into forms that plants can use.
6.
Which of the following best accounts for the
presence of nitrogen- xing bacteria in legume root
nodules?
D. They capture nitrogen from the atmosphere
and convert it into forms that plants can use.
2.
3.
4.
Complete burning of plant material returns carbon
primarily to the
A.
herbivores.
B.
C.
vegetation.
D. atmosphere.
A.
Nitrates are a food source for earthworms.
B.
Plants can use nitrates, but not nitrogen gas.
C.
Nitrates are one of the reactants in
photosynthesis.
D. Nitrogen gas is toxic to most plants, but
nitrates are nontoxic.
water.
7.
The natural cycling of oxygen between organisms
and their environment is most directly accomplished
through which ofthe following pairs of processes?
Carbon in the atmosphere is most often found as
which of the following compounds?
A.
fermentation and oxidation
B.
transpiration and evaporation
A.
stratospheric ozone
B.
C.
precipitation and condensation
C.
carbon monoxide
D. carbon dioxide
fossil fuel
D. photosynthesis and respiration
Where would nitrogen most easily be found in the
nitrogen cycle?
8.
Which of the following explains why elements,
such as carbon and oxygen, that are used in
organic molecules are not permanently removed
from the environment?
A.
in animal waste
B.
in drinking water supplies
A.
They are replenished by sunlight.
C.
in underground mineral deposits
B.
They are cycled through ecosystems.
C.
They are replaced by volcanic eruptions.
D. in carbon dioxide released by factories into
the atmosphere
5.
Legumes, such as clover and alfalfa, have nodules
on their roots that contain nitrogen- xing bacteria.
These bacteria convert nitrogen gas from the
atmosphere into nitrates.
D. They are produced constantly from nutrients.
In the oxygen cycle, which group of organisms
replenishes a large portion of the atmospheric
oxygen supply?
A.
mammals
B.
fungi
C.
insects
D. plants
page 1
9.
Which of the following correctly explains how
atmospheric nitrogen is converted to nitrogen
compounds used by living organisms?
A.
Sunlight converts atmospheric nitrogen to a
form usable by protists.
B.
Plant leaves convert atmospheric nitrogen to a
form usable by animals.
C.
Bacteria in soil convert atmospheric nitrogen
to a form usable by plants.
11.
The diagram below shows part of the carbon cycle.
D. Invertebrate animals in soil convert
atmospheric nitrogen to a form usable by
fungi.
10.
Fertilizers can enable farmers to grow the same
crop in a eld for several years in a row. Farmers
who use less fertilizer often rotate their crops by
planting the crop one year and legumes, such as
beans and clover, the following year.
If many trees are removed from a forest by
logging, what is the most immediate e ect on the
carbon cycle in that forest?
Fertilizer use and crop rotation with legumes both
increase the availability of which of the following
nutrients in soil?
A.
calcium
B.
nitrogen
C.
oxygen
D. protein
A.
increased rates of decomposition
B.
decreased use of atmospheric CO2
C.
decreased combustion of fossil fuels
D. increased production of organic compounds
page 2
Biogeochemical Cycles
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Biogeochemical Cycles
1.
Answer:
D
2.
Answer:
D
3.
Answer:
D
4.
Answer:
A
5.
Answer:
D
6.
Answer:
B
7.
Answer:
D
8.
Answer:
B
9.
Answer:
C
10.
Answer:
B
11.
Answer:
B
05/18/2014