The Cycles of Matter Answers

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Which of the following statements is true?

A
The nitrogen cycle is the most important cycle for life.
B
The oxygen cycle is the least important cycle for life.
C
Life can be sustained without any of the cycles for life present.
D
All cycles of matter are equally important for life to be sustained.
2
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The sun is the ultimate source for energy on the Earth.

A
T
B
F
3

The need for energy, gained by respiration and photosynthesis, is the driving force of the oxygen cycle.

A
T
B
F
4

Which of the following two cycles are the most closely related in their role in sustaining life?

A
carbon and nitrogen
B
water and nitrogen
C
carbon and oxygen
D
nitrogen and phosphorus
5

Biogeochemical cycles on Earth serve a variety of different purposes. What do the biogeochemical cycles have in common?

A
They all serve the same function in sustaining life on Earth.
B
They all include only nonliving components of an ecosystem.
C
They are all essential for sustaining life on Earth.
D
They all include only living components of an ecosystem.
6

In the BOREAS study, scientists are trying to determine if a large amount of carbon is being taken in by what biome?

A
rainforest
B
tundra
C
boreal forest
D
desert
7

Biogeochemical cycles recycle water and natural elements throughout the biosphere to ensure that organisms do not run out of these substances. Thiobacillus denitrificans is a specialized species of bacteria that obtains its energy from carbon dioxide and inorganic nitrogen-containing compounds such as nitrates in its environment. It is used in the bioremediation of groundwater that contains excess nitrate. How does Thiobacillus denitrificans help bioremediate groundwater?

A
nitrification
B
denitrification
C
nitrogen fixation
D
decomposition
8

Where is the water stored during the water cycle?

A
the atmosphere
B
the ground
C
the ocean
D
all of the above
9

Photolysis is a part of which cycle?

A
phosphorus
B
oxygen
C
nitrogen
D
carbon
10

What percentage of precipitation falls back onto land?

A
78%
B
92%
C
17%
D
22%

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