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Biogeochemical Cycles

Total questions: 139

Worksheet time: 1hrs 27mins

Name
Class
Date
1.

Oxygen enters seawater mainly

a)

through the respiration of animals

b)

as a byproduct of photosynthesis

c)

as a result of decomposition of plant and animal remains

d)

through the oxidation of metal ions in seawater

2.

Organisms that can exist with light as an energy source and an inorganic form of carbon and other raw materials:

a)

are called photoautotrophs.

b)

do not exist in nature.

c)

are called heterotrophs.

d)

are best classified as decomposers.

3.

What goes in Box 5 of the food web in the picture?

a)

herbivores

b)

scavengers

c)

carnivores

d)

decomposers

4.

The ultimate source of energy for communities associated with hydrothermal vents is:

a)

chemicals contained in hot seawater

b)

sinking detritus from the surface waters

c)

energy derived from photosynthesis, as in almost all other communities

d)

chemical synthesis of organic molecules by bacteria

e)

algae

5.

The nitrogen cycle is one of the most important and complex of the biogeochemical cycles. It is important because nitrogen:

a)

is a greenhouse gas

b)

is an essential part of biological molecules such as proteins and nucleic acids (DNA)

c)

is the most toxic element to living organisms

d)

dilutes the oxygen in the atmosphere causing respiratory problems

e)

is a crucial part of the process of photosynthesis

6.

The most abundant gaseous components of the Earth's atmosphere are:

a)

carbon dioxide and oxygen.

b)

nitrogen and hydrogen.

c)

nitrogen and carbon dioxide.

d)

nitrogen and oxygen.

e)

oxygen and carbon dioxide.

7.

The major source of carbon dioxide in seawater is:

a)

from photosynthesis by marine plants.

b)

from rain falling into the ocean.

c)

from the respiration of marine animals and other organisms.

d)

from seafloor sediments.

e)

runoff from land

8.

a chemical that provides what is needed for organisms to live and grow

a)

nutrient cycles

b)

nutrients

c)

reservoir

d)

source

9.

part of the abiotic phase of the nutrient cycle where nutrients can remain for long periods of time

a)

tree

b)

nutrient

c)

decomposer

d)

reservoir

10.

the flow of water from land caused by precipitation

a)

run-off

b)

upwelling

c)

assimilation

d)

leaching

11.

the movement of cold, nutrient-rich water from deep in the ocean to the surface

a)

run-off

b)

upwelling

c)

assimilation

d)

leaching

12.

Why can't phytoplankton or plants survive the environment surrounding a hydrothermal vent?

a)

Too much pressure

b)

Not enough dissolved CO2

c)

Extreme temperatures

d)

No sunlight

13.

What negative consequence could be the result of excess nutrient runoff from land?

a)

Reduction in dissolved oxygen

b)

Too much photosynthesis

c)

Reduced uptake

d)

Harmful algae blooms

14.

Tube worms don't eat bacteria but they get help from bacteria to get energy via

a)

symbiosis

b)

ingestion of bacteria

c)

predation

d)

scavenging

15.

Select all the reason there is more dissolved oxygen at the surface is higher than deeper part of the ocean.

a)

Less diffusion from the atmosphere

b)

More producers= less photosynthesis

c)

Algae and phytoplankton are present

d)

there is more turbulence and mixing produces air bubbles

16.

Match the following Monomer to the Macromolecule

a)

Fatty acid & Glycerol

1.

Lipid

b)

monosaccharide

2.

Carbohydrate

c)

Amino acid

3.

Protein

d)

nucleotide

4.

Nucleic Acid

17.

What is the original, and primary reservoir of inorganic phosphate (PO43-) in terrestrial ecosystems?

a)

live plants and animals

b)

groundwater

c)

the atmosphere

d)

rocks

18.

Nitrogen and carbon are cycled on a global scale. Why does phosphorus cycling tend to occur more locally?

a)

it primarily involves the weathering of rocks, which are mostly stationary

b)

it only involves land animals that cannot swim across oceans to transport the nutrient

c)

it occurs in areas where cloud formation is low, so it rarely gets trapped in water vapors

d)

all of the answers are correct

19.

The phosphorus cycle occurs much more quickly than the carbon and nitrogen cycles.

a)

true

b)

false

20.

This is NOT a part of the phosphorus cycle.

a)

Phosphate is incorporated into sedimentary rocks

b)

Phosphate bound to soil

c)

Atmospheric or gaseous phosphate

d)

Phosphate is absorbed from the soil by plants

21.
Phosphorous is passed from plants to ____ who eat them
a)
plants
b)
animals
c)
scavengers
22.
Which of the following statements is true of the phosphorus cycle?
a)
Phosphorus enters the atmosphere as phosphates.
b)
The phosphorus cycle utilizes the processes of erosion, and weathering.
c)
Phosphates are used in carbohydrate and glucose storage.
d)
The phosphorus cycle utilizes bacteria to breakdown phosphates and make them available for plants.
23.
What role do decomposers play in the phosphorous cycle?
a)
absorb phosphorous 
b)
release phosphorous into atmosphere
c)
return phosphorous into the soil
d)
combustion
24.

T/F. The phosphorus cycle does not have a gas phase.

a)

true

b)

false

25.

The physical and chemical breakdown of rocks causes phosphate ions to be released.

a)

Decomposition

b)

Sedimentation

c)

Uplift

d)

Weathering

26.

____________ cycle is a pathway by which a chemical substance moves through biotic and abiotic compartments of Earth.

a)

Biogeochemical

b)

Hydrosphere

27.

Does the phosphorus cycle obey the law of conservation of mass? Why?

a)

Yes. Phosphorus is never created or destroyed, just changes forms.

b)

No. Phosphorus is always being created or destroyed.

28.

Where is phosphorus located?

a)

in the atmosphere

b)

in Earth's crust

29.

How do plants obtain phosphorus?

a)

Absorbing it from gas in the air

b)

Absorbing from the soil

30.

What three organisms play a role in the phosphorus cycle?

a)

nitrifying bacteria, denitrifying bacteria, and decomposers

b)

plants, animals, and decomposers

c)

neither of these

31.

Which of the following is a human activity that artificially increases the amount of phosphorus in an area?

a)

Deforestation

b)

Adding Fertilizer to farmlands.

c)

Removing Phosphorus from rock formations

32.

What is not a step in the phosphorus cycle?

a)

Evaporation

b)

Weathering

c)

Absorption by plants

d)

Absorption by animals

33.

What are 2 human impacts on the phosphorus cycle?

a)

Fertilizer runoff

b)

Crop harvest

c)

livestock wastes

d)

atmospheric pollution

34.

Why is Phosphorus important?

a)

can be used by vegetation and soil microbes for normal growth

b)

Protein

 

c)

Sugar

d)

Cell membrane

35.

Where is Phosphorus stored?

a)

Rock/Soil

b)

organisms

c)

Atmosphere

d)

oceans

36.
How much of the atmosphere is composed of nitrogen gas?
a)
87%
b)
38%
c)
78%
d)
21%
37.
Organisms that need nitrogen to survive
a)
only plants
b)
only animals
c)
only bacteria
d)
all living organisms
38.
Plants and animals cannot use nitrogen directly from the air.
a)
True
b)
False
39.
After plants and animals contain nitrogen, what puts it back into atmosphere and soil?
a)
decomposition
b)
precipitation
c)
condensation
d)
bacteria
40.
What happens when organisms die and decay? 
a)
Their bodies are lifted up
b)
Their nitrogen returns to the soil
c)
they keep their nitrogen
d)
They stay on earth forever
41.
Nitrification happens in the ______
a)
Air 
b)
Soil 
c)
Ground Water 
d)
Plants 
42.

What is the formula for atmospheric nitrogen?

a)

N

b)

N2

c)

NH3

d)

NO3

43.

What process occurs when dead plant and animal matter decomposes and nitrogen is released back into the atmosphere?

a)

Assimilation

b)

Fixation

c)

Ammonification

d)

Denitrification

44.

A correct path that nitrogen could take would be

a)

air -> animals -> plants -> bacteria

b)

animals -> air -> bacteria -> plants

c)

bacteria -> air -> plants -> animals

d)

air -> bacteria -> plants -> animals

45.
What role do decomposers play in the phosphorous cycle?
a)
absorb phosphorous 
b)
release phosphorous into atmosphere
c)
return phosphorous into the soil
d)
combustion
46.

Phosphorus is used to make phospholipids which makes up the _________________.

a)

cell membrane

b)

cell wall

c)

nucleus

47.
When water is heated in the ocean by the sun and turns into water vapor
a)
condensation
b)
evaporation
c)
transpiration
d)
runoff
48.

When water vapor is cooled and forms droplets of liquid water

a)

Condensation

b)

Evaporation

c)

Transpiration

d)

Runoff

49.
Forms of precipitation are-
a)
only sleet and snow
b)
rain, sleet, hail, and snow
c)
only dew and rain 
d)
only snow and rain
50.
Precipitation occurs because 
a)
the droplets evaporate in the air
b)
the droplets are too light for the air to hold
c)
the droplets are too heavy for the air to hold
51.
What is water that flows in rivers and streams into the oceans and lakes?
a)
evaporating
b)
condensing
c)
precipitating
d)
runoff
52.

________________ is movement of water past the soil going deep into the groundwater.

a)

Evaporation

b)

Transpiration

c)

Percolation

d)

Sublimation

53.

____________________ is the process by which water on the ground surface enters the soil.

a)

Infiltration

b)

Percolation

c)

Deposition

d)

Condensation

54.

__________________ is the process by which moisture is carried through plants from roots to small pores on the underside of leaves, where it changes to vapor and is released to the atmosphere. It is essentially evaporation of water from plant leaves.

a)

Transpiration

b)

Percolation

c)

Infiltration

d)

Plant Uptake

55.

Water that flows across the land and enters rivers and streams. It eventually flows into lakes and the ocean.

a)

Transpiration

b)

Surface Runoff

c)

Deposition

d)

Precipitation

56.
What happens to particles when they are heated?
a)
They speed up and spread out
b)
They slow down and compress
c)
They stop moving
d)
They move closer together and speed up
57.

How does water enter a plant?

a)

through the stomata

b)

through the roots

c)

by active transport in root hair cells

d)

by osmosis in root hair cells

58.

What allows water to stick to particles of dust in the air, thereby condensing to form clouds?

a)

Cohesion

b)

Adhesion

c)

Dipole moment

d)

Phloem

59.

What is it called when water sticks to water?

a)

Cohesion

b)

Adhesion

c)

Capillary Action

d)

Xylem

60.
Water exits the leaf through the __.
a)
Stomata
b)
Flower
c)
Roots
d)
Phloem
61.

This vascular tissue (tubes) is responsible for the transportation of water and minerals up from the roots to the stem then leaves

a)

Stomata

b)

Shoot

c)

Phloem

d)

Xylem

62.

Select one way to reduce water use.

a)

wash dishes under a running tap

b)

install a rain barrel to downspouts

c)

take baths instead of showers

63.
When water vapor at the surface changes from gas directly to ice crystals, what forms?
a)
dew
b)
fog
c)
frost 
d)
rain
64.
 When water vapor at the surface condenses and temperatures are above freezing, what forms?
a)
dew
b)
fog
c)
frost
d)
rain
65.
Through which water cycle processes does water vapor enter the atmosphere?
a)
condensation, transpiration 
b)
evaporation, transpiration
c)
evaporation,  condensation 
d)
precipitation, evaporation 
66.
When liquid water gains enough heat energy it will--- 
a)
precipitate
b)
condense
c)
run-off
d)
evaporate
67.
What force drives water to move downhill both on the surface and underground?
a)
Magnetism 
b)
Attraction
c)
Gravity
d)
Repulsion
68.
What is number 2?
a)
Surface Run-off
b)
Condensation
c)
Transpiration
d)
Evaporation
69.
What is number 1?
a)
Precipitation
b)
Condensation
c)
Evaporation
d)
Transpiration
70.
What is number 3?
a)
Transpiration
b)
Condensation
c)
Evaporation
d)
Precipitation
71.
What is number 4?
a)
Transpiration
b)
Condensation
c)
Evaporation
d)
Precipitation
72.
What is number 5?
a)
Evaporation
b)
Surface Run-off
c)
Ground water
d)
Condensation
73.
What is number 6?
a)
Precipitation
b)
Evaporation
c)
Transpiration
d)
Accumulation
74.

How is nitrogen "fixed" into a usable form for plants?

a)

Through action of bacteria only

b)

Through lightning only

c)

Through action of bacteria and lightning

d)

Through photosynthesis

75.

The nitrogen cycle is unique in that atmospheric nitrogen cannot be converted directly by organisms into usable nitrogen. What is necessary in order for atmospheric nitrogen to be converted to a usable form of nitrogen by organisms?

a)

Ammonification

b)

Denitrifying bacteria

c)

Nitrifying bacteria

d)

Decomposition

e)

Nitrogen fixation

76.

Cultural eutrophication is a result of

a)

a mixing of multiple cultures in one area

b)

excess nutrients entering aquatic environments from sources such as sewage and fertilizers

c)

Excess nutrients entering aquatic environments from weathering rocks

d)

Genetic pollution

e)

Increasing vehicle traffic

77.

Nitrogen fixation is a necessary part of the nitrogen cycle because

a)

Atmospheric nitrogen cannot be used directly by organisms

b)

There is not enough nitrogen in the atmosphere

c)

Nitrogen needs to be combined with phosphorus

d)

Bacteria needs to be created to help with plant growth

e)

Nitrogen in the soil needs to be fixed to go back to the atmosphere

78.

Which molecule is consumed during decomposition in an aquatic environment, potentially leading to a hypoxic (low-oxygen) situation?

a)

Nitrogen

b)

Phosphorus

c)

Calcium

d)

Carbon

e)

Oxygen

79.

Nitrates are converted to nitrogen gas by soil bacteria.

a)

Ammonification

b)

Dentrification

c)

Nitrification

d)

Nitrogen fixation

e)

Assimilation

80.

NH4+ (ammonia) is converted into NO2- (nitrites) and then into NO3- (nitrates).

a)

Ammonification

b)

Denitrification

c)

Nitrification

d)

Nitrogen Fixation

e)

Assimilation

81.

Plants take up and incorporate nitrogen compounds into proteins, DNA and RNA.

a)

Ammonification

b)

Denitrification

c)

Nitrification

d)

Nitrogen Fixation

e)

Assimilation

82.

Nitrogen gas is combined with hydrogen gas to form NH3 (ammonia)

a)

Ammonification

b)

Denitrification

c)

Nitrification

d)

Nitrogen fixation

e)

Assimilation

83.

The use of nitrogen-based fertilizers in the Midwestern United States is a major contributing factor to which of the following?

a)

Spread of the West Nile virus

b)

Hypoxia in the Gulf of Mexico

c)

Water shortages in communities near the Great Lakes

d)

Soil erosion in Texas

e)

The increase in severe storms in the Southeastern United States

84.

A field is abandoned, and an invasive plant that can live in

nutrient-poor soil moves into the field. If the land is later

cleared of this invasive species and it is discovered that the

soil has an abundance of nitrogen compounds, what

conclusion can best be made?

a)

The plants used up all of the phosphorus and potassium and left the nitrogen behind.

b)

Primary succession always produces an abundance of nitrogen.

c)

Bacteria in soil and in root nodules converted free nitrogen into nitrogen compounds.

d)

The plants were able to produce nitrogen in their leaves.

e)

More rock was weathered and broken down to release nitrogen compounds.

85.

In the nitrogen fixation cycle, cyanobacteria in the soil and water and Rhizobium bacteria in root systems are responsible for converting

a)

organic material to ammonia and ammonium ions

b)

ammonia, ammonium ions, and nitrate ions to DNA, amino acids, and proteins

c)

ammonia and nitrite ions to nitrate ions

d)

nitrogen and hydrogen gas to ammonia

e)

nitrogen gas to ammonia

86.

Which of the following is a macronutrient essential for the formation of amino acids and proteins?

a)

Sulfur

b)

Nitrogen

c)

Iron

d)

Cobalt

e)

Molybdenum

87.

All of the following have an impact on the nitrogen cycle EXCEPT

a)

the planting of legume plants

b)

weathering of rock

c)

slashing and burning of tropical areas

d)

the discharge of municipal waste into waterways

e)

the production of fertilizers using the Haber-Bosch process

88.

Which of the following bacteria are able to convert soil nitrites to nitrates

a)

Nitrosomonas

b)

Nitrobacter

c)

Rhizobium

d)

Penicillium

e)

Clostridium

89.

Ammonium ions (NH4+) are converted to nitrate (NO3-) and nitrite ions (NO2-) through which process?

a)

Assimilation

b)

Denitrification

c)

Nitrogen fixation

d)

Nitrification

e)

Ammonification

90.

Which form of nitrogen is most usable by plants?

a)

Nitrate

b)

Nitrite

c)

Nitrogen gas

d)

Ammonia

e)

Atomic nitrogen

91.

In which stage of the nitrogen cycle do soil bacteria convert ammonium ions (NH4+) into nitrate ions (NO3-); a form of nitrogen that can be used by plants?

a)

Nitrogen fixation

b)

Nitrification

c)

Assimilation

d)

Ammonification

e)

Denitrification

92.

Which statement correctly describes the role of bacteria/fungi?

a)

The bacteria/fungi convert radiant energy into chemical energy.

b)

The bacteria/fungi directly provide a source of nutrition for animals.

c)

The bacteria/fungi are decomposers, restoring inorganic material to the environment so elements are made available to other organisms.

d)

The bacteria/fungi convert atmospheric nitrogen into minerals and are found in the nodules of cacti.

e)

The bacteria/fungi consume live plants and animals.

93.

Which of the following processes is known as ammonification (organic nitrogen to ammonia)?

a)

Nitrogen Fixation

b)

Nitrification

c)

Assimilation

d)

Decomposition

e)

Denitrification

94.

a gas without color or smell, that burns easily and is used as fuel. Natural gas consists mainly of this...

a)

Carbon

b)

Glucose

c)

Carbonate

d)

Methane

95.

a chemical element found in all living things, existing in a pure state in two main forms (diamond and graphite)

a)

Carbon

b)

Glucose

c)

Carbon dioxide

d)

Carbon monoxide

96.

a gas breathed out by people and animals from the lungs or produced by burning carbon

a)

Carbonate

b)

Carbon dioxide

c)

Methane

d)

Glucose

97.

a poisonous gas formed when carbon burns partly but not completely. It is produced when gas is burned in car engines.

a)

Carbonate

b)

Carbon

c)

Carbon monoxide

d)

Glucose

98.

a simple type of sugar that is an important energy source in living things and which is a part of many carbohydrates

a)

Reservoir

b)

Glucose

c)

Carbon

d)

Carbon dioxide

99.

a measurement of the speed at which something happens

a)

Diffusion

b)

Combusition

c)

Rate

d)

Efflux

100.

the process by which green plants turn carbon dioxide and water into food using energy obtained from light from the sun

a)

Photosynthesis

b)

Respiration

c)

Decomposition

d)

Diffusion

101.

a process in living organisms involving the production of energy, typically with the intake of oxygen and the release of carbon dioxide

a)

Decomposition

b)

Respiration

c)

Diffusion

d)

Combustion

102.

the process of burning

a)

Diffusion

b)

Respiration

c)

Photosynthesis

d)

Combustion

103.

fuel such as coal or oil, that was formed over millions of years from the remains of animals or plants

a)

Fossil Fuel

b)

Weathering

c)

Sedimentation

d)

Carbon monoxide

104.

the process of leaving a layer of sediment

a)

Weathering

b)

Sedimentation

c)

Flow

d)

Biogeochemical

105.

matter can not be created or destroyed

a)

Law of Conservation of Matter

b)

Decomposition

c)

Photosynthesis

d)

Flow

106.

How do animals get carbon?

a)

By eating plants and or other animals.

b)

They absorb it from the atmosphere.

c)

From the ground

d)

They do not get carbon from anywhere.

107.

What are fossil fuels made from?

a)

Plants and animals that are buried underground for millions of years.

b)

They absorb it from the atmosphere.

c)

Water

d)

Wind

108.

What is the greatest contributor to atmospheric carbon?

a)

burning garbage

b)

burning biomass

c)

transportation

d)

household usage

109.

What are two (2) ways to reduce the carbon emissions from passenger cars?

a)

Use less expensive gas

b)

Carpooling

c)

Public Transportation

d)

Driving only passenger cars

110.

What is CO2?

a)

Carbon Monoxide

b)

Carbon Trioxide

c)

Carbon Dioxide

d)

Oxygen

111.

C6H12O6 is also known as glucose (sugar). Where is it found?

a)

Plants

b)

Animals

c)

Both plants and animals

d)

Neither plants or animals

112.
Which of the following is an example of a decomposer?
a)
Owl
b)
Fish
c)
Tree
d)
Mushroom
113.
Organisms that do not decompose can be buried and become what?
a)
water
b)
nutrients
c)
air
d)
fossil fuels
114.
The diagram shows the flow of organic molecules through an ecosystem. What two processes are identified by the labels X and Y?
a)
X : Respiration
Y : Predation
b)
X : Adaptation
Y : Decomposition
c)
X : Fermentation
Y : Nitrogen Fixation
d)
X : Decomposition
Y : Respiration
115.
What process occurs when coal (fossil fuel) is used for energy?
a)
Decomposition
b)
Combustion
c)
Pressurization 
d)
Respiration 
116.
Respiration is the process by which animals take in _____ and release _____. 
a)
photosynthesis, air
b)
carbon, oxygen
c)
oxygen
d)
oxygen, carbon dioxide
117.
Which of the following removes carbon from the atmosphere?
a)
Combustion
b)
Respiration
c)
Photosynthesis
d)
Death
118.
What does NOT produce carbon dioxide?
a)
Photosynthesis
b)
Burning Fossil Fuels
c)
Animal respiration
d)
Plants decaying
119.

_____ is the conversion of organic nitrogen into ammonia

a)

Nitrogen Fixation

b)

Ammonification

c)

Denitrification

d)

Assimilation

120.

According to this diagram, plants use nitrogen to make _________________________

a)

bacteria

b)

animals

c)

proteins

d)

decomposers

121.

According to this diagram, animals get proteins from eating ________________________

a)

decomposers

b)

bacteria

c)

plants

d)

sunlight

122.

In the nitrogen cycle, what does label A in the diagram represent?

a)

Gas

b)

Clouds

c)

Carbon dioxide in the atmosphere

d)

Nitrogen in the atmosphere

123.
The process where excess nutrients enter a body of water causing overgrowth of aquatic plants and algae...
a)
Eutrophication
b)
Acid Precipitation
c)
Nitrogen Fixation
d)
Decomposition
124.

why do animals and plants need nitrogen?

a)

it helps to synthesize proteins

b)

it helps to synthesize lipids

c)

it helps to synthesize water

d)

it helps to synthesize glucose

125.

What is denitrification?

a)

Conversation of nitrite back to nitrogen gas

b)

Conversation of ammonia back to nitrogen gas

126.

Nitrates are poisonous to fish. What should you add more of to get rid of nitrates without having to change the water in your fish tank?

a)

More fish

b)

Nitrobacter bacteria

c)

Nitrosomonas bacteria

d)

Plants

127.

What would happen to this nitrogen cycle if a virus killed all the bacteria?

a)

Nitrogen would just keep on cycling

b)

The cycle would stop

c)

Plants would take over for the bacteria

d)

Fish would grow more because there's no bacteria

128.
What is this a picture of?
a)
Nitrogen cycle
b)
carbon cycle
c)
water cycle
d)
plant cycle
129.
The process where nitrogen gas is turned in to a form that plants and animals can use is called:
a)
Combustion
b)
Photosynthesis
c)
Decomposition
d)
Nitrogen Fixation
130.
Carbon dioxide is added to the atmosphere by
a)
Burning fossil fuels 
b)
Cellular respiration
c)
Decomposing organic matter
d)
All answers are correct
131.
The nitrogen found in the atmosphere is not in a form that plants or animals can use.  What converts it into a usable form?
a)
Bacteria
b)
Photosynthesis
c)
Decomposition of organisms
d)
Fungi
132.
Identify the cycle pictured.
a)
The Water cycle
b)
The Carbon cycle
c)
The Nitrogen cycle
d)
This is not a correct diagram of any cycle.
133.
What is happening at 1?
a)
respiration: releasing CO2
b)
decomposing CO2 in the soil
c)
photosynthesis: absorbing CO2
d)
turning CO2 from the atmosphere into organic molecules
134.
Which nutrient is not cycled through the atmosphere?
a)
carbon
b)
nitrogen
c)
phosphorous
d)
water
135.
Phosphorus runoff in the water supply can lead to _____________.
a)
phosphorus poisoning of land mammals
b)
deformed fish species
c)
overgrowth of algae, resulting in loss of other aquatic species
d)
Who knows?  Not Me.
136.

Which cycle is shown in this diagram?

a)

Nitrogen

b)

Carbon

c)

Phosphorus

d)

Water

e)

Oxygen

137.

Which cycle is shown in this diagram?

a)

Nitrogen

b)

Carbon

c)

Phosphorus

d)

Water

e)

Oxygen

138.

Which cycle is shown in this diagram?

a)

Nitrogen

b)

Carbon

c)

Phosphorus

d)

Water

e)

Oxygen

139.

Which type of bacteria converts Ammonium to Nitrites and Nitrates?

a)

Nitrifying Bacteria

b)

Decomposers

c)

nitrogen fixing bacteria

d)

denitrifying bacteria

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