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Biogeochemical Cycles

Total questions: 37

Worksheet time: 43mins

Name
Class
Date
1.

Label the nitrogen cycle processes

a)

Denitrification

b)

Assimilation

c)

Nitrogen Fixation

d)

Ammonification

e)

Nitrification

1
2
3
4
5
1)
2)
3)
4)
5)
2.

What converts nitrogen gas into a usable form for plants and animals?

a)

bacteria

b)

rain

c)

fungi

d)

car exhaust

3.

Organisms that need nitrogen to survive.

a)

only plants

b)

only animals

c)

only bacteria

d)

all living things

4.

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

5.

How do animals get the nitrogen they need?

a)

From the air they breathe

b)

From the water they drink

c)

From the food they eat

d)

From the sun

6.

What is the process of combining nitrogen gas with other elements to make nitrogen into usable compounds?

a)

nitrogen composition

b)

nitrogen fixation

c)

ammonia

d)

denitrification

7.

What is the formula for atmospheric nitrogen?

a)

N

b)

N2

c)

NH3

d)

NO3

8.

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

9.

Plants and animals cannot use nitrogen directly from the air.

a)

True

b)

False

10.

Match the following steps of the nitrogen cycle to how they move bacteria.

a)

Atmosphere to Geosphere

1.

Nitrogen Fixation

b)

Geosphere to Biosphere

2.

Assimilation

c)

Biosphere to Geosphere

3.

Ammonification

d)

Geosphere to Atmosphere

4.

Denitrification

11.

Label the phosphorus cycle

a)

Deposition

b)

Leaching

c)

Erosion

d)

Weathering of rock

e)

Fertilizers

f)

Animal waste

g)

Decomposition

1
2
3
4
5
6
7
1)
2)
3)
4)
5)
6)
7)
12.

This is NOT a part of the phosphorus cycle.

a)

Phosphate is incorporated into sedimentary rocks

b)

Phosphate bound to soil

c)

Atmospheric phosphate

d)

Phosphate is absorbed from the soil by plants

13.
Phosphorous is passed from plants to ____ who eat them
a)
plants
b)
animals
c)
scavengers
14.
_____ brings phosphorous into our waterways. .
a)
precipitation
b)
runoff
c)
transpiration
d)
condensation
15.
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.
16.
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
17.
This is released by the weathering of rocks.
a)
Carbon
b)
Oxygen
c)
Phosphorus
d)
Nitrogen
18.
Which nutrient is not cycled through the atmosphere and stays only on ground level?
a)
carbon
b)
nitrogen
c)
phosphorus
d)
water
19.

Too much phosphorus in waterways (rivers, lakes) can lead to___________.

a)

eutrophication

b)

Nothing

c)

Death

d)

diseases

20.

An algal bloom is the rapid growth of a population of

a)

fungi

b)

protozoans

c)

algae

21.
When water is heated in the ocean by the sun and turns into water vapor
a)
condensation
b)
evaporation
c)
transpiration
d)
runoff
22.
The ________ is the driving force of the earth's surface.
a)
sun
b)
moon 
c)
stars
23.

An underground layer of sand, gravel or rock that stores and carries water

a)

water table

b)

water cycle

c)

aquifer

d)

Infiltration

24.

In which area would the rate of evaporation be the lowest?

a)

Over the ocean

b)

Over the mountains

c)

Over the rainforest

d)

Over the desert

25.

Which best explains why runoff is important?

a)

It returns water to other locations on Earth

b)

It increases the chance of flooding

c)

It makes evaporation occur faster

d)

It increases condensation

26.

As a part of the water cycle, water from Earth's surface enters the clouds and finally falls back to the ground in the form of rain. What is the correct sequence of processes water undergoes?

a)

Evaporation, Condensation, Precipitation

b)

Precipitation, Condensation, Evaporation

c)

Condensation, Evaporation, Precipitation

d)

Evaporation, Precipitation, Condensation

27.

Organisms that do not decompose naturally can be buried and become what?

a)

oxygen

b)

nutrients

c)

calcium carbonates

d)

fossil fuels

28.

If the plant population decreased, the amount of carbon dioxide in the atmosphere would _________.

a)

Stay the same

b)

Increase

c)

Decrease

29.
Combustion is another word for __________.
a)
Transportation
b)
Respiration
c)
Fossil Fuels
d)
Burning
30.
What are the end products of cellular respiration? 
a)
Carbon dioxide, water and ATP energy
b)
Carbon dioxide, glucose and water
c)
Oxygen, glucose and ATP energy
d)
Water, Carbon dioxide and Oxygen
31.

How does the human body return carbon to the atmosphere in the carbon cycle?

a)

Waste products

b)

Photosynthesis

c)

Cellular respiration

d)

Formation of glucose

32.

In the carbon cycle, animals can release carbon back into the cycle through __________ or through __________.

a)

burning . . . photosynthesis

b)

fixation . . . decomposition

c)

decomposition . . . photosynthesis

d)

respiration . . . decomposition

e)

respiration . . . photosynthesis

33.

If a forest fire occurs, what will happen to the carbon in the forest?

a)

It will go into the soil

b)

It will go into the atmosphere

c)

It will runoff into nearby streams and rivers

d)

It will be destroyed

34.

Check all the ways that carbon dioxide is ADDED to the atmosphere.

a)

Respiration

b)

Combustion

c)

Photosynthesis

d)

Diffusion

e)

Decomposition

35.

Check all the ways that carbon dioxide is REMOVED from the atmosphere.

a)

Respiration

b)

Combustion

c)

Photosynthesis

d)

Diffusion

e)

Decomposition

36.

What are the two main reservoirs for carbon dioxide?

a)

Ocean, fossil fuels

b)

Ocean, atmosphere

c)

Atmosphere, fossil fuels

d)

Calcium Carbonate, ocean

37.

Which of the following is a major carbon sink?

a)

Ocean

b)

Atmosphere

c)

Calcium Carbonate

d)

None of the above

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