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Biochemical cycles

Total questions: 50

Worksheet time: 47mins

Name
Class
Date
1.
When humans burn fossil fuels, most of the carbon quickly enters the                       as carbon dioxide.
a)
Water
b)
Atmosphere
c)
Sun
d)
Air
2.
How do living organisms return carbon to the atmosphere in the carbon cycle?
a)
respiration and photosynthesis
b)
 decomposition and respiration
3.
Organisms that do not decompose can be buried and become what?
a)
water
b)
nutrients
c)
air
d)
fossil fuels
4.

With the help of the Sun, through the process of photosynthesis, carbon dioxide is pulled from the air to make plant________

a)

leaves

b)

food

c)

roots

d)

nutrients

5.

Through food chains, the carbon that is in plants moves to the animals that eat them. When an animal eats another animal, carbon is ___________________.

a)

released

b)

transferred

c)

dissolved

d)

gone

6.

Which process contributes carbon dioxide to the atmosphere?

a)

respiration

b)

photosynthesis

c)

tree farms

7.

Which process removes carbon dioxide from the atmosphere?

a)

deforestation

b)

tree farms

c)

burning fossil fuels

d)

cellular respiration

8.

Which of the following is correct?

a)

There is as much carbon on earth as when it was formed

b)

Carbon is being created whenever it is recycled

c)

Carbon is lost every time it is recycled

d)

Carbon changes to different forms and is never recovered

9.

What is the greatest contributor to atmospheric carbon?

a)

burning garbage

b)

burning biomass

c)

transportation

d)

household usage

10.
Carbon can be found in...
a)
The atmosphere
b)
Soil
c)
Fossil fuels
d)
All of the above
11.
Which of the following removes carbon from the atmosphere?
a)
Combustion
b)
Respiration
c)
Photosynthesis
d)
Death
12.
What are the products of photosynthesis?
a)
water and carbon dioxide
b)
oxygen and glucose
c)
oxygen and carbon dioxide
d)
oxygen and water
13.
Which of the following is the correct equation for PHOTOSYNTHESIS?
a)

CO2 +light+H2O --> O2 + glucose

b)

CO2 + glucose + H2O --> O2 + light

c)

O2 + light + H2O --> CO2 + Glucosg

d)

CO2 + O2 + H2O --> Light+ glucose

14.
How 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
15.
Organisms that need nitrogen to survive
a)
only plants
b)
only animals
c)
only bacteria
d)
all living organisms
16.
Organisms that play a role in the nitrogen cycle
a)
only plants
b)
only animals
c)
only bacteria
d)
plants, animals, & bacteria
17.
Bacteria fix nitrogen on plant roots. Plant roots provide sugar to bacteria. This is an example of
a)
mutualism
b)
parasitism
c)
commensalism
d)
competition
18.
All plants have nitrogen fixing nodules on their roots.
a)
True
b)
False
19.
Nitrogen rich fertilizers and manure can cause water pollution.
a)
True
b)
False
20.
How nitrogen is "fixed" into useable form for plants
a)
only through action of bacteria
b)
only through lightning
c)
through action of bacteria & lightning
d)
through photosynthesis
21.
Organism that breaks down dead plants & animals and releases nitrogen back into atmosphere
a)
bacteria
b)
plants
c)
animals
d)
producers
22.
How plants get the nitrogen they need
a)
from the air
b)
from the soil or water in which they live
c)
from the Sun
d)
from broken down rocks
23.
Gas that makes up almost 80% of Earth's atmosphere
a)
oxygen
b)
carbon dioxide
c)
nitrogen
d)
hydrogen
24.

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

25.

The image shows various stages in the water cycle. During which stage does water flow back towards the sea as runoff?

a)

W

b)

X

c)

Y

d)

Z

26.

What is precipitation?

a)

Sweat from our bodies on hot days

b)

Warm rain but not cold snow or sleet

c)

Gas that we use in furnaces or ovens

d)

Any form of water that falls from the sky

27.

Condensation occurs when water vapor_____________.

a)

heats up and becomes liquid water

b)

cools off and becomes liquid water

c)

freezes and becomes ice

d)

rains on the land

28.

The process when plants release water vapor from their leaves is called _____________.

a)

precipitation

b)

evaporation

c)

transpiration

d)

condensation

29.
What step of the water cycle occurs when clouds become too heavy? 
a)
Condensation
b)
Runoff
c)
Precipitation
d)
Evaporation
30.
What is the process during which water cools and turns from a gas to a liquid?
a)
Condensation
b)
Runoff
c)
Precipitation
d)
Evaporation
31.

What step of the water cycle does this picture show?

a)

Condensation

b)

Runoff

c)

Precipitation

d)

Evaporation

32.

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

33.
What source of energy evaporates the most water from Earth’s surface?
a)
volcanoes
b)
the sun
c)
lightning
d)
wind
34.

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

a)

water table

b)

water cycle

c)

aquifer

d)

Infiltration

35.

Water running off the land surface

a)

Evaporation

b)

Sublimation

c)

Transpiration

d)

Run-off

36.

What are formed when water vapor condenses and come together?

a)

Clouds

b)

Mountains

c)

Transpiration

d)

Valleys

37.
What is the role of decomposers in an Ecosystem? 
a)
They recycle matter and nutrients to form fossil fuels
b)
They are burn and release as carbon dioxide
c)
Decomposers are responsible to turn oxygen into carbon dioxide
d)
They recycle energy back to the sun
38.
Phosphorous is passed from plants to ____ who eat them
a)
plants
b)
animals
c)
scavengers
39.
_____ brings phosphorous into our waterways. .
a)
precipitation
b)
runoff
c)
transpiration
d)
condensation
40.
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.
41.
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
42.
This is released by the weathering of rocks.
a)
Carbon
b)
Oxygen
c)
Phosphorus
d)
Nitrogen
43.

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

a)

eutrophication

b)

Nothing

c)

Death

d)

diseases

44.

An algal bloom is the rapid growth of a population of

a)

fungi

b)

protozoans

c)

algae

45.

Organisms that break down dead plants & animals and release nitrogen back into atmosphere...

a)

bacteria

b)

plants

c)

animals

d)

producers

46.

All living organisms are mainly composed of what elements?

a)

Oxygen, Carbon, Hydrogen, Nitrogen

b)

Carbon, Phosphorus, Nitrogen, Oxygen

c)

Sodium, Carbon, Nitrogen, Hydrogen

d)

Calcium, Phosphorus, Nitrogen, Oxygen

47.

Which of the following is NOT true of phosphorus and the phosphorus cycle?

a)

Phosphorus is mined from phosphorus rich rock, which is processed and then added to commercial inorganic fertilizers as well as detergents.

b)

Phosphorus tends to be more localized compared with other biogeochemical cycles that can move more freely in the global system.

c)

Phosphorus is generally found in rocks, sediments, and soil.

d)

Phosphorus does not exist in the atmosphere as a gas.

e)

Living organisms do not need phosphorus.

48.

Phosphorus is mainly found (stored) in the atmosphere.

a)

True

b)

False

49.
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.
50.
Identify the cycle pictured.
a)
The Water cycle
b)
The Carbon cycle
c)
The Nitrogen cycle
d)
The Phosphorus cycle.

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