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WorksheetsAIR: Carbon Cycle & Oxygen Cycle
Total questions: 25
Worksheet time: 25mins
Name
Class
Date
1.
The carbon dioxide-oxygen cycle is best defined as-
a)
the process in which plants use energy from the sun to make their own food
b)
a green substance in plant leaves that captures energy from the sun
c)
living things
d)
the movement of carbon dioxide and oxygen between organisms and the air
2.
When humans burn fossil fuels, most of the carbon quickly enters the as carbon dioxide.
a)
Water
b)
Atmosphere
c)
Sun
d)
Air
3.
Which one of these does not add CO2 to the atmosphere?
a)
cooking with gas
b)
planting trees
c)
burning wood
d)
riding in a bus
4.
Combustion is another word for _______________.
a)
a train
b)
a bus
c)
a dog
d)
burning
5.
What does not produce carbon dioxide?
a)
Photosynthesis
b)
Burning Fossil Fuels
c)
Animal respiration
d)
Plants decaying
6.
How do living organisms return carbon to the atmosphere in the carbon cycle?
a)
respiration and photosynthesis
b)
decomposition and respiration
7.
In the carbon cycle, producers take in the gas __
a)
carbon dioxide
b)
oxygen
c)
nitrogen
d)
carbon monoxide
8.
In what process is Carbon transformed into chemical energy?
a)
Photosynthesis
b)
Respiration
c)
Primary Production
d)
Secondary Production
9.
What does an "exchange of gases" mean?
a)
It means that gases are apart of everything.
b)
It means that orange juice is an upside down milkshake with a missing tail.
c)
It means that humans and plants trade gases back and forth.
d)
It means that carbon in apart of all living things.
10.
Why is the CO2 and O2 cycle considered to be a cycle?
a)
there is a exchange of gases
b)
the trees use it and trees are apart of all cycles
c)
there is a continuous exchange of gases
11.
Which statement is true about the carbon dioxide-oxygen cycle?
a)
animals breathe in nitrogen and release oxygen which is used by plants
b)
animals breathe in oxygen and release carbon dioxide which is used by plants
c)
animals breathe in nitrogen and release carbon dioxide which is used by plants
d)
animals breathe in carbon dioxide and release oxygen which is used by plants
12.
If all the trees on Earth were destroyed, what would be the effect on humans?
a)
there would be a lack of food
b)
there would be a lack of oxygen
c)
there would be a lack of fresh water
d)
there would be a lack of carbon dioxide
13.
The class decided to have a terrarium. The teacher says it is important to include both plants and animals. Why is it necessary to include both plants and animals?
a)
plants provide food for the animals and animals provide water for the plants
b)
plants provide water for the animals and animals provide food for the plants
c)
plants provide carbon dioxide for the animals and animals provide oxygen for the plants
d)
plants provide oxygen for animals and the animals provide carbon dioxide for the plants
14.
Animals and plants use substances that cycle through the environment. Which substance is needed by plants to survive and is released into the environment by animals?
a)
oxygen
b)
sugar
c)
salt
d)
carbon dioxide
15.
The CO2/O cycle is important to animals because it provides
a)
a gas they take in when breathing
b)
chemicals that build bones
c)
energy they need to move
d)
fresh water for their survival
16.
________________ could increase the amount of oxygen in the air.
a)
Building more houses
b)
Burning more oil
c)
Paving more streets
d)
Planting more trees
17.
Plants use _____________ to make their own food during photosynthesis.
a)
water
b)
energy from the Sun
c)
CO2
d)
water, energy from Sun, CO2
18.
What causes an increase in the oxygen level in the atmosphere?
a)
Oxygen inhaled by animals.
b)
Oxygen released by animals.
c)
Oxygen released by plants.
d)
Oxygen taken in by animals.
19.
How plants and animals interact in the CO2/O cycle?
a)
Plants release O into the atmosphere which animals inhale. Animals exhale CO2 into the atmosphere which is breath in by plants.
b)
Animals release O into the atmosphere which plants inhale. Plants exhale CO2 into the atmosphere which is breath in by animals.
c)
Plants and animals don't need each other.
d)
Plants and animals take in O and release CO2.
20.
If the Sun stop shinning, plants and animals would not survive because ___________________.
a)
Plants use the Sun's energy and oxygen to make glucose, which animals eat.
b)
Plants use the Sun's energy and CO2 to make glucose, and release O that animals breathe.
c)
Plants use the Sun's energy to make CO2 and release glucose.
d)
Plant use the Sun's energy to make water and release O that animals breathe in.
21.
Which answer best defines photosynthesis?
a)
the movement of carbon dioxide and oxygen between organisms and the air
b)
Tiny holes in the leaves of a plant that allow gases to enter or leave the plant
c)
the process in which plants use energy from the sun to make their own food
d)
a gas in the atmosphere that plants use to make food
22.
In the CO2/O cycle arrows in a diagram represents __________.
a)
The cycling of water through the environment.
b)
The cycling of nitrogen through the environment.
c)
The cycling of CO2 and O through the environment.
d)
The cycling of energy through nonliving parts of the environment.
23.
Which statement is an example of how plants and animals depend on each other?
a)
animals provide food for plants
b)
animals provide water for plants
c)
animals provide oxygen for plants
d)
animals provide carbon dioxide for plants
24.
What is the action of breathing called?
a)
Respiration
b)
Breathing
c)
Inhaling
d)
Exhaling
25.
Oxygen is a gas produced by _ and used by _
a)
plants and animals
b)
photosynthesis and carbon dioxide
c)
animals and plants
d)
carbon dioxide and photosynthesis
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