WorksheetsOxygen cycle
Total questions: 14
Worksheet time: 11mins
Name
Class
Date
1.
The movement of carbon dioxide and oxygen on Earth by the processes of respiration and photosynthesis.
a)
Carbon Dioxide-Oxygen Cycle
b)
Oxygen
c)
Carbon Dioxide
d)
Respiration
2.
A gas produced by plants during photosynthesis that animals use for respiration.
a)
Oxygen
b)
Carbon Dioxide
c)
Methane
d)
Sulphur
3.
A gas produced by animals during respiration that plants use for photosynthesis.
a)
Oxygen
b)
Carbon Dioxide
c)
Photosynthesis
d)
Radiation
4.
A process by which animals use oxygen and food to make energy and carbon dioxide.
a)
Respiration
b)
Photosynthesis
c)
Running
d)
Carbon
5.
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
6.
Approximately how much oxygen is composed in our atmosphere
a)
10
b)
32
c)
21
d)
70
7.
What gas is released by plants during photosynthesis?
a)
sulfur
b)
carbon dioxide
c)
oxygen
d)
hydrogen
8.
Plants need ________ for photosynthesis
a)
oxygen
b)
soil
c)
carbon dioxide
d)
sugar
9.
What plant part carries out photosynthesis?
a)
Leaf
b)
Stem
c)
Roots
d)
Flower
10.
Which answer best defines chlorophyll?
a)
the green substance in plant leaves that captures energy from the sun
b)
living things
c)
a gas in the atmosphere that plants use during the process of photosynthesis
d)
the process in which plants use energy from
12.
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.
12.
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.
13.
What is respiration?
a)
the transfer of oxygen and carbon into the atmosphere
b)
the movement of water vapor in the atmosphere
c)
the flow of oxygen within the body
d)
process that uses oxygen and releases carbon dioxide
14.
what other process adds oxygen into the atmosphere
a)
photdissociation
b)
carbonation
c)
oxidization
d)
evaporation
100 %
