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CO2 Cycle
Test Description: 5.9D
Instructions: Answer all questions to get your test result.
1) Which component do animals add to the atmosphere when they breathe?
A
Hydrogen
B
Carbon dioxide
C
Nitrogen
D
Oxygen
2) When plants make their own food, they add what gas to the atmosphere?
A
Hydrogen
B
Oxygen
C
Carbon dioxide
D
Nitrogen
3) Plants are important to all animals, even animals that eat only meat, because plants provide a resource animals need for -
A
reproduction
B
breathing
C
drinking
D
protection
4) Plants and animals that live on land exchange carbon dioxide and oxygen through the –
A
soil
B
atmosphere
C
ocean
D
food chain
5) What gas would eventually decrease if a large number of plants in a forest habitat were removed?
A
Nitrogen
B
Hydrogen
C
Carbon dioxide
D
Oxygen
6) Plants play a role in the carbon dioxide and oxygen cycle when they absorb -
A
carbon dioxide and give off oxygen
B
hydrogen and give off oxygen
C
oxygen and give off carbon dioxide
D
hydrogen and give off carbon dioxide
7) Carbon dioxide is a gas found in the Earth’s atmosphere. Animals expel carbon dioxide into the atmosphere as part of -
A
respiration
B
feeding
C
growth
D
reproduction
8) What resource, given off by plants as their contribution to the carbon dioxide-oxygen cycle, is necessary for the survival of animals?
A
Carbon dioxide
B
Sunlight
C
Oxygen
D
Water
9) Plants are important to the survival of animals because plants –
A
take in water and nutrients through their roots
B
sometimes use the wind to spread their seeds
C
grow upwards in order to collect sunlight
D
produce oxygen and add it to the atmosphere
10) Huge areas of the Amazon Rainforest are being cut down. What effect could this have on the carbon-dioxide and oxygen cycle if the removal of so many plants and trees continues?
A
Carbon dioxide levels increase
B
Oxygen levels increase
C
Nitrogen levels decrease
D
Carbon dioxide levels decrease
11) The carbon dioxide-oxygen cycle is important to animals because it provides –
A
fresh water for their survival
B
chemicals that build bones
C
energy they need to move
D
a gas they take in when breathing
12) Which of the following could increase the amount of oxygen in the air?
A
Planting more trees
B
Building more houses
C
Burning more oil
D
Paving more streets
13) To give up one thing and replace it with another
A
Oxygen
B
Exchange
C
A. Carbon dioxide
D
Photosynthesis
14) A gas released into the air by plants
A
Photosynthesis
B
Exchange
C
Carbon dioxide
D
Oxygen
15) A gas released into the air by animals
A
Carbon dioxide
B
Photosynthesis
C
Exchange
D
Oxygen
16) A set of events that occurs over and over again
A
Cycle
B
Photosynthesis
C
Exchange
D
Oxygen
17) The process by which plants make their own sugar for food
A
Oxygen
B
Carbon dioxide
C
Exchange
D
Photosynthesis
*select an answer for all questions
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