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Middle School: 6th, 7th and 8th Grade
Science
Respiration 1
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Q.1
The percentage of oxygen in the air breathed in is .......
0%
0.03%
0%
1%
0%
21%
0%
79%
Q.2
The percentage of oxygen in the air breathed out is .......
0%
4%
0%
16%
0%
21%
0%
79%
Q.3
The percentage of carbon dioxide in inhaled air is .......
0%
0.03%
0%
4%
0%
21%
0%
79%
Q.4
The percentage of carbon dioxide in exhaled air is .......
0%
4%
0%
16%
0%
21%
0%
79%
Q.5
The percentage of which gas remains unchanged?
0%
Carbon dioxide
0%
Nitrogen
0%
Oxygen
0%
Water vapor
Q.6
Which is the correct order showing how oxygen enters the blood?
0%
Alveoli, bronchioles, bronchi, trachea
0%
Bronchi, bronchioles, trachea, alveoli
0%
Trachea, alveoli, bronchi, bronchioles
0%
Trachea, bronchi, bronchioles, alveoli
Q.7
Gas exchange takes place in the alveoli. Which is not true?
0%
The alveoli have a moist surface
0%
The alveoli have a small surface area
0%
The alveoli have a very good blood supply
0%
The alveoli have very thin permeable walls
Q.8
Oxygen passes from the alveoli into the blood. How is it transported?
0%
By blood plasma
0%
By dissolving in water
0%
By red blood cells
0%
By white blood cells
Q.9
Carbon dioxide passes into the alveoli from .......
0%
arteries
0%
blood plasma
0%
platelets
0%
white blood cells
Q.10
Air can enter and leave the lungs because .......
0%
of pressure changes
0%
the volume of the thorax (chest) remains the same
0%
there is gas exchange
0%
there is no pressure change
0 h : 0 m : 1 s
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