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Subjects
Science CBSE
Class 6
Air around us
The air composition and air pollution
11.
Gases used for various processes
Exercise condition:
7
m.
Choose the best option
:
1
.
In which of the following process, air is not needed?
Combustion
Winnowing
Filtration
Respiration
2
.
Which of the following releases oxygen into the atmosphere?
Photosynthesis
Burning
Respiration
None of the above
3
.
The major constituent of gas in the atmosphere is
Carbon dioxide
Nitrogen
Hydrogen
Oxygen
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