Which of the following gas is used for filling weather balloons?
a) CO2
b) Oxygen
c) Argon
d) Helium
Fish exchange oxygen and carbon dioxide through gills in………………..
a) Liquid
b) material
c) Water
d) Solution
Thick blanket of air around the Earth is……....
a) Earth cover
b) atmosphere
c) wind
d) Earth’s coat
We can produce a lot of urea fertilizer because:
a) there is oxygen in the air
b) there is a lot of nitrogen in the air
c) there is carbon dioxide in the air
d) there is water in the air
During the space journeys, rockets use:
a) liquid oxygen
b) liquid nitrogen
c) liquid hydrogen
d) liquid CO2
We want our bun to fluffy. Which gas can help us?
a) nitrogen
b) oxygen
c) carbon dioxide
d) helium
