Gas exchange takes place in plants using ___________.
a. Stomata
The constituent of air that supports combustion is __________.
c. Oxygen
Nitrogen is used in the food packaging industry because it _________.
d. keeps the food fresh
_______ and ______ are the two gases, which when taken together, make up about 99 percentage of air.I.Nitrogen II. carbon-di-oxide III. Noble gases IV. Oxygen
d. I and IV
__________ is the active component of air.
Oxygen
The gas given out during photosynthesis is _________.
Oxygen
__________ gas is given to the patients having breathing problems.
Oxygen
_______ can be seen moving in a beam of sunlight in a dark room
Dust particles
________ gas turns lime water milky.
Carbon dioxide
Inhaled air contains a large amount of carbon-di-oxide.
False
Planting trees help in decreasing global warming
True
The composition of air is always exactly the same.
False
Whales come up to the water surface to breathe in oxygen.
True
The balance of oxygen in atmosphere is maintained through photosynthesis in animals and respiration in plants.
False
Moving Air
Wind
Layer in which we live
Troposphere
Stratosphere
Ozone layer
Oxygen
Combustion
carbon-di-oxide
Photosynthesis
Photosynthesis : _____ :: Respiration : Oxygen
carbon dioxide
78% of air : Does not support combustion :: _____ : Supports combustion