In respiration glucose and oxygen combine together to form

The process of trapping some of the heat from the sun to maintain the life on earth is known as

People having respiratory problems like asthma, are dosed medically with

Oxygen is used in the manufacture of

Respiratory system contains organs necessary for the process of

The left over gas after the process of combustion is generally

The sphere that prevent the ultraviolet rays from sun is known as

In humid areas, the water vapor content is

The percentage composition of oxygen in air is

Air is important on earth because it has necessary components essential for the life of

An odorless, invisible gas that makes about 20%-22% of the earth's atmosphere is known as

A thin layer that is held in place by gravity and provides us with oxygen is known as

The percentage composition of nitrogen in air is

The second step of fractional distillation is heating the mixture so that components evaporate at their

In respiration, living organisms take in oxygen and give out

Air present in 100cm³ of water is about

The breathing system of plants is present in

The fractional distillation is a process in which liquids evaporate at

Photosynthesis occurs during the

Oxygen gas is