Oxygen cycle

Nature has provided us with various valuable resources.

One such valuable element of nature is oxygen.

A total of 21% of oxygen is present in the atmosphere.

It supports all life forms on land, air, and water.

Oxygen is produced by the plants and released into the atmosphere.

The oxygen released needs to be circulated to all the organisms.

To fulfill this need, nature has developed a system known as the oxygen cycle.

The cycle starts with the release of oxygen by plants.

The living organism picks up the oxygen, breaks the food and releases carbon dioxide.

The released carbon dioxide is picked by the plants.

Animals take in oxygen for respiration and release carbon dioxide.

The oxygen released by the plants supports combustion (burning in presence of oxygen) which releases carbon dioxide.

All the carbon dioxide released is a waste and we need to get rid of it.

Plants help us to do this.

Carbon dioxide combines with water and produces glucose and oxygen.

Glucose is the food for plants while oxygen is a waste. So it is released into the atmosphere.

This process of circulation and renewal of oxygen is known as .

Oxygen is a very reactive gas and exists freely in nature.

It combines with metals like iron to form rust.

It also combines with nitrogen and other elements to form oxides.

Oxygen atoms combine to form the ozone layer in the atmosphere.

Revision

Plants provide us with oxygen which is used for respiration and carbon dioxide is released.

Substances burn in the presence of oxygen and release carbon dioxide in the air.

Plants use carbon dioxide for photosynthesis and release oxygen as a waste product back to the atmosphere.

This process of circulation and renewal of oxygen is known as the oxygen cycle.

The End.