Class 7 Biology Respiration in Organisms Introduction


All organisms in this vast universe are made up of tiny structural and functional units called cells which perform certain essential functions necessary for sustaining life like nutrition, transport, excretion and reproduction.

But to perform any of these functions the cell requires energy. This energy is derived by the breakdown of the food consumed by us into carbon-dioxide, water and energy. This process is known as respiration. The food has energy stored in it and is released during respiration.


In the above picture it can be easily observed that the energy obtained by consuming the food is used in studying.

Respiration is a biochemical process involving breakdown of glucose in the presence of oxygen resulting in the release of carbon dioxide, water, and ATP also known as the energy currency in cells.

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