Everything needs energy to do some job e.g. to
operate machines, electricity, steam, fuels like coal, petrol, wood etc are
burned to get energy. Similarly, living organisms require energy to carry out
their diverse activities of life. They maintain the complex structure of cells,
excrete waste material, and reproduce for continuation of their race. They grow
in size during their life span as they are small when born and are large when
adult. A considerable amount of energy is required to carry out the functions
of life. The organisms, therefore, need to have some source of energy in order
to maintain their life. Organisms get their energy from food. The type of food
depends upon the kind of organism using the food. Some organisms use inorganic compounds
to get their energy requirements. Some organisms use vegetables (plants) while
some others require flesh (animals) as their food.
The organisms burn up their food (metabolize) to get a special form of energy
called ATP (Adenosine triphosphate) which is used by them to carry out their
functions of life.
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