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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
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