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Unicellular
organism
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Multicellular
organism
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1.
Body is made up of
single cell
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Body is made up of
numerous cells
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2.
Division of labour
is at the organelle level. It gives a low level of operational efficiency
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Division of labour
may be at cellular, tissue, organ and organ system level. It gives high
degree of operational efficiency
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3.
A single cell
carries out all the life processes
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Different cells are
specialized to perform different functions
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4.
The cell body is
exposed to the environment on all sides
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Only outer cells are
specialized to face the environment. Inner cells are devoted to other
functions
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5.
An injury of the
cells can cause death of the organism.
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Injury or death of
some cells does not affect the organisms as the same can be replaced by new
one.
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6.
A cell body cannot
attain a large size because of the limit imposed by surface area to volume
ratio
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A multicellular body
can attain a large size increasing the number of small cells
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7.
Lifespan is short
due to heavy load of work
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Lifespan is long due
to limited load of work for each cell type
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8.
Power of division is
not lost
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Certain specialized
cells lose power of division
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9.
A well-marked
capacity of regeneration is present
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The capacity of
regeneration decreases with increasing specialization
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10.
The cell has the
same role for itself and the organism
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Cells have a double
role. One for themselves and other for the organism
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