Types of
Organisms
Unicellular Organisms
vs.
Multicellular Organisms
Unicellular
Organisms
Unicellular Organisms
Definition:
Unicellular organism – an organism made of
only one cell
Information:
These organisms are very small and need to
be seen with a microscope.
Examples of
Unicellular Organisms
 Amoeba
 Unicellular
fungi
 Bacteria
 Unicellular
yeasts
 Protozoa
 Paramecium
 Unicellular
algae
Unicellular Organisms
 Benefits

They can
reproduce faster
 Characteristics




Offspring are
identical to each
other and to
parent(s)
They are not as
complex
Do NOT have cell
differentiation
They tend have
shorter lives than
multicellular
organisms
Images of Unicellular Organisms
Multicellular
Organisms
Multicellular Organisms
Definition:
Multicellular organism – an organism made of
two or more cells
Information:
 These
organisms are able to be seen with the
naked eye.
 These
organisms need all parts of themselves
to survive. (with few exceptions)
Common Names
 Many
– celled organisms
 Mammals
 Birds
 Reptile
 Fish
Examples of Multicellular
Organisms
 Humans
 Birds
 Cats
 Flowers
 Dogs
 Mold
 Insects
 Trees
Images of Multicellular
Organisms
Multicellular Organisms
 Benefits


They are able to
adapt (have
different traits)
They DO have cell
differentiation
 Characteristics



They consist two or
more cells
They are able to
grow large
Tend to be more
complex than
unicellular
organisms
Exit Slip
 1)
Identify the multicellular organism:
a) All algae
b) Sunflower
c) Amoeba
d) Bacteria
 2) Analyze which image is an unicellular
organism:
A
B
C
D