EQ: How can
organisms be
classified as singlecelled or
multicellular?
Turn and Talk
What is a cell?
What is an organism?
What is a single-celled organism?
What is a multicellular organism?
Cell Video
Single-Celled Organisms
Organisms made up of only one cell.
Unicellular organisms can do all of the
characteristics of living things: move,
reproduce, grow and develop, adapt
and respond to environment.
Some examples: bacteria, amoeba,
yeast, algae
Multicellular Organisms
Living things (organisms) made up of
more than one cell are multicellular
organisms.
YOU are a multicellular organism!
Turn and Talk:
Can you think of any other multicellular
organisms?
Multicellular Organism
Examples
Plants
Animals
Fungi
Unicellular/Multicellular
Venn Diagram
With your table, complete the Venn
diagram by moving the pieces where
they belong. We’ll check afterwards!
Let’s Compare!
Unicellular Organisms
Multicellular Organisms
Body made up of a single cell.
Body is made up of numerous cells
The single cell can do everything it
needs to do to survive.
Difference cells are specialized to
perform different functions.
The cell body is exposed to the
environment on all sides.
Only outer cells are specialized to
face the environment.
An injury of the cell can cause
death of the organism.
Injury or death of some cells does
not affect the organism because
they can be replaced by new
ones.
Lifespan is short due to heavy load
of work.
Lifespan is longer because work is
divided among different cell types.
Examples: bacteria, amoeba,
algae, yeast
Examples: humans, plants, animals,
fungi
EQA:
How can organisms be
classified as single-celled
or multicellular?