Unicellular and Multicellular
Organisms
Unicellular Organisms
 Unicellular organism are one celled living
things.
 Algae are one celled organisms that contain
chlorophyll, and live on or near the surface.
 Algae produce most of the O2 that we
breathe.
 Algae are microscopic and can not be seen
by the naked eye.
 The most common forms of Algae are:
 Diatoms- make their own food (photosynthesis)
 Dinoflagellates- can both make their own food
and get food from other sources
Diatoms and Dinoflagellates
Multicellular Algae
 Seaweed are the most common form of
multicellular algae.
 There are three types of Seaweed:
 Red
 Brown
 Green
 Seaweed has leaves for photosynthesis,
stems for transport, and roots for absorbing
water.
 Seaweeds are vascular plants.
 There are many species of seaweed and
each has its own special adaptation for
survival.
Seaweeds
Summary
 Algae produces most of the oxygen that we
breathe.
 Multicellular algae, or seaweed, is classified
in three colors: red, green, and brown.
 Unicellular Algae is broken down into two
groups Diatoms and Dinoflagellates.
 All of these organisms have special and
unique adaptations that enable them to
survive their environments.
 Plankton is a combination of uni and
multicellular algae and forms the basis of all
life in the ocean.
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