Protists are a diverse group of eukaryotic organisms that are either photosynthetic like plants, heterotrophic like animals, or decomposers like fungi. They include algae, protozoa, and other microscopic organisms. Protists can be autotrophic using photosynthesis or heterotrophic ingesting other organisms. They play important roles in ecosystems as producers, consumers, and decomposers and are foundational to many food webs. However, some protists are also pathogens that can cause diseases.

1. Kingdom Protista

2.  If you look at a drop of pond water under a
microscope, all the "little creatures" you
see swimming around are protists.

3.  All protists have a nucleus and are
therefore eukaryotic.
 Protists are either plant-like, animal-like or
fungus-like.

4. Three Types of Protists
 Plant-like protists are autotrophs
 Animal-like and fungus-like protists and
are heterotrophs.

5.  Protozoans are animal-like protists
(heterotrophs) grouped according to how
they move.
 The word protozoa means "little animal.“
 One group of animal-like protists are
amoebas.
Animal-like Protists

7. 7.
Contractile Vacuole
Ectoplasm
Endoplasm
Nucleus
Food Vacuole
Cell
Membrane
Pseudopod

8.  The second group is the Flagellates <flah-
geh-lets>, of the phylum Zoomastigina.
Flagellates are generally the smallest of
the protozoa and have one or several
long, whip-like projections called flagella
poking out of their cells.
 Flagellates use their flagella to move.
Flagellates

9. Giardia

10.  The third group of protozoans are the
ciliates from the phylum Ciliophora. These
are generally the largest protozoa.
 They are covered with hair-like projections
called cilia and they eat the other two
types of protozoa as well as bacteria.
 Ciliates are found in every aquatic habitat.
Ciliates

12. 8. Cilia
9. Contractile Vacuole
15. Contractile Vacuole
10. Food Vacuole
11. Macronucleus
12. Micronucleus
13. Oral Groove
14. Cytoplasm
16. Cell Membrane

13. How do Protozoans reproduce?
 Asexual – Binary fission
 Sexual - Conjugation

14.  The last of the Protozoans come from the
phylum, Sporozoa.
 These are parasitic and nonmotile.
 For example……
Sporozoa

16.  Plant-like protists are algae.
 Algae are eukaryotic autotrophs.
 They, along with other eukaryotic
autotrophs, form the foundation of Earth’s
food chains.
 They produce much of Earth’s oxygen.
Algae

17.  There are three unicellular phyla of algae:
 Phylum Euglenophyta
 Phylum Bacillariophyta
 Phylum Dinoflagellata

18.  Members of first phylum of algae,
Euglenophyta, are both plant-like and animal-
like.
 Euglena are autotrophs since they make food
from sunlight
 Heterotrophs since they ingest food from
surrounding water.
Euglena

20. Euglena
Flagella
Eyespot
Contractile Vacuole
Chloroplasts
Nucleus
Cytoplasm
Contractile Vacuole

21.  The third unicellular algae, Dinoflagellata, are
a major component of marine phytoplankton.
 These algae have at least two flagella set at
right angles to each other and thick cell walls
made of cellulose plates.
 Blooms of dinoflagellates cause “Red Tide.”
Dinoflagellates

26.  They are in many
food chains & food
webs.
 Plant-like ones
provide oxygen as
well as food.
 Fungi-like ones help
as decomposers
(recycle).
 Some cause diseases