Protists: Unicellular Organisms and Their Classification
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Protists are unicellular organisms that
have a nucleus.
Can be classified according to
their
nutrition
:
a.
Animal-like—
heterotrophs
(eat other organisms)
b. Plant-like—
autotrophs
They contain chloroplasts
and make their own food
(photosynthesis).
a.
Fungus-like—
Decomposers
/
Heterotrophs
•
Called Protozoans
•
Unicellular
•
Require water (live in water or moist soil)
•
Most heterotrophic
•
Some photosynthetic
•
Most are free-living
•
Some parasitic
1.
Classified according to the Method of Movement:
a.
Cilia—
hair-like
projections used for movement and
feeding
b.
Cytoplasmic streaming—
pseudopod
(false foot) extends and
cytoplasm
streams into it.
c.
Have a
Flagellum
: a long whip-like structure used for
movement.
d.
all
Sporozans are
parasites(no movements) ,They feed on cells
and body fluids, formed from Spores (tiny reproductive cells).
Unicellular and Multicellular
Colonies (groups of unicellular protists)
Can move on their own
Autotrophs
: make their own food from simple materials
using light energy (photosynthesis).
Pigments
: chemicals that produce color
3.
Unicellular Algae
:
a.
Phytoplankton
provides a source of
nourishment
for other
organisms
b.
b. Protists
recycle
sewage and waste materials.
c.
Algal blooms
are harmful when overgrown—deplete water of
nutrients consequently killing fish.
4.
Multicellular Algae
:
a.
Red Algae
b.
Green Algae
c.
Brown Algae
Heterotrophs
Have cell walls.
Many have flagella and are able to
move at some point in their lives.
Three types: Slime Molds, Water &
Downy Molds
Reproduce with Spores (tiny cell that
is able to grow into a new organism)
a.
Beneficial—
Recycles dead organic material
providing nutrients for plants.
Harmful
Phytophthora
Infestans
(water mold)
caused
Great Potato Famine
in
Ireland
Protozoa
Amoeba
Entamoeba histolytica
Naegleria
Acanthamoeba
Flagellates
Giardia lamblia
Trichomonas vaginalis
Trypanosoma
Leishmania
Ciliates
Balantidium coli
Sporozoa
Plasmodium
Cryptosporidium
Toxoplasma
Protists are diverse unicellular organisms that can be classified based on their nutrition and movement methods. They include protozoans, algae, and heterotrophs like molds, each playing unique roles in ecosystems. From Didinium to multicellular algae, explore the fascinating world of these microscopic creatures.
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Presentation Transcript
By Dr. Hesnaa Saeed Al-Mossawi
Didinium Protists are unicellular organisms that have a nucleus. Can be classified according to their nutrition: a. Animal-like heterotrophs (eat other organisms) b. Plant-like autotrophs They contain chloroplasts and make their own food (photosynthesis). a. Fungus-like Decomposers/Heterotrophs Paramecium Green like plants! Water mold
Called Protozoans Unicellular Require water (live in water or moist soil) Most heterotrophic Some photosynthetic Most are free-living Some parasitic 1. Classified according to the Method of Movement: a. Cilia hair-like projections used for movement and feeding b. Cytoplasmic streaming pseudopod (false foot) extends and cytoplasm streams into it. c. Have a Flagellum: a long whip-like structure used for movement. d. all Sporozans are parasites(no movements) ,They feed on cells and body fluids, formed from Spores (tiny reproductive cells).
Unicellular and Multicellular Colonies (groups of unicellular protists) Can move on their own Autotrophs: make their own food from simple materials using light energy (photosynthesis). Pigments: chemicals that produce color 3. Unicellular Algae: a. Phytoplankton provides a source of nourishment for other organisms b. b. Protists recycle sewage and waste materials. c. Algal blooms are harmful when overgrown deplete water of nutrients consequently killing fish. 4. Multicellular Algae: a. Red Algae b. Green Algae c. Brown Algae
Heterotrophs Have cell walls. Many have flagella and are able to move at some point in their lives. Three types: Slime Molds, Water & Downy Molds Reproduce with Spores (tiny cell that is able to grow into a new organism) Beneficial Recycles dead organic material providing nutrients for plants. Harmful Phytophthora Infestans (water mold) caused Great Potato Famine in Ireland a.
Protozoa Amoeba Entamoeba histolytica Naegleria Acanthamoeba Flagellates Giardia lamblia Trichomonas vaginalis Trypanosoma Leishmania Ciliates Balantidium coli Sporozoa Plasmodium Cryptosporidium Toxoplasma
