PROTISTS
PROTIST’S
What are Protists
• Any group of EUKARYOTIC
organisms belonging to the
kingdom Protista.
• Signal- celled organisms
PROTISTS live
in WATERY or MOIST
environments.
Adaptations
Some protists, including paramecium and amoeba,
have a Contractile Vacuole.
This structure is used for water regulation,
pumping out excess water.
3 types of movement
• Flagella
• Cilia
• Pseudopod
Adaptations
• Protists have adaptive structures for movement
including Cilia, Pseudopodia, and Flagella
Paramecium movement using cilia:
http://www.youtube.com/watch?v=HXcEAC
Qv5-8
Amoeba movement using pseudopods:
http://www.youtube.com/watch?v=PsYpngBG394
http://www.youtube.com/watch?v=-uxWx6bnQ4Y
Euglena movement using flagella:
http://www.youtube.com/watch?v=7DALQ-XLJ4Q
Something cool : Euglena is a dietary supplement in the powder form.
Adaptations
• Some protists are AUTOTROPHS,
they manufacture their own energy through
photosynthesis or chemosynthesis.
•Euglena have an EYESPOT: a photoreceptive
organelle that allows the cells to sense LIGHT direction
and intensity and respond to it by swimming either
towards the light (positive phototaxis) or
away from the light (negative phototaxis).
Positive Phototaxis
Their EYESPOT draws them towards sunlight so their CHLOROPLASTS can
make food. (photosynthesis).
Euglena are autotrophic AND….
Chemotaxis :Movement of organism
toward or away from a chemical stimuli.
• Euglena, and Amoeba are heterotrophic:
they get their energy by consuming other organisms
Start here
http://www.youtube.com/watch?v=qpw2p1x9Cic
•Amoeba ENDOCYTOSIS:
phagocytosis = solid food
pinocytosis = liquid food
http://www.youtube.com/watch?v=W6rnhiMxtKU
Paramecium are also heterotrophic. They get nutrition
by sweeping food into their gullet, using digestive
enzymes, and then exocytosis
http://www.youtube.com/watch?v=a4a
ZE5FQ284
PARAMECIUM
•Most protists reproduce
asexually by binary fission.
http://footage.shutterstock.com/clip-236788-stock-footage-a-microscopicsequence-showing-paramecium-dividing-by-binaryfission.html?language=de
•A few protists reproduce
sexually by conjugation,
exchanging genetic material
Words to know for quiz!
• Mitosis: Process of nuclear division by making new
body cells (4 stages) Prophase, metaphase,
anaphase and telophase.
• Interphase: period of cell cycle in which most time
is spent. G1, S and G2
• Daughter cells :cells that come from the parent
cells dividing to make new cells (MOTHER &
DAUGHTER.
• Cytokinesis: Division of cytoplasm and the end of
Mitosis.
Activity
One card stock show (fold 3 tabs like a
brochure) how each organism
(paramecium, amoeba, and euglena)
moves, eats, and reproduces.
Use pictures, words and labels!