Big Idea: Microbes play a critical role in the natural world.
There are many types of protists, but organisms in this kingdom only have a few things in common:
A eukaryote is an organism that has cells that has a nucleus and membrane-bound organelles.
|They typically live in water-based environments.||Most protists are unicellular (made of only one cell) and can live in colonies.||But there are some protists are are multicellular (containing more than one cell).|
Are protists prokaryotes or eukaryotes?
What is a eukaryote?
What type of environment would you typically find protists living?
Are all protists unicellular? yes or no
Obtaining Food / Nutrition / Energy
Protists have a few different methods of obtaining nutrition (food):
Some contain chloroplasts
(green pigments) like plants, and are autotrophs. Autotrophs
can use photosynthesis to
make their own food, for example Algae.
Then there are others that are heterotrophs and obtain their
food by absorbing it from their surroundings, for example Paramecium.
But there are some that can do both autotrophic and heterotrophic methods of obtaining food, for example Euglena.
How do the heterotroph protists obtain their food?
How do the autotroph protists get their food?
What is an example of a protist that can do both autotrophic and heterotrophic methods of obtaining food?
What is an example of a protist that absorbs their food?
What is an example of a protist that makes their own food?
Protists are classified by how they obtain food. Protists are organized into three main groups:
Animal - like protists (heterotrophs)
Plant/Algal - like protists (autotrophs)
Fungal - like protists (heterotroph decomposers)
How are protists classified?
Animal - Like Protists - Protozoa
Animal - like protists are often called Protozoa. Scientists classify them by the way they move around.
Most are unicellular and
microscopic. You can see them using a compound light microscope.
They are heterotrophs because they
absorb their food using vacuoles for digestion.
These are typically found in freshwater, marine, and moist land habitats.
What are the animal-like protists often called?
How do they obtain their food / energy?
How are they classified?
Methods of Protozoa movement:
|Cilia||small hair-like projections all around the organism|
|Flagella||long, thin, whip-like structure|
|Pseudopodia||"false feet" - temporary extensions of a cell's cytoplasm that help them move around and change their shapes to absorb their food|
|Parasites||move along with the host they invaded|
What is the method of movement that uses a long, whip-like tail?
What is the method of movement that uses "false feet"?
What are cilia?
Types of Protozoa:
|Phylum Sarcodina||Phylum Ciliophora||Phylum Zoomastingina||Phylum Sporozoa|
|Common Name - Sarcodines||Common Name - Ciliates||Common Name - Zooflagellates||Common Name - Sporozoan|
|Move by using Pseudopodia||Move by using Cilia||Move by using Flagella||Adults do not move|
(causes African Sleeping Sickness)
What is an example of a protozoa that uses a flagella for movement?
What type of protist phylum uses cilia?
Plant/Algal - Like Protists
Plant/Algal-like protists are eukaryotes that are similar to plants. Scientists classify these protists by the color of their pigments.
They are autotrophic and use chlorophyll and other pigments
to harvest and use energy from sunlight. They produce oxygen for our
They are not considered plants because they do not have true roots, stems or leaves and most have flagella for movement at some time in their life cycles.
Giant kelp belongs to a diverse group of organisms called algae. Simpler than most land plants, algae have no roots, stems, leaves or flowers. They range in size from microscopic cells to 100-foot-tall giant kelp.
|Green Algae||Brown Algae||Red Algae||Diatoms||Dinoflagellates||Golden Algae||Euglena|
What are plant/algal-like protists similar to?
How are they classified?
How do they obtain food/energy? autotroph or heterotroph?
What do they do for the environment?
Why are they not plants?
What type of plant/algal-like protist can grow up to 100 feet?
Fungal - Like Protists
Fungal-like protists are multi-cellular eukaryotes that are absorptive heterotrophs which means they must absorb their food for nutrients, unlike animals like us in which we eat (ingest) our food.
The job of fungal-like protists are
decomposers breaking down dead organic matter.
They improve the quality of dirt by putting nutrients back into the ground.
They are most commonly known as the slime molds or water molds. Do not confuse these with the mold you see growing on food or bread.
Are fungal-like protists unicellular OR multi-cellular?
How do they obtain their food? And what is this called?
What is the job of the fungal-like protists?
Give an example of a fungal-like protist.
Protists - Review - answer on handout
Copyright 2011 - Gina Isabelli - Central High School - Champaign, IL - Sophomore Biology