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on 7 September 2013

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Transcript of Protists

By: Benjamin Jenkins
Characteristics of Protists
More Characteristics of Protists
All are eukaryotic
Most have cilia or flagella at some point in their life cycle
Some have cell walls
Live in presence of water
Pediastrum Boryanum
Kingdom: Protista
Phylum: Chlorophyta
Class Clorophyceae
Family: Hydrodictyaceae
Genus: Pediastrum
Species: Pediastrum boryanum
Common Name: Green Algae

Most protists reproduce asexually, but scientists have discovered that some reproduce sexually through meiosis, especially if the organism is under stress, such as in conditions of starvation or heat shock.
How Do They Get Their Energy?
Some protists are autotrophs and create their own food using energy from either light or chemical breakdowns. Others are heterotrophic and must consume food by either consuming it or absorbing it.
How Many Cells?
Cell Walls?
- When it is seen in water, it is nearly always mixed with other types of algae
- Green algae is capable of surviving in boiling water
Protists live in the presence of water. Many are completely aquatic and live in bodies of fresh water or oceans. Others live in moist environments such as soil or even the human body.
Protists move in several ways. Some have cilia, or tiny hair-like structures. Others have flagella, which move like a whip to propel the organism. They move either of these to "row" through water. Still others have pseudopods, or projections that they use to push themselves along.
The word "protista" was first used in 1866 by Ernst Haeckel.
There are between 60,000 and 200,000 types of protists.
Many protists cause illness and disease in plants and animals
Extracts from red algae, a type of protist, is used to make paint.
Cell Type
All protists are eukaryotic, which means that their cells have a nucleus and other organelles within a membrane.
The word "protista" was first used in 1866 by Ernst Haeckel
There are between 60,000 and 200,000 types of protists.
Protists can cause serious illness and disease in both animals and plants.
Extracts from red algae, a type of protist, is used to make paint.
Most protists are unicellular, having only one cell. However, others are multicellular. Some even live in colonies. Some are free-living and not dependent on other organisms for survival. Others are parasitic.
Most reproduce axsexually, although some reproduce sexually
Some are autotrophic, others are heterotrophic
Some are unicellular, others are multicellular
Facts About Protists
Slimes, molds, and algae are all types of protists.
Examples of Protists
- When in water, it looks like green slime
- Under a microscope, it looks like a spiky ball with many little sections
- It is usually seen in large numbers and mixed with many other types of algae
General Characteristics
- Green algae can be commonly found in:
All protists have a cell membrane. Amoebas do not have a cell wall. Algae and slime molds have strong cell walls that usually are made of cellulose. Other protists can have a shell-like covereing of silica or calcium.
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