Protists
Diatoms live in fresh and salt water and are an important food source for many marine organisms
What is a Protist
Protists are Eukaryotes that cannot be classified as animals, plants, or fungi. Because protists are so different from each other you can think of them as the "odds" and "ends" kingdom
Live moist surroundings
Diversity
Animal-Like Protists
All animals are heterotrophs that must obtain food by eating other organisms
Like animals, animal-like protists are heterotrophs, and most are able to move from place to place to obtain food
Protozones are unicellular, and they can be classified into four groups, based on the way they move or live
Protozoans With Pseudopods
Prorozoans With Cilia
Sarcodines move and feed by forming pseudopods temorary bulges of the cell Sarcodines are a type of protozone
Pseudopod means "false foot"
Amoebas have a contractile vacuole, a structure that collects the extra water and then expels it from the cell
Protozoans With Flagella
Protozoans That are Parasites
Ciliates have structures called cilia, which are hairlike projections from cells that move with a wavelike motion.
Ciliates use their Cilia to move and obtain food
2 nucleus's
Plantlike Protists
Funguslike Protists
The third group of protozoans are flagellates, protists that use long, whiplike, flagella to move. A flagellate may have one or more flagella.
The interaction between these two species is an example of symbiosis a close relationship in which at least one of he species benefits
When both partners benefit from living together, the relationship is a type of symbiosis mutualism
The fourth type are all parasites that feed on cells and bodily fluids of their host. These protozoans move in a variety of ways. Some have flagella, and some depend on their hosts for transport
Many of these Parasites have more than one host.
Diatoms
Dinoflagellates
Euglenoids
Red Algae
Green Algae
Brown Algae
Slime Molds
Water Molds and Downy Mildews
Plantlike protists, which are commonly called algae are extremely diverse. Like Plants, algae are autographs.
Algae consists of pigments- chemicals that produce colors.
They are unicellular protists with pretty glasslike cell walls
Some float near the suface of lakes or oceans and others attach to objects such as rocks in shallow water
Over time they form layers of a coarse substance called diatomaceous
They are unicellular algae surrounded by stiff plates that look like a suit of armor
Because they have different amounts of green, orange, and other pigments, they exist in a variety of colors
Green, unicellular algae that are found mostly in fresh water
Unlike other algae, they have one animal like characteristic-they can be heterotrophs under a certain condition
Almost all red algae are multi cellular seaweeds
Divers have found Red Algae growing more than 260 meters below the oceans surface
People use red algae in a variety of ways. Carrageenan and agar, substances extracted from red algae, are used in products such as icecream.
Most green algae are unicellular but some form colonies, and a few are multicellular
Most of the algae lives in salty or fresh water
Green algae and plants contain the same type of green pigment and share other important similarities
Many of the organisms that are called seaweed are brown algae
Many brown algae also have gas filled sacs called bladders that allow algae to float upright in the water
Brown algae also contain yellow, green, and orange pigments .
A spore i a tiny cell that is able to grow into a new organism. Like fungi, funguslike protists are heterotrophs, have cell walls, and use spores to reproduce
Slime molds live in forests and moist, shady places
They ooze along the surfaces of decaying materials, feeding on bacteria and other microorganisms
Most water molds and downy mildews live in water or moist places
These organisms often grow as tiny threads that look like fuzz.