Presentation on theme: "Are all eukaryotic creatures, meaning their DNA is enclosed in a nucleus inside the cell (unlike bacteria, which are prokaryotic and have no nucleus to."— Presentation transcript:
Protozoan - name for this type of organism. The word protozoa means "little animal." Protozoa range in size from 1/5,000 to 1/50 of an inch 4 groups based on movement Sarcodinians Zooflagllates Ciliphorans Sporozoans
move by extending their cytoplasm some are surrounded by hard shells (ex. Forminiferans & radiolarians) Amoebas have no shells, pseudopod => extension of cytoplasm used to move and obtain food
Generally the smallest of the protozoa Use flagella to move. Have one or several long, whip-like projections called flagella poking out of their cells. E Example-trichonympha- live in termite gut
Generally the largest protozoa. Have hair-like projections called cilia Eat the other three types of protozoa Example Paramecium
All the members of the phylum are parasites. No structure for movement. The genus Plasmodium causes malaria, one of the greatest scourges of humans. Malaria has probably caused more human deaths than any other infectious disease; even today it is estimated to kill a million people a year in the sub-Saharan Africa. example Plasodium (causes malaria)
Unicellular algae Dinoflagellates Diatoms Euglenads M M M Multicellular Algae G Green Algae R R R Red Algae B B B Brown Algae
algae with 2 flagella, usually found in saltwater Pfiesteria produce toxic substances that stun passing fish and cause bleeding sores. The Pfiesteria then feed on the fish blood and fluids. (Red Tide)
Cell walls have silica, very abundant in Oceans. The shells of dead diatoms are mined to make a abrasives, s shiny road paint and grit in toothpaste.
Euglena is a typical member of the group (which numbers about 1600 species Most are unicellular.) Many swim by means of a single flagellum. They are not encased in a cell wall so they are flexible as well as motile.
Most diverse group of algae, with more than 7000 species growing in a variety of habitats. Like the plants, the green algae contain two forms of chlorophyll
Approximately 4000 species have been identified. Their closest relatives are the green algae and land plants. Some are used as food in coastal regions of Asia. Agar, the base for culturing bacteria and other microorganisms, is extracted from a red alga
The rockweeds and kelps. Some kelps grow as long as 30 m. All are multicellular although without much specialization of cell types. Most are found in salt water. Used for food in some coastal areas of the world and harvested in the U. S. for fertilizer and as a source of iodine
Slime molds have traits like both fungi and animals. Have very complex life cycles involving multiple forms and stages. Spores are produced, these spores are like plant seeds. Each of them becomes a new amoeba-like cell when they land and each goes off on its merry way.
The organisms in this group have a complex life cycle during the course of which they go through unicellular, multicellular, fungus-like (form spores) and protozoan-like (amoeboid) stages. With the exception of one species that causes powdery scab on potatoes, these organisms are of little economic importance.
As their name suggests, water molds were once considered to be fungi. But unlike fungi, the cell wall of water molds is made of cellulose, not chitin.
Some cause diseases Food for others (plankton) Some eat bacteria Help produce oxygen Breakdown dead plants and animals (decomposers)