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Amanuel Molla

on 19 March 2014

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Transcript of Protists

I can photosynthesise.
I am an organism that is karyotic and I have a nucleus.
I am unicellular
I have cell walls and vacuoles.
The protists kingdom is extremely diverse containing unclassifiable organisms
Known as the "dumping ground" kingdom; includes all the eukaryotes that are not fungi, plants, or animals
Most protists are aquatic and unicellular
Essential producers and consumers in many ecosystems
Why Protists are Important
The origins of eukaryotes
Classification and phylogeny
Interactions in ecosystems
Life cycle
What am i?
Play key roles in aquatic ecosystems
perform photosynthesis along with prokaryotic, also major producers in the worlds oceans.
non- photosynthetic protists are important consumers especially at a microscopic level, where they dominate the lowest levels of most aquatic food pyramids
they are parasites- live in or on other organsims
valuable to humans! If you like sushi, you have eaten nori, the seaweed used to wrap sushi rolls!
Most diverse kingdom of eukaryotes
200,000 known
traditionally taxonomic group
The Protist kingdom is NOT a evolutionary kinship unlike animals, plants, fungi, eubacteria and archea kingdoms
Protists are considered the garbage bin for all other species that fail to fall into the major categories of kingdoms
The phylogenetic tree of Domain Eukaryotes classifies protists
Animals, Plants and fungi are the only ones on it that are not protists on the tree
Protists play key roles in ecosystems as producers or consumers!

For example, seaweeds have gas-filled bladders that help them float towards light, allowing them to produce energy through a process known as photosynthesis. Photosynthetic protists are the primary producers that serve as the base of aquatic food webs and provide for all aquatic life.
Climate change such as the rising temperature and acidity in oceans interfere with some protists ability to produce their protective outer shell resulting in their loss which could lead to severe damaging of marine food webs.
Coral shells are home to millions of species
Some protists live as
organisms within the bodies of other animals. This means that these animals are dependent on photosynthetic protists for food. A good example are corals; since corals rely on these protists for food, climate change would directly affect them. As temperatures and levels of acidity rise, the protists found within corals cannot preform photosynthesis and will die if conditions continue.
Phytoplankton are microscopic algae that live in marine environments. Phytoplankton are key to marine ecosystems and produce about half the world's oxygen. However, their population is thought to be declining by 1% each year.
The only thing protists all share is that they are not animals, plants or fungi
Protists are everything else
Many are unicellular or muticellular
All protists are eukaryotic, in other words they contain membrane bound organelles such as mitochondria
Protists are all different from one another, from the way that they move,reproduce and obtain nutrients
A lot of protists are extremely complex
Some examples of representative protists include; diatoms, red algee, slime moulds, euglenoids.
an example of a protist
most are muticellular
have no cilia or flagella
cell walls are made of cellulose
Single-celled protists reproduce sexually and asexually
Multi-cellular protists have more complex life cycles.
Asexual reproduction involves binary fission. When a paramecium undergoes binary fission, the macronucleus is stretched out and then divides.
Sexual reproduction involves conjugation. In a paramecium, conjugation involves the exchange of special micronuclei.
Multi-cellular protists have more complex life cycles and involve formation of sex cells. The process includes haploid sex cells that make a diploid zygote.
Protists were the first eukaryotes
A eukaryote is an organism in which the cells contain a nucleus and other membrane bound structures.
The membrane bound structure was likely developed from folded cell, membrane of an ancestral prokaryote cell.
A prokaryotic cell is an organism that does not contain membrane bound organelles.
The folding of the prokaryotic cell would have increased the cell surface area, allowing the cell to better exchange materials with its environment.
The mitochondria and chloroplast were said to have originated by Endosymbiosis. Endosymbiosis occurs when one type of bacterium is engulfed within a cell in which two cells live within one.
Brown algae
Green algae (protists) not plant!
energy source= autoprophs,photosynthetic
2 flagella for moving
outer layer=stiff
Full transcript