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Plant-Like & Fungus-Like Protists
Unit 6 – Lecture 3
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Algae – an Introduction
Alga – plant like protist – plural, algae unicellular or multicellular major producer of world’s oxygen sexual or asexual reproduction or both alternation of generations autotrophic – photosynthetic
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Algae – An introduction
Six Phyla of Algae Euglenophyta Bacilliarophyta Dinoflagellata Chlorophyta Rhodophyta Phaeophyta
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Discuss All of these end in “phyta”
phyte, phyto or phyta refer to being ____________ like or being a ______________.
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Euglenophyta the Euglenoids
plant-like photo- synthesis, but animal-like movement w/ flagellum unicellular autotroph and heterotroph asexual reproduction pellicle & red eye-spot (eyespot)
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Bacillarophyta Diatoms unicellular autotrophic – photosynthetic
chlorophyll & carotenoids asexual or sexual reproduction silica shells, diverse shapes food storage as OIL not starch
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Dinoflagellata Dinoflagellates have 2 (“di”) flagella unicellular
autotrophic – photosynthetic chlorophyll & carotenoids
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Dinoflagellata asexual reproduction [or weird fusion…]
thick cellulose plates bioluminescence can be harmful
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Dinoflagellata red tide
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Discuss Which phylum of algae… have shells made of glass?
are responsible for the harmful red tides? are both auto- and hetero- trophic? Which type(s) of algae are phytoplankton, and what great benefit do phytoplankton serve?
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Chlorophyta Green Algae – most diverse
unicellular, multicellular, or colonial most in water but all need moist place to survive…
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…a moist place like a SLOTH! [only 2 – 4 meters per minute ]
Chlorophyta …a moist place like a SLOTH! [only 2 – 4 meters per minute ]
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Chlorophyta can have flagella alternation of generations
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Alternation of Generations
type of reproduction utilizing asexual & sexual means
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Alternation of Generations
offspring generations alternate between being haploid [1n] in one generation to being diploid [2n] the next.
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Alternation of Generations
Sporophyte [2n] produces spores [1n] through meiosis
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Alternation of Generations
Spores [1n] produce gametophytes [1n] through mitosis
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Alternation of Generations
Gametophyte [1n] produces gametes [1n] through mitosis
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Alternation of Generations
Gametes [1n] fuse in fertilization to produce zygote [2n]
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Alternation of Generations
Zygote [2n] grows to become embryo [2n]
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Alternation of Generations
Embryo [2n] grows to become sporophyte [2n]… etc.
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Discuss – What You Need to Know About Alternation of Generations
type of reproduction utilizing _______________ & _______________ means offspring generations alternate between being _______________ [1n] in one generation to being _______________ [2n] the next. gametophytes [1n] make _______________ [1n] through mitosis sporophytes [2n] make _______________ [1n] through meiosis
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Other Phyla Rhodophyta – sea weeds, red algae
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Other Phyla Phaeophyta – brown algae, kelp most in salt water
have air bladders to keep them afloat
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What is the most diverse group of plant-like protists?
Discuss What is the most diverse group of plant-like protists?
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Fungus-Like Protists Slime Molds, Water Molds, & Downy Mildews
unicellular to colonial heterotrophic – saphrophytic have cell walls live in moist places all have movement at some point in their life cycle to get to food
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Fungus-Like Protists “mycota” / “mycete” – fungus or fungus-like
examples myxomycota – plasmodial slime molds form a plasmodium no cell wall no membranes
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Fungus-Like Protists “mycota” / “mycete” – fungus or fungus-like
examples myxomycota – plasmodial slime molds form a plasmodium many nuclei – cells merge together into a large mass amoeboid movement reproduce with spores
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Fungus-Like Protists “mycota” / “mycete” – fungus or fungus-like
examples acrasiomycota – cellular slime molds come together to reproduce only when food is scarce – otherwise, independent has cell membrane haploid during entire life cycle
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Fungus-Like Protists “mycota” / “mycete” – fungus or fungus-like
examples oomycota – water molds & downy mildews produce flagellated reproductive cells very large and diverse group
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Discuss What word refers to… the color red? the color green?
the color brown? plant or plant-like? fungus or fungus-like?
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Homework complete the Euglena Reading & Coloring w/s
[and finish the webquest if you haven’t done so… it’s due tomorrow]
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