Presentation on theme: "Unit 6 – Lecture 3. Algae – an Introduction Alga – plant like protist – plural, algae unicellular or multicellular major producer of worlds oxygen sexual."— Presentation transcript:
Unit 6 – Lecture 3
Algae – an Introduction Alga – plant like protist – plural, algae unicellular or multicellular major producer of worlds oxygen sexual or asexual reproduction or both alternation of generations autotrophic – photosynthetic
Algae – An introduction Six Phyla of Algae Euglenophyta Bacilliarophyta Dinoflagellata Chlorophyta Rhodophyta Phaeophyta
Discuss All of these end in phyta phyte, phyto or phyta refer to being ____________ like or being a ______________.
Euglenophyta the Euglenoids plant-like photo- synthesis, but animal-like movement w/ flagellum unicellular autotroph and heterotroph asexual reproduction pellicle & red eye-spot (eyespot)
Bacillarophyta Diatoms unicellular autotrophic – photosynthetic chlorophyll & carotenoids asexual or sexual reproduction silica shells, diverse shapes food storage as OIL not starch
Dinoflagellata asexual reproduction [or weird fusion…] thick cellulose plates bioluminescence can be harmful
Dinoflagellata red tide
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?
Chlorophyta Green Algae – most diverse unicellular, multicellular, or colonial most in water but all need moist place to survive…
Chlorophyta …a moist place like a SLOTH! [only 2 – 4 meters per minute ]
Chlorophyta can have flagella alternation of generations
Alternation of Generations type of reproduction utilizing asexual & sexual means
Alternation of Generations offspring generations alternate between being haploid [1n] in one generation to being diploid [2n] the next.
Alternation of Generations Sporophyte [2n] produces spores [1n] through meiosis
Alternation of Generations Spores [1n] produce gametophytes [1n] through mitosis
Alternation of Generations Gametophyte [1n] produces gametes [1n] through mitosis
Alternation of Generations Gametes [1n] fuse in fertilization to produce zygote [2n]
Alternation of Generations Zygote [2n] grows to become embryo [2n]
Alternation of Generations Embryo [2n] grows to become sporophyte [2n]… etc.
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
Other Phyla Rhodophyta – sea weeds, red algae
Other Phyla Phaeophyta – brown algae, kelp most in salt water have air bladders to keep them afloat
Discuss What is the most diverse group of plant-like protists?
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
Fungus-Like Protists mycota / mycete – fungus or fungus-like examples myxomycota – plasmodial slime molds form a plasmodium no cell wall no membranes
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
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
Fungus-Like Protists mycota / mycete – fungus or fungus-like examples oomycota – water molds & downy mildews produce flagellated reproductive cells very large and diverse group
Discuss What word refers to… the color red? the color green? the color brown? plant or plant-like? fungus or fungus-like?
Homework complete the Euglena Reading & Coloring w/s [and finish the webquest if you havent done so… its due tomorrow]