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
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 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]