green algae
Post on 23-Feb-2016
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Green Algae• Phylum ____________• Habitat: widespread in
marine and ______ water
• Notes:– Very diverse group, hard
to generalize about their ecology
– May be _________, filamentous or colonial, or multicellular
Filamentous Green Algae_________
has spiral-shaped __________
• Filamentous with spiral chloroplast in each cell
• Forms green “____” in ponds• Pyrenoids (sites of starch
storage) occur in the chloroplast• Asexual reproduction is by
__________ of the filament.
CHLOROPHYTA--SPIROGYRA
Spirogyra _________, a form of sexual reproduction
another filamentous Green Algae __________
__ Star-shaped chloroplasts per cells
a colonial Green Algae … _______________ colony with Daughter
colonies
Mother Colony
Daughter Colony
• SPHERICAL COLONY OF ____________ CELLS (colony is motile)
• Flagella on one side, ___ ___ ____ on other
• ASEXUAL REPRODUCTION:– A SURFACE CELL DROPS INSIDE
BALL AND BY _______ PRODUCES DAUGHTER COLONY.
– PARENT COLONY EVENTUALLY ______ TO RELEASE DAUGHTER COLONIES.
CHLOROPHYTA--Volvox
Colonial Green Algae, Volvox
Daughter cells remain attached to the parent cells COLONY
Male and female colonies form different germ cells. ______ cells are formed by division. The female germ cells do not divide. They enlarge to form an ova.
In some species the colonies are ____________.
http://www.plingfactory.de/Science/GruKlaOeko/Teichleben/Algen/Oedogonium%20sp..jpg
Oedogonium thallus
http://www.botit.botany.wisc.edu/images/130/Chlorophyta/Oedogonium_Images/Zoospore_MC.low.jpg
Oedogonium
Here the filaments are out of focus.The asexual __________ is in focus.
http://www.csupomona.edu/~jcclark/classes/bot125/resource/graphics/g/chl_oedogonium.jpg
http://www.biologie.uni-hamburg.de/b-online/fo44/18.jpg
OedogoniumThis is the zoospore, or maybe it is the sperm. Both have the same look!
When both oogonium and
__________ appear on the same filament the alga is
___________.
• ________ fresh-water algae
• some cells of the filament become oogonia (egg-producing structures)
• some cells become antheridia (____-producing structures)
• sexual and _____ reproduction
CHLOROPHYTA – Oedogonium
• Filamentous fresh-water alga
• ______ reproduction is by zoospore production
CHLOROPHYTA--Ulothrix
• Sexual reproduction involves flagellated ___________
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