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botany
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Trachelomonas – non-motile form
Cyst stage- thick dormant stage when conditions become unfavorable or adverse
Economic importance:
Producers of aquatic environment
Food for aquatic animals Increase oxygen
concentration Indicators of water
pollution
Vaucheria
Phylum Chrysophyta – yellow green algae
Coenocytic, monoecious, homothallic
Oogonium -female
Antheridium- male
Synura- equally biflagellated
Ochromonas- unequally biflagellated
Chrysamoeba radians - uniflagellated
Centric diatom – marine and radially symmetrical
Pennate – fresh water species,
motile, bilateral symmetry
Economic importance
Diatomaceous earth –
piles of dead silicious walls of diatoms
Soundproofing materials Metal polish Petroleum products Toothpaste
Economic importance
Red tide – algal bloomColor the water reddish
brownProduces a toxin –
satitoxinPSP – paralytic shellfish
poisoning
Phylum Chlorophyta – green algae
With chl a and b Starch Cellulosic cell wall Starch – reserved food
Caulerpa taxipholia, Caulerpa racemosa –
commonly called ar-arosep. Edible green algae, rich in iodine and minerals
Reproductive organ of Chara
Oogonium and antheridium
-multicellular
-Protected with sterile jacket cells
Phylum Phaeophyta – Brown algae
Multicellular Marine Fucoxanthin – brown pigment Mannitol – reserved food Alginic acid- for commercial
purposes
Alternation of Generation
Two phases of life cycle
Gametophyte – haploid sexual phase produces gametes
Sporophyte – diploid asexual phase produces spores
Three classes
Class Isogenerate= G(n) and S(2n) are morphologically the same
Class Heterogenerate= G(n) and S(2n) are morphologically different.
Class Cyclosporae= no alternation of generation
Padina Dictyota Colpomenia
Economic importance1. source of alginic acid2. source of sulfated polysaccharides such as
fucoidan and fucans
Phylum Rhodophyta – Red algae
Marine Phycoerythrin and phycocyanin Floridean starch/floridosides Triphasic life cycle