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14 Cards in this Set
- Front
- Back
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Dinoflagellates (phylum pyrrophyta) |
Unicellular flagellated protists Marine environment Biflagellate - dinoflagellate - one long (distal and free) and other flat and ribbon like — called whirling whips
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Dinoflagellates - nutrition |
photosynthetic, heterotrophic and mixotrophic Contains chlorophylls a and c |
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Dinoflagellate symbionts |
Lack armored plates and appear as golden spherical cells called zooxanthellae |
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Dinoflagellates - Reproduction |
Primarily asexual by longitudinal cell division |
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Diatoms (phylum Chrysophyta) |
Chief producers (autotrophs) in oceans Both marine and freshwater Unique glass like wall made of hydrated silica ( silicon dioxide) embedded in an organic matrix Cell wall known as frustule divided into two halves (theca) - epitheca and hypotheca Two main groups of diatoms - radial symmetry (centric diatoms) anf bilateral symmetry (pennate diatoms) |
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Diatoms - nutrition |
Chlorophyll a and c and cartenoids, fucoxanthin Diatoms energy reserves - lipids and water soluble polysaccharides chrysolaminarin in vacuoles |
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Diatoms - Reproduction |
Primarily asexual by binary fission |
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Euglenoids (phylum Euglenophyta) |
Unicellular flagellated protists Freshwater Devoid of cell wall Protein rich layer under plasma membrane called pellicle (periplast) - flexible body Biflagellate - one short and other long |
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Euglenoids - Nutrition |
Two third - colour less heterotrophs One third - contain chloroplasts Chlorophylls a and b Do not store starch in chloroplasts Carbohydrate is stored as glucose polymer m, paramylon in cytosol |
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Slime Mold |
Heterotrophic protists Two main groups - plasmodial slime molds (phylum Myxomycota) and cellular slime molds (phylum Dictyosteliomycota) |
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Plasmodial Slime molds |
A large non cell walled, multinucleated single cell structure called plasmodium In unfavourable conditions plasmodium develops fruiting bodies (or sporangia) — non flagellated myamoebas or haploid flagellated swarm cells |
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Cellular slime molds |
When nutrients are abundant - exist as solitary free living amoeba like cells When nutrition inadequate - aggregate and move in a single body called pseudoplasmodium or slug |
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Dictyostelium dicoideum |
Cellular slime mold - model organism for studying the evolution of multicellularity |
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Oomycetes or oomycota (egg fungus) |
Include the water molds, the white rusts and the downy mildews Traditionally placed in kingdon fungi Unlike true fungi - do not have cell walls of chitin They no longer have plastids and do not perform photosynthesis Best studied oomycete - phytophthora infestans, causing late blight of potato |
