Transcript Plantlike Protist: Unicellular Algae

Plantlike Protist: Unicellular
Algae
Ms. Sheldon
Microbiology
OVERVIEW
• Green Pigment called Chlorophyll for
photosynthesis
• Motile
• ALGAE
• Debate about if they should be in the plant
kingdom
CHLOROPHYLL and
ACCESSORY PIGMENTS
• Light is trapped by Chlorophyll and accessory
pigments
• Chlorophyll a – the most effective
• Chlorophyll b and c absorb other wavelengths of
light
• Accessory Pigments – capture light at other
wavelengths than chlorophyll
EUGLENOPHYTA
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1,000 species
Unicellular flagellated euglenoids
Can be heterotrophic absorbing decaying matter
Chlorophyll and photosynthetic – plant like
No cell wall and two flagella and pellicle (cell
membrane that is folded like a ribbon
• Freshwater, crawl through mud
• Asexual reproduction with binary fission
• Eyespot – reddish pigments to find sunlight
CHRYSOPHYTA
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850 species
Golden algae (yellow-green)
Freshwater
Cysts are formed to survive unfavorable
conditions
• Two flagella, pectin in cell walls and sometimes
cellulose as well
• Shade of yellow of brown carotenoids
• Store energy as oil and help in petroleum
formations
DIATOMS BACILLARIOPHYTA
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11,500 species
Freshwater and Marine
Shells or Valve made of silicon dioxide
Centric diatoms – circular shells
Pennate diatoms – rectangular shells
Phytoplankton – release oxygen
Diatomaceous earth - shells and is used in
detergents, paint remover, fertilizers, insulators
and some toothpaste
PYRROPHYTA DINOFLAGELLATES
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1,100 species
Unicellular
½ Photosynthetic and 1/2 heterotrophic
Yellowish green to brown color
Two flagella
Made of cellulose
Bioluminescence – light – Fire Plant
Color producing toxins – red tide
This is what makes them dangerous to humans, oysters and
such eat them and then we eat them
ECOLOGY
• Base of the food chain
• Phytoplankton = surface of ocean living
organisms, food source
• Algal Blooms = sewage is a great food
source, grow in population and deplete the
nutrients, can be toxin producing (red tide)