19.3 Algae summary
Green Algae
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Phylum Chlorophyta
Can be unicellular, multicellular or colonial
Have cell walls and store food as carbohydrates
Photosynthetic
Diversity of Algae
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Algae can be single or multicellular
Algae are classified using three criteria
Some unicellular algea are called phytoplankton
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method of food storage
cell wall composition
pigment type
Characteristics
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Algae differ from plants because they don't have roots or leaves and other typical plant structures
Algae have chlorophyll as their main photosynthetic pigment
Algae are plant like protist
Diatoms
Reproduction
Phylum Bacillariophyta
Reproduce sexually and asexually
Cell walls are composed of silica
Store food as oil
Photosynthetic autotrophs that use chlorophyll and carotenoids as pigments
Dinoflagellates
They are unicellular
Two flagella at right angles to one another, causing the dinoflagellate to spin as it moves.
Cell walls made of cellulose
Some are autotrophic, some are heterotrophic
Euglenoids
Phylum Euglenophyta
Contain characteristics of both plants and animals
Unicellular plantlike protists
Chrysophytes
Have carotenoids as a photosynthetic pigment
Are yellow-green or golden-brown algae
Most chrysophytes are unicellular, but some are colonial
Brown Algae
Phylum Phaeophyta
Color comes from secondary pigment called fucoxanthin
Cell wall composed of cellulose
Multicellular
Done by:
Sara Al Blehed
Nujud Al Jasser