ALGAE simple "aquatic plants"

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TAXONOMY

după Heya Khosa - Jean Augustine SS (2612)

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ALGAE simple "aquatic plants"

taxonomy

euglenophyta

pyrrophyta (dinoflagellates)

chrysophyta (diatoms)

phaephyta (brown)

rhodophyta (red)

chlorophyta (green)

classification based on

life history patterns

reproductive structures

morphology of cells

chlorophyll and pigments

flagella number and location

cell wall

distribution of algae

terrestrial

endosymbionts in protozoa, worms, corals, fungi (lichen)

moist rocks, trees, soil

primarily aquatic

a. planktonic- suspended in aqueous environment b. benthic- attached and living on the bottom of water c. neustonic- at water-atmosphere interface

motility of algae

a. single flagella- Euglena b. 2 or 4 polar flagella- Chlorophyta c. 2 flagella of different length and point of insertion- Dinoflagellates

due to flagella only during sexual reproduction

habitat

a. aquatic habitat like fresh water b. moist soils and artificial aquatic habitat c. few in dry soils d. acidic habitat

algal ecology

primary producers of the ocean

macroscopic form

secondary products

human food

seaweed

algal reproduction

sexual reproduction

asexual reproduction

binary fission

spores

fragmentation

classification of algae

Subtopic

cell walls of algae

sometime chitin or silica or no cell wall

strengthened with calcium carbonate

cellulose fibrils but usually modified by addition of polysaccharide

characteristics

a. lack of vascular conducting system b. simple reproductive structure, lack true leaves roots, flowers

photoautotrophic

eucaryotic+chlorophyll and pigments