作者:adibah kassim 11 年以前
1473
ALGAE simple "aquatic plants"
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