Green Algae (1)

Green Algae Morphology 1. Phylum? Origin? Species? Size? Habitat?

Phylum Chlorophyta

Water-Land

6000 species of green algae

Unicellular, Colonies or Long-filaments

-Long filaments thread-like (Cyanobacteria)

Aquatic: Freshwater, marine or moist terrestrial

Algae Morphology 2. Membrane bound organelles?

MOST have chloroplast and nuclei (Chlorophyll A + B) give them their green color)

SOME have flagella

ALL have cell walls that contain cellulose

-(C6H10O5)n main component of plant cell walls

ALL have mitochondria with flat cristae

-Flattened inner folds of mitochondrial membrane

How do green algae reproduce?

1.) Asexually

-Fission (1 cell splits into 2 identical daughter cells)

-Zoospores (Spore Formation) spores are motile)

-Fragmentation

2.) Sexually

-Alternation of generations (2 different life stages)

a) Haploid Gametophyte

b)Diploid Sporophyte

c) Male and female gametes are similar (Isogamy)

d) Ulva is isogamous (Look the same, chemically different)

Genus Ulva Morphology. Common name? Size? Habitat? Reproduction? Special?

Sea lettuce

Multicellular

Flat blade like “leaves” called thallus

Lives in marine and brackish water

-Brackish water: saltwater + freshwater

Alteration of generations

-Gametes motile, zygote formed in water

Lichens

Symbiotic relationship with fungi

Fungi + Cyanobacteria or green algae

Fungi gives structure

Algae gives food

Genus Chlaymydomous Common name? Size? Organelles? Habitat? Special? Classification?

Unicellular

2 Flagella

Stagnant water, damp soil, fresh + salt water, snow

2 Nucleus inside chloroplast

2 Small vacuoles remove waste

Red pigment spot (eyes) detect light

Genus Volvox Organelles? Size?

Flagellum

Colonial

Outside are Gonodiums, (reproductive cells)

How does alternation of generations work (Green Algae)

Gametophyte produce gametes

Gametes fuse into diploid zygote

Zygote grow into sporophyte

Diploid sporophyte produce spores (meiosis)

Spores grow into haploid gametophyte (mitosis)

Genus Ulva morphologically similar

Ecological and Economic Roles

Logical:

Oxygen Producers

Base of aquatic food chains

Absorb and recycle nutrients from water

Nomical:

Eaten as food

Biology research

Natural fertilizer

General Overview of Green Algae

Photosynthesis

Aquatic

Unicellular/Very small