Chapter 18- kingdom Protista-algae

features of kingdom protista

all eukaroytic cells

unicellular

3 phylum

Chlorophyta (green algae)

chromophyta (brown algae)

phylum Rhodophyta (red alage)

phylum Chlorophyta

• differnt cellular organization:unicellular, multicellular colonial

• live in freshwater, lakes, ponds and streams

• store food as starch

• reproduce sexually and asexually

phylum Chlorophyta- chlamydomonas 

• unicellular

• contractile vacuoles:regulate water intake and remove waste

• chloroplasts w/ 1 or 2 pyrenids inside

• pyrenoids: concentrate CO2 around riunisco involvedin starch synthesis and storage

• redspot near base of flagella: allows

• alga to swim towards light

• asexual reproduction through zoospores

• sexual reproduction through gametes—> fuse together through meosis

• gametes with same size and shape:isogamy

• motile gametes

• fertelization in water

phylum Chlorophyta- ulothrix

multicellular, filaments

chloroplasts w/ pyrenids

asexual reproduction by zoospores

sexual- isogamy,, fertezlation in water motile gametes

phylum Chlorophyta- spirogyra (watersilk)

• spiral inside filaments

• multicellular (colonial), filaments

• chloroplasts ribboned shaped & spirally wrapped

• asexual reproduction by fragmentation of filament

• sexual reproduction- by conjugtion,, isomagy w/ motile male gamete fertelization inside cell

phylum Chlorophyta- oedogonium

• multicellular, filamentous 

• has holdfast anchors it to rocks and substrates

• has oogonium: swollen cell 

• containing single egg

• has artheridium: cell that produces 2 motile sperm

• asexual zoospores

phylum Chlorophyta- hydrodictyon (water nets)

• colonial, form net like structures

• volox- colonial with cells held together in secretion with gelationous material

• Ulva- multicellar seaweed

phylum Chromophyta (brown algae) -ditatoms

food not stored as starch