protista Flashcards
what are chrysophytes
diatoms and desmids
how do diatoms float
due to light weight lipids
what are frustules
transparent siliceous shell of chrysophytes
what are the pigments present in diatoms and desmids
chlorophyll a
chlorophyll c
fucoxanthin
diatoxanthin
diadinoxanthin
beta-carotene
what is the reserve food material in chrysophytes
oil
leucosin (chrysolaminarin)
volutin granules
how much % of total organic matter is produced by chrysophytes
50
chrysophytes have resting spores called
statospores (centric diatoms)
examples of chrysophytes
triceratium
melosira
cymbella
navicula
what are the other names of dinoflagellates
pyrrophyta
golden brown algae
dynophyceae
armoured dinoflagellates
whirling whips
describe the flagella in dinoflagellates
heterokont
longitudinal one is narrow, smooth and directed posteriorly
transverse one is ribbon like and produces spinning movements
pigments in dinoflagellates
chl-a,c
alpha,beta carotene
xanthophyll (peridinin)
reserve food in dinoflagellates
carbs and oils
reproduction in dinoflagellates
mesokaryon (nuclear envelope and nucleolus are seen even during division)
mostly asexual
iso and anisogamy sexual rep are reported in ceratium
zygotic meiosis (gymodium, ceratium)
gametic meiosis (noctiluca)
bioluminescent dino
noctiluca
pyrodinium
pyrocystis
saxitoxin
gymnodium catenella causes shell fish poisoning in man
red tide
gonyaulax, gymnodium
describe flagella of euglena
heterokont
long tinsel like (stichonomatic)
the area of union of the flagella is the photosensitive paraflagellar body
explain motion in euglenoids
there are oblique but parallel strips in pellicle called myonemes
creeping motion is carried out by contraction and expansion of myonemes called metaboly
explain digestion in euglenoids
the apical end of the cell has an invagination with 3 parts
cytostome (mouth)
cytopharynx (gullet)
reservoir
explain photosensation in euglenoids
stigma/eye spot is attached to the membrane of the reservoir at the level of the paraflagellar body
it contains a pigment called astaxanthin with is red orange
nutrition in euglenoids
photoautotrophic (euglena viridis)
holozoic (paranema)
saprobic (rhabdomonas)
pigments in euglenoids
chl-a,b
xanthophyll
beta carotene
reserve food in euglenoids
paramylon
reproduction in euglenoids
fav- binary fission
unfav- palmella, cyst for perennation
what are the other names of slime moulds
myxomycetes
mycetozoa (debary)
gymnomycota
protistan fungi
stages where slime moulds resemble plants and animals
vegetative phase- animals
reproductive phase- plants
stages where slime moulds resemble plants and animals
vegetative phase- animals (no cell wall)
reproductive phase- plants (spores have cell wall)
examples of slime moulds
dictyostelium, polysphondilium
flagellated protozoan
trypanosoma gambiense (sleeping sickness)
