Lab 15 - Algay Flashcards
General characteristics of algae
freshwater/marine/terrestrial environments
symbioses with other organisms
unicellular to multicellular
many have chlorophyll and pigments
What phylum is considered to be the link between algae and land plants? Why?
Charophyta - retention of the zygote after fertilization
What kind of phylogenetic group are algae?
Polyphyletic
Thallus
plant-like body of vegetative tissue with no tissue differentiation
Chlorophyll
several green pigments found in cyanobacteria, algae, and plants that allows for absorption of energy from light
Accessory pigment
additional pigments that allow absorption of energy from different wavelengths to that of chlorophyll
Monoecious
single house - individuals produce both egg and sperm
Dioecious
two houses - individuals of a species produce either eggs or sperm
What pigments absorb green light?
chlorophyll a, b, c, and d
What colors do carotenoids absorb?
yellow, orange, red
what colors do phycobilins absorb?
blue, red, orange, purple
What group are red algae and green algae in?
archaeplastida
What algae are in the group SAR?
brown algae, diatoms, dinoflagellates
Phylum Chlorophyta
spirogyra life cycle
sexual reproduction via conjugation
conjugating filaments come together and form a conjugation tube
gametes unite to form a zygote in one cell
pigments: chlorophylls a and b
reproduction: sexual
use starch for energy storage
SAR - Brown Algae
large relative to other algae (kelp)
many have stalks (stipes) or flattened bodies (blades)
use a holdfast to attach to substrate
use bladders to float
