THE GREEN ALGAE Flashcards
green algae
Supergroup
Clade
Division
(Supergroup Archaeplastida, Clade Chlorophyta, Division Chlorophyta
are considered most
advanced among algae and most closely related to land plants.
green algae
Asexual reproduction may be by
fission (splitting), fragmentation or by formation of zoospores (motile spores).
Sexual reproduction is very common and may be (3)
isogamous
anisogamous
oogamous
gametes both motile and same size
isogamous
both motile and different sizes - female bigger
anisogamous
female non-motile and egg-like; male motile
oogamous
some green algae may have an alternation of haploid and diploid phases.
true
haploid phases form gametangia
diploid phases form zoospores by reduction division
true
green algae can grow even in snow and produce blooms known as the
watermelon snow
8,000 species of green algae, of which only about 1000 species are in marine waters, the rest in freshwater habitats.
true
is a unicellular motile green alga that inhabit freshwater habitats.
Reproduction in this organism is done both sexually and asexually.
Chlamydomonas
Chlamydomonas has the following
major parts:
cellulosic cell wall, the central nucleus, one cup-shaped chloroplast, the eyespot, the pyrenoid
(starch body in the lower part of the chloroplast), contractile vacuole, mitochondria and two anterior flagella.
Chlamydomonas Asexual reproduction is through production of ________ that develop into gametes in response to adverse environmental conditions.
biflagellated zoospores
represents the peak of evolutionary development of the colonial motile type of green algae.
The coordinated movement of the
flagella of all cells allows the entire colony to behave like one individual organism, moving forward as it also spins in a vertical axis. The colony varies from spherical to ovoid. A gelatinous envelope holds all cells together.
Volvox
The number of cells in the colonies of various species of _______ ranges from 500 to 50,000.
Volvox
shows some specialization and division of labor among the cells.
Volvox
__________cells occur at the base or hind end of the colony while the forward or leading end has only _________cells.
Reproductive cells
vegetative cells
in the vegetative cells are
larger than those of the reproductive cells.
Eyespots