Biol 227 Algae Exam Questions with Complete Solutions 100% Verified| Latest
Update Graded A+
sexual lifecycles for phyoeophyceae • AOG- sporic meiosis - isomorphic and heteromorphic
• Diplontic- gametic meiosis
Unilocs site of meiosis and produce spores
Plurilocs site of meiosis and produce spores and gametes
Pheromones compounds released into he environment to attract the opposite sex.
Produced by the female to attract the make gametes.
Chemotaxis move along a chemical gradient.
Ectocarpales • Were considered primitive
• Mostly filamentous
• Isomorphic AOG
• Isogamous
Sphacelariales • Isomorphic AOG
• Iso, aniso and oogamous gametes
• Predominant apical cells
• Multiseriate filament
• Vegetative propagules
• Phaeophycease haius
,Dictotales • Fan shaped parenchymous thalli
• Predominant apical cell
• Isomorphic AOG
• Reproductive structures in sori
Laminariales • Large parenchymous thalli
• Heteromorphic AOG; microthalli (1N) and macrothalli (2N)
• Intercalating meristem adds to length
• Meristoderm can split
• Tissue differentiation
• Gametophytes are filamentous
• Gametes are oogamous
• Blade splitting is important
• Sori on vegetative blades or special blades
Undaria • Invasive in many parts of the world
• Cultivated in some parts of the world
• Lots of effort made to keep it out
• Genetic markers show multiple introductions
Focales • Apical growth
• Diplontic life cycle oogamous
• Diploid plant produces gametes
Durvilleae Antartical • Focales
, • Honeycomb strnds for buoyancy
• Used to be used as bags by the maori
• Can be eaten or collected for alginate
Antarctic circumpolar current (ACC) a unidirectional current. Durvilleae travels on this
current and homogenises the variation. Sargassum is in the Sargasso sea and is also
pneumatised. It is currently undergoing a massive algal bloom due to deforestation and land
run off.
Diatoms • Photosynthetic unicells
• Have chl a and c2, and fucoxanthin
• Laminarin
• Some sperm have flagella
• Compound silica cell wall and frustule
• Large central vacuole
• Diploid- gametic meiosis
• Taxonomically, phylogenically, and ecologically diverse
• Good fossil record
Diatom silica frustules made out of two components- epitheca and hypotheca on either side
of the plasma membrane. Both of these structures have girdle bands which are glass bands that
enable growth in length.
Parmales, Bolidophyceae a sister group and shows the previously unknown development of
frustules and scales. These show the missing step in the evolutionary record of diatom
development of scales with epivalves.
Diatom types centrics or pennates
Update Graded A+
sexual lifecycles for phyoeophyceae • AOG- sporic meiosis - isomorphic and heteromorphic
• Diplontic- gametic meiosis
Unilocs site of meiosis and produce spores
Plurilocs site of meiosis and produce spores and gametes
Pheromones compounds released into he environment to attract the opposite sex.
Produced by the female to attract the make gametes.
Chemotaxis move along a chemical gradient.
Ectocarpales • Were considered primitive
• Mostly filamentous
• Isomorphic AOG
• Isogamous
Sphacelariales • Isomorphic AOG
• Iso, aniso and oogamous gametes
• Predominant apical cells
• Multiseriate filament
• Vegetative propagules
• Phaeophycease haius
,Dictotales • Fan shaped parenchymous thalli
• Predominant apical cell
• Isomorphic AOG
• Reproductive structures in sori
Laminariales • Large parenchymous thalli
• Heteromorphic AOG; microthalli (1N) and macrothalli (2N)
• Intercalating meristem adds to length
• Meristoderm can split
• Tissue differentiation
• Gametophytes are filamentous
• Gametes are oogamous
• Blade splitting is important
• Sori on vegetative blades or special blades
Undaria • Invasive in many parts of the world
• Cultivated in some parts of the world
• Lots of effort made to keep it out
• Genetic markers show multiple introductions
Focales • Apical growth
• Diplontic life cycle oogamous
• Diploid plant produces gametes
Durvilleae Antartical • Focales
, • Honeycomb strnds for buoyancy
• Used to be used as bags by the maori
• Can be eaten or collected for alginate
Antarctic circumpolar current (ACC) a unidirectional current. Durvilleae travels on this
current and homogenises the variation. Sargassum is in the Sargasso sea and is also
pneumatised. It is currently undergoing a massive algal bloom due to deforestation and land
run off.
Diatoms • Photosynthetic unicells
• Have chl a and c2, and fucoxanthin
• Laminarin
• Some sperm have flagella
• Compound silica cell wall and frustule
• Large central vacuole
• Diploid- gametic meiosis
• Taxonomically, phylogenically, and ecologically diverse
• Good fossil record
Diatom silica frustules made out of two components- epitheca and hypotheca on either side
of the plasma membrane. Both of these structures have girdle bands which are glass bands that
enable growth in length.
Parmales, Bolidophyceae a sister group and shows the previously unknown development of
frustules and scales. These show the missing step in the evolutionary record of diatom
development of scales with epivalves.
Diatom types centrics or pennates
